Menu

Filters and navigation

Change location Change location
Current year

Boulder

Region stats

Sightings

Updated ~10 hr(s) ago.
Last seen First seen High counts

Observations - Last seen - Sorted by Date descending

species 1.

Sabine's Gull

Count  1
22 Sep 2023
David Waltman
Baseline Reservoir
species 2.

Common Merganser

Count  4
22 Sep 2023
Patricia Cullen
Baseline Reservoir
species 3.

Ring-billed Gull

Count  7
22 Sep 2023
Patricia Cullen
Baseline Reservoir
species 4.

Double-crested Cormorant

Count  18
22 Sep 2023
Patricia Cullen
Baseline Reservoir
species 5.

Snowy Egret

Count  1
22 Sep 2023
Patricia Cullen
Baseline Reservoir
species 6.

Eurasian Collared-Dove

Count  2
22 Sep 2023
Leanne Presley
Rock Rose
species 7.

Blue Jay

Count  3
22 Sep 2023
Leanne Presley
Rock Rose
species 8.

Black-capped Chickadee

Count  3
22 Sep 2023
Leanne Presley
Rock Rose
species 9.

Red-breasted Nuthatch

Count  3
22 Sep 2023
Leanne Presley
Rock Rose
species 10.

House Finch

Count  2
22 Sep 2023
Leanne Presley
Rock Rose
species 11.

American White Pelican

Count  4
22 Sep 2023
Cynthia Damon
Boulder Reservoir, Boulder US-CO 40.07135, -105.23184
species 12.

Pied-billed Grebe

Count  1
22 Sep 2023
John Salisbury
Baseline Reservoir
species 13.

American Coot

Count  18
22 Sep 2023
John Salisbury
Baseline Reservoir
species 14.

Turkey Vulture

Count  1
22 Sep 2023
Thomas Heinrich
Baseline Reservoir
species 15.

Bald Eagle

Count  1
22 Sep 2023
Thomas Heinrich
Baseline Reservoir
species 16.

Red-tailed Hawk

Count  3
22 Sep 2023
Thomas Heinrich
Baseline Reservoir
species 17.

Song Sparrow

Count  5
22 Sep 2023
Daisy Raymondson
Home
species 18.

Lesser Goldfinch

Count  2
22 Sep 2023
Tom Crock
Boulder Mountain Park, Boulder US-CO 40.00441, -105.30582
species 19.

Blue-winged Teal

Count  5
22 Sep 2023
Sue Riffe
Lagerman Agricultural Preserve--Swede Lakes
species 20.

Cinnamon Teal

Count  1
22 Sep 2023
Sue Riffe
Lagerman Agricultural Preserve--Swede Lakes
species 21.

American Wigeon

Count  11
22 Sep 2023
Sue Riffe
Lagerman Agricultural Preserve--Swede Lakes
species 22.

Mallard

Count  10
22 Sep 2023
Sue Riffe
Lagerman Agricultural Preserve--Swede Lakes
species 23.

Green-winged Teal

Count  2
22 Sep 2023
Sue Riffe
Lagerman Agricultural Preserve--Swede Lakes
species 24.

Rock Pigeon

Count  3
22 Sep 2023
Sue Riffe
Lagerman Agricultural Preserve--Swede Lakes
species 25.

California Gull

Count  1
22 Sep 2023
Sue Riffe
Lagerman Agricultural Preserve--Swede Lakes
species 26.

Northern Flicker

Count  3
22 Sep 2023
Sue Riffe
Lagerman Agricultural Preserve--Swede Lakes
species 27.

European Starling

Count  25
22 Sep 2023
Sue Riffe
Lagerman Agricultural Preserve--Swede Lakes
species 28.

American Goldfinch

Count  1
22 Sep 2023
Sue Riffe
Lagerman Agricultural Preserve--Swede Lakes
species 29.

Red-winged Blackbird

Count  18
22 Sep 2023
Sue Riffe
Lagerman Agricultural Preserve--Swede Lakes
species 30.

Common Grackle

Count  2
22 Sep 2023
Sue Riffe
Lagerman Agricultural Preserve--Swede Lakes
species 31.

Barn Swallow

Count  3
22 Sep 2023
Kieran Schnitzspahn
Fairview High School
species 32.

Northern Shoveler

Count  6
22 Sep 2023
Sue Riffe
Lagerman Agricultural Preserve--Lagerman Reservoir
species 33.

Gadwall

Count  2
22 Sep 2023
Sue Riffe
Lagerman Agricultural Preserve--Lagerman Reservoir
species 34.

Northern Pintail

Count  1
22 Sep 2023
Sue Riffe
Lagerman Agricultural Preserve--Lagerman Reservoir
species 35.

Ruddy Duck

Count  16
22 Sep 2023
Sue Riffe
Lagerman Agricultural Preserve--Lagerman Reservoir
species 36.

Eared Grebe

Count  3
22 Sep 2023
Sue Riffe
Lagerman Agricultural Preserve--Lagerman Reservoir
species 37.

Mourning Dove

Count  1
22 Sep 2023
Sue Riffe
Lagerman Agricultural Preserve--Lagerman Reservoir
species 38.

American Avocet

Count  2
22 Sep 2023
Sue Riffe
Lagerman Agricultural Preserve--Lagerman Reservoir
species 39.

Killdeer

Count  33
22 Sep 2023
Sue Riffe
Lagerman Agricultural Preserve--Lagerman Reservoir
species 40.

Wilson's Snipe

Count  3
22 Sep 2023
Sue Riffe
Lagerman Agricultural Preserve--Lagerman Reservoir
species 41.

Solitary Sandpiper

Count  1
22 Sep 2023
Sue Riffe
Lagerman Agricultural Preserve--Lagerman Reservoir
species 42.

Greater Yellowlegs

Count  2
22 Sep 2023
Sue Riffe
Lagerman Agricultural Preserve--Lagerman Reservoir
species 43.

Lesser Yellowlegs

Count  5
22 Sep 2023
Sue Riffe
Lagerman Agricultural Preserve--Lagerman Reservoir
species 44.

Chipping Sparrow

Count  1
22 Sep 2023
Sue Riffe
Lagerman Agricultural Preserve--Lagerman Reservoir
species 45.

Vesper Sparrow

Count  1
22 Sep 2023
Sue Riffe
Lagerman Agricultural Preserve--Lagerman Reservoir
species 46.

Savannah Sparrow

Count  2
22 Sep 2023
Sue Riffe
Lagerman Agricultural Preserve--Lagerman Reservoir
species 47.

Western Meadowlark

Count  3
22 Sep 2023
Sue Riffe
Lagerman Agricultural Preserve--Lagerman Reservoir
species 48.

Herring Gull

Count  1
22 Sep 2023
Daniel Gelbart
Baseline Reservoir
species 49.

Canada Goose

Count  10
22 Sep 2023
Dani Quarrella
Left Hand Creek at Pike Rd
species 50.

Wood Duck

Count  2
22 Sep 2023
Randall Siebert
Waneka Lake/Greenlee Preserve--Greenlee Only
species 51.

Sora

Count  1
22 Sep 2023
Randall Siebert
Waneka Lake/Greenlee Preserve--Greenlee Only
species 52.

Downy Woodpecker

Count  1
22 Sep 2023
Randall Siebert
Waneka Lake/Greenlee Preserve--Greenlee Only
species 53.

Black-billed Magpie

Count  2
22 Sep 2023
Randall Siebert
Waneka Lake/Greenlee Preserve--Greenlee Only
species 54.

White-breasted Nuthatch

Count  1
22 Sep 2023
Randall Siebert
Waneka Lake/Greenlee Preserve--Greenlee Only
species 55.

House Sparrow

Count  3
22 Sep 2023
Randall Siebert
Waneka Lake/Greenlee Preserve--Greenlee Only
species 56.

Black-chinned Hummingbird

Count  1
22 Sep 2023
Christian Nunes
Boulder Creek--75th St.
species 57.

Broad-tailed Hummingbird

Count  3
22 Sep 2023
william miller
Olde Stage Rd--Red Hill Rd to Lefthand Canyon Dr
species 58.

Belted Kingfisher

Count  1
22 Sep 2023
Christian Nunes
Boulder Creek--75th St.
species 59.

Red-naped Sapsucker

Count  1
22 Sep 2023
william miller
Olde Stage Rd--Red Hill Rd to Lefthand Canyon Dr
species 60.

Say's Phoebe

Count  1
22 Sep 2023
Christian Nunes
Boulder Creek--75th St.
species 61.

Steller's Jay

Count  6
22 Sep 2023
william miller
Olde Stage Rd--Red Hill Rd to Lefthand Canyon Dr
species 62.

American Robin

Count  1
22 Sep 2023
william miller
Olde Stage Rd--Red Hill Rd to Lefthand Canyon Dr
species 63.

Clay-colored Sparrow

Count  1
22 Sep 2023
Christian Nunes
Boulder Creek--75th St.
species 64.

Spotted Towhee

Count  2
22 Sep 2023
william miller
Olde Stage Rd--Red Hill Rd to Lefthand Canyon Dr
species 65.

Brewer's Blackbird

Count  1
22 Sep 2023
Christian Nunes
Boulder Creek--75th St.
species 66.

Common Yellowthroat

Count  1
22 Sep 2023
Christian Nunes
Boulder Creek--75th St.
species 67.

Great Blue Heron

Count  1
22 Sep 2023
art reisman
White Rocks Trail area
species 68.

Ferruginous Hawk

Count  1
22 Sep 2023
art reisman
White Rocks Trail area
species 69.

American Kestrel

Count  1
22 Sep 2023
art reisman
White Rocks Trail area
species 70.

White-crowned Sparrow

Count  2
22 Sep 2023
art reisman
White Rocks Trail area
species 71.

Orange-crowned Warbler

Count  2
22 Sep 2023
art reisman
White Rocks Trail area
species 72.

Yellow-rumped Warbler

Count  2
22 Sep 2023
art reisman
White Rocks Trail area
species 73.

Woodhouse's Scrub-Jay

Count  2
22 Sep 2023
Carrie Vaughn
Hall Ranch--South
species 74.

Clark's Nutcracker

Count  4
22 Sep 2023
Carrie Vaughn
Hall Ranch--South
species 75.

American Crow

Count  1
22 Sep 2023
Carrie Vaughn
Hall Ranch--South
species 76.

Townsend's Solitaire

Count  2
22 Sep 2023
Carrie Vaughn
Hall Ranch--South
species 77.

Dusky Flycatcher

Count  1
22 Sep 2023
Daniel Gelbart
Valmont Overlook (Legion Park)
species 78.

Swainson's Hawk

Count  1
22 Sep 2023
Randall Siebert
Waneka Lake/Greenlee Preserve--Waneka Lake only
species 79.

Common Raven

Count  2
22 Sep 2023
A J
Horsetooth Peak Trail, Allenspark, Colorado, US (40.239, -105.553)
species 80.

Mountain Chickadee

Count  1
22 Sep 2023
A J
Horsetooth Peak Trail, Allenspark, Colorado, US (40.239, -105.553)
species 81.

Red Crossbill

Count  1
22 Sep 2023
Neil Brown
Ruby's Retreat, Lyons Colorado, US (40.192, -105.488)
species 82.

Dark-eyed Junco

Count  4
22 Sep 2023
Neil Brown
Ruby's Retreat, Lyons Colorado, US (40.192, -105.488)
species 83.

Williamson's Sapsucker

Count  1
22 Sep 2023
Patrick Morgan
Reynolds Ranch (no public access)
species 84.

Hairy Woodpecker

Count  1
22 Sep 2023
Patrick Morgan
Reynolds Ranch (no public access)
species 85.

Ruby-crowned Kinglet

Count  3
22 Sep 2023
Patrick Morgan
Reynolds Ranch (no public access)
species 86.

Brown Creeper

Count  1
22 Sep 2023
Patrick Morgan
Reynolds Ranch (no public access)
species 87.

Green-tailed Towhee

Count  1
22 Sep 2023
Patrick Morgan
Reynolds Ranch (no public access)
species 88.

Gray Catbird

Count  1
22 Sep 2023
Pamela Eaton
80305, Boulder US-CO (39.9758,-105.2762)
species 89.

Cedar Waxwing

Count  2
22 Sep 2023
Pamela Eaton
80305, Boulder US-CO (39.9758,-105.2762)
species 90.

Great Egret

Count  1
22 Sep 2023
John Salisbury
Walden Ponds Wildlife Habitat--Walden & Sawhill Ponds all together
species 91.

Osprey

Count  1
22 Sep 2023
John Salisbury
Walden Ponds Wildlife Habitat--Walden & Sawhill Ponds all together
species 92.

Redhead

Count  19
22 Sep 2023
Robert King
Lagerman Agricultural Preserve--Lagerman Reservoir
species 93.

Ring-necked Duck

Count  2
22 Sep 2023
Robert King
Lagerman Agricultural Preserve--Lagerman Reservoir
species 94.

Lesser Scaup

Count  1
22 Sep 2023
Robert King
Lagerman Agricultural Preserve--Lagerman Reservoir
species 95.

Yellow-headed Blackbird

Count  1
22 Sep 2023
Robert King
Lagerman Agricultural Preserve--Lagerman Reservoir
species 96.

Cooper's Hawk

Count  1
22 Sep 2023
Eve Lempriere
Niwot Loop Trail
species 97.

Canada Jay

Count  1
22 Sep 2023
Alan Brelsford
Magnolia Road, Nederland, Colorado, US (39.961, -105.443)
species 98.

Pygmy Nuthatch

Count  4
22 Sep 2023
Alan Brelsford
Magnolia Road, Nederland, Colorado, US (39.961, -105.443)
species 99.

Hooded Merganser

Count  1
22 Sep 2023
Patricia Cullen
Lagerman Agricultural Preserve--Lagerman Reservoir
species 100.

Horned Lark

Count  2
22 Sep 2023
Patricia Cullen
Lagerman Agricultural Preserve--Lagerman Reservoir
species 101.

Brewer's Sparrow

Count  1
22 Sep 2023
Jim Ward
Hecla Lake
species 102.

Sharp-shinned Hawk

Count  1
22 Sep 2023
Thomas Heinrich
3rd & Forest
species 103.

Pinyon Jay

Count  1
22 Sep 2023
Thomas Heinrich
3rd & Forest
species 104.

House Wren

Count  2
22 Sep 2023
Thomas Heinrich
3rd & Forest
species 105.

Wilson's Warbler

Count  1
22 Sep 2023
Thomas Heinrich
3rd & Forest
species 106.

Great Horned Owl

Count  1
21 Sep 2023
Eric Walters
CO Longmont
species 107.

Tree Swallow

Count  1
21 Sep 2023
Jeffrey Price
Waneka Lake/Greenlee Preserve
species 108.

Marsh Wren

Count  1
21 Sep 2023
Jacob Hall
Boulder Creek--61st St.
species 109.

Lark Sparrow

Count  1
21 Sep 2023
Scott Dieni
Sombrero Marsh & Pond
species 110.

American Dipper

Count  1
21 Sep 2023
Scott Brown
Boulder Creek--University of Colorado campus
species 111.

Indigo Bunting

Count  1
21 Sep 2023
Richard Trinkner
Boulder Community Garden
species 112.

Golden-crowned Kinglet

Count  1
21 Sep 2023
Paraksh Vankawala
Long Lake & Lake Isabelle Trail
species 113.

Pine Grosbeak

Count  1
21 Sep 2023
Paraksh Vankawala
Long Lake & Lake Isabelle Trail
species 114.

Least Sandpiper

Count  2
21 Sep 2023
Donna Stumpp
Little Gaynor Lake
species 115.

Pectoral Sandpiper

Count  1
21 Sep 2023
Donna Stumpp
Little Gaynor Lake
species 116.

Semipalmated Sandpiper

Count  1
21 Sep 2023
Donna Stumpp
Little Gaynor Lake
species 117.

Spotted Sandpiper

Count  2
21 Sep 2023
Sue Riffe
Lagerman Agricultural Preserve--Lagerman Reservoir
species 118.

Golden Eagle

Count  1
21 Sep 2023
Sue Riffe
Lagerman Agricultural Preserve--Lagerman Reservoir
species 119.

Blue-gray Gnatcatcher

Count  1
21 Sep 2023
Norman Erthal
Hawthorn Gulch
species 120.

Blue Grosbeak

Count  1
21 Sep 2023
Tom Crock
Walden Ponds Wildlife Habitat--Cottonwood Marsh/Wally Tove's Pond/Duck Pond
species 121.

Wild Turkey

Count  4
21 Sep 2023
Kevin Rutherford
Old Saint Vrain Rd
species 122.

Canyon Wren

Count  1
21 Sep 2023
Kevin Rutherford
Old Saint Vrain Rd
species 123.

Lincoln's Sparrow

Count  2
21 Sep 2023
Kevin Rutherford
Old Saint Vrain Rd
species 124.

Sage Thrasher

Count  1
21 Sep 2023
Charles Hundertmark
Heil Ranch--Picture Rock Trail
species 125.

Cassin's Kingbird

Count  1
21 Sep 2023
Thomas Heinrich
3rd & Forest
species 126.

Black-headed Grosbeak

Count  1
21 Sep 2023
Thomas Heinrich
3rd & Forest
species 127.

Peregrine Falcon

Count  1
21 Sep 2023
Jim Ward
White Rocks Trail area
species 128.

Chimney Swift

Count  1
21 Sep 2023
John Salisbury
Pella Crossing Open Space
species 129.

Black-crowned Night-Heron

Count  1
21 Sep 2023
Todd Dowling
Walden Ponds Wildlife Habitat--Walden & Sawhill Ponds all together
species 130.

Brown Thrasher

Count  1
21 Sep 2023
Todd Dowling
Walden Ponds Wildlife Habitat--Walden & Sawhill Ponds all together
species 131.

Western Tanager

Count  1
21 Sep 2023
Todd Dowling
Walden Ponds Wildlife Habitat--Walden & Sawhill Ponds all together
species 132.

Western Wood-Pewee

Count  1
20 Sep 2023
Ernest Crvich
Pleasant View Marsh
species 133.

Common Poorwill

Count  1
20 Sep 2023
Sue Riffe
96 Antelope Dr, Lyons (Boulder Cty, CO)
species 134.

Lazuli Bunting

Count  3
20 Sep 2023
Sue Riffe
96 Antelope Dr, Lyons (Boulder Cty, CO)
species 135.

Pine Siskin

Count  6
20 Sep 2023
Pamela S
Riverside
species 136.

Bushtit

Count  1
20 Sep 2023
Benjamin Brown-Steiner
Hayden Lake
species 137.

Prairie Falcon

Count  1
20 Sep 2023
art reisman
Mayhoffer Singletree Trail
species 138.

Cassin's Finch

Count  5
20 Sep 2023
Neil Brown
Roosevelt NF - Taylor Mountain Area
species 139.

Horned Grebe

Count  2
20 Sep 2023
Nancy Ries Morrison
Lagerman Agricultural Preserve--Lagerman Reservoir
species 140.

White-faced Ibis

Count  1
20 Sep 2023
Nancy Ries Morrison
Lagerman Agricultural Preserve--Lagerman Reservoir
species 141.

American Pipit

Count  1
20 Sep 2023
Joo Tan
Heil Valley Ranch
species 142.

Canvasback

Count  2
20 Sep 2023
Jason Barcus
Lagerman Agricultural Preserve--Lagerman Reservoir
species 143.

Bufflehead

Count  2
20 Sep 2023
Jason Barcus
Lagerman Agricultural Preserve--Lagerman Reservoir
species 144.

Common Goldeneye

Count  1
20 Sep 2023
Jason Barcus
Lagerman Agricultural Preserve--Lagerman Reservoir
species 145.

Lark Bunting

Count  1
20 Sep 2023
Jason Barcus
Lagerman Agricultural Preserve--Lagerman Reservoir
species 146.

Plumbeous Vireo

Count  2
19 Sep 2023
Christian Nunes
Eldorado Mountain Open Space--Goshawk Ridge Trail
species 147.

Rufous Hummingbird

Count  1
19 Sep 2023
David Waltman
Crestview 8464 W Fork Rd (private residence)
species 148.

Yellow Warbler

Count  1
19 Sep 2023
Darcy Juday
Pella Crossing Open Space
species 149.

Broad-winged Hawk

Count  1
19 Sep 2023
Thomas Heinrich
Pleasant View Marsh
species 150.

Stilt Sandpiper

Count  1
19 Sep 2023
Valentina Roumi
Little Gaynor Lake
species 151.

Wilson's Phalarope

Count  2
19 Sep 2023
Valentina Roumi
Little Gaynor Lake
species 152.

Western Grebe

Count  15
19 Sep 2023
Thomas Heinrich
Boulder Reservoir complex--Boulder Reservoir
species 153.

Brown-headed Cowbird

Count  1
19 Sep 2023
Jason Barcus
Walden Ponds Wildlife Habitat--Walden & Sawhill Ponds all together
species 154.

Virginia Rail

Count  1
19 Sep 2023
Jim Ward
Walden Ponds Wildlife Habitat--Walden & Sawhill Ponds all together
species 155.

Warbling Vireo

Count  1
18 Sep 2023
Van Rudd
Green Mountain West Ridge Trail
species 156.

Northern Harrier

Count  1
18 Sep 2023
Valentina Roumi
South 66th St
species 157.

Green Heron

Count  1
18 Sep 2023
Pamela S
Walden Ponds Wildlife Habitat--Walden & Sawhill Ponds all together
species 158.

Rock Wren

Count  2
18 Sep 2023
Valentina Roumi
National Center for Atmospheric Research Mesa
species 159.

Evening Grosbeak

Count  1
18 Sep 2023
Donna Sichko
White Rocks Trail area
species 160.

Common Nighthawk

Count  1
17 Sep 2023
Bryan Guarente
1821 18th Ave
species 161.

Western Kingbird

Count  2
17 Sep 2023
Catherine Labio
South Boulder Creek Trail West
species 162.

Baird's Sandpiper

Count  1
17 Sep 2023
Rhianna Truex
Lagerman Agricultural Preserve--Lagerman Reservoir
species 163.

Band-tailed Pigeon

Count  2
17 Sep 2023
Robin Allison
124 Ski Road
species 164.

Northern Mockingbird

Count  1
17 Sep 2023
Gilbert Bouchard
East Boulder Trail--Teller Lakes
species 165.

Eastern Kingbird

Count  1
17 Sep 2023
Phil Thorpe
Mesa Reservoir
species 166.

Violet-green Swallow

Count  4
17 Sep 2023
carl starace
Walden Ponds Wildlife Habitat--Cottonwood Marsh/Wally Tove's Pond/Duck Pond
species 167.

American Three-toed Woodpecker

Count  1
17 Sep 2023
David Dowell
Niwot Ridge Road
species 168.

Mountain Bluebird

Count  3
17 Sep 2023
David Dowell
Niwot Ridge Road
species 169.

Swainson's Thrush

Count  2
17 Sep 2023
David Dowell
Niwot Ridge Road
species 170.

Lewis's Woodpecker

Count  1
17 Sep 2023
Thomas Heinrich
3rd & Forest
species 171.

Willet

Count  2
17 Sep 2023
Jay Hutchins
Lagerman Agricultural Preserve--Lagerman Reservoir
species 172.

White-throated Swift

Count  25
16 Sep 2023
Alyssa Hemler
Eldorado Mountain Open Space--Fowler Trail
species 173.

Hammond's Flycatcher

Count  2
16 Sep 2023
Bruce Raup
South Boulder Creek West Trail, Midway Up, Boulder, Colorado, US (39.946, -105.26)
species 174.

Eastern Phoebe

Count  2
16 Sep 2023
Jane Baryames
Walden Ponds Wildlife Habitat--Walden & Sawhill Ponds all together
species 175.

Western Bluebird

Count  2
15 Sep 2023
Noah Brinkman
National Center for Atmospheric Research Mesa
species 176.

Townsend's Warbler

Count  1
15 Sep 2023
sarah walker
Mud Lake Open Space
species 177.

Yellow-bellied Sapsucker

Count  1
15 Sep 2023
Christian Nunes
Greenbelt Plateau
species 178.

Gray Flycatcher

Count  1
15 Sep 2023
Christian Nunes
Greenbelt Plateau
species 179.

MacGillivray's Warbler

Count  1
15 Sep 2023
Christian Nunes
Greenbelt Plateau
species 180.

Hermit Thrush

Count  1
15 Sep 2023
David Duey
659 Coyote Hill Rd, Allenspark US-CO 40.24847, -105.51147
species 181.

Northern Waterthrush

Count  1
15 Sep 2023
Joo Tan
Boulder Reservoir complex--Coot Lake
species 182.

American Bittern

Count  1
14 Sep 2023
Valentina Roumi
Boulder Reservoir complex--Boulder Reservoir
species 183.

Dusky Grouse

Count  1
14 Sep 2023
Harold Eyster
Green Mountain West Ridge Trail
species 184.

Calliope Hummingbird

Count  1
13 Sep 2023
David Waltman
Crestview Estates
species 185.

Olive-sided Flycatcher

Count  1
13 Sep 2023
Richard Klassen 🦢
Lagerman Agricultural Preserve--Lagerman Reservoir
species 186.

Merlin

Count  1
13 Sep 2023
Peter Burke
Lagerman Agricultural Preserve--Lagerman Reservoir
species 187.

Cassin's Vireo

Count  2
13 Sep 2023
David Duey
Mountain time loop
species 188.

Virginia's Warbler

Count  1
12 Sep 2023
Carl Bendorf
Old Saint Vrain Rd
species 189.

Willow Flycatcher

Count  1
12 Sep 2023
Norman Erthal
Walden Ponds Wildlife Habitat--Walden & Sawhill Ponds all together
species 190.

Cliff Swallow

Count  5
12 Sep 2023
Jeremy Alcorn
Old Saint Vrain Rd
species 191.

Nashville Warbler

Count  1
12 Sep 2023
Randall Siebert
White Rocks Trail area
species 192.

Loggerhead Shrike

Count  1
11 Sep 2023
Eric Boysen
Boulder Open Space--Beech Trail
species 193.

American Redstart

Count  1
11 Sep 2023
Rhianna Truex
Mountain View Cemetery (Boulder Co.)
species 194.

Yellow-breasted Chat

Count  2
11 Sep 2023
Jason Barcus
Rabbit Mountain
species 195.

Bobolink

Count  1
10 Sep 2023
Christian Nunes
Burch Lake
species 196.

Northern Goshawk

Count  1
10 Sep 2023
Paul Slingsby
Heil Valley Ranch
species 197.

Red-necked Phalarope

Count  2
10 Sep 2023
Donna Stumpp
Little Gaynor Lake
species 198.

Black Tern

Count  7
9 Sep 2023
Kasper Moeller
McIntosh Lake
species 199.

Eastern Screech-Owl

Count  1
7 Sep 2023
Karen Coupland
Home - Harvest Junction Village in Longmont
species 200.

Franklin's Gull

Count  1
7 Sep 2023
Kieran Schnitzspahn
Boulder Rock Club
species 201.

Bullock's Oriole

Count  2
7 Sep 2023
Chris Petrizzo
Walden Ponds Wildlife Habitat--Cottonwood Marsh/Wally Tove's Pond/Duck Pond
species 202.

Sandhill Crane

Count  2
6 Sep 2023
Valentina Roumi
Little Gaynor Lake
species 203.

Northern Rough-winged Swallow

Count  1
6 Sep 2023
Bryan White
Little Gaynor Lake
species 204.

White-tailed Ptarmigan

Count  5
6 Sep 2023
Thomas Heinrich
Mount Audubon Trail
species 205.

Barn Owl

Count  1
5 Sep 2023
Ted Floyd
Waneka Lake/Greenlee Preserve
species 206.

Caspian Tern

Count  2
5 Sep 2023
Bryan White
Boulder Reservoir complex--Boulder Reservoir
species 207.

Black-necked Stilt

Count  3
5 Sep 2023
John Rutenbeck
Little Gaynor Lake
species 208.

Cordilleran Flycatcher

Count  1
5 Sep 2023
Jason Barcus
Old Saint Vrain Rd
species 209.

Red-eyed Vireo

Count  1
4 Sep 2023
Michael Patterson
ACNP (Private, Restricted Access)
species 210.

Long-billed Curlew

Count  5
3 Sep 2023
Greg Vassilopoulos
Lagerman Agricultural Preserve--Lagerman Reservoir
species 211.

Western Sandpiper

Count  2
3 Sep 2023
Susan Downey
Lagerman Agricultural Preserve--Lagerman Reservoir
species 212.

Great-tailed Grackle

Count  3
2 Sep 2023
Patricia Cullen
Jim Hamm Nature Area
species 213.

Semipalmated Plover

Count  1
2 Sep 2023
Candice Johnson
Lagerman Agricultural Preserve--Lagerman Reservoir
species 214.

Fox Sparrow

Count  1
2 Sep 2023
David Duey
Mountain time loop
species 215.

Long-billed Dowitcher

Count  1
2 Sep 2023
Jane Baryames
White Rocks Trail area
species 216.

Brown-capped Rosy-Finch

Count  6
31 Aug 2023
Jonathan Montgomery
Mount Audubon Trail
species 217.

Bank Swallow

Count  1
29 Aug 2023
Kieran Schnitzspahn
Fairview High School
species 218.

Clark's Grebe

Count  7
26 Aug 2023
Laurel Barnhill
Terry Lake
species 219.

Least Flycatcher

Count  1
26 Aug 2023
Benjamin Antieau
Flatirons Vista Trail
species 220.

Black-bellied Plover

Count  1
25 Aug 2023
Valentina Roumi
Lagerman Agricultural Preserve--Lagerman Reservoir
species 221.

Red-headed Woodpecker

Count  1
25 Aug 2023
Eileen Rutherford
31265 7, Lyons, Colorado, US (40.207, -105.293)
species 222.

Flammulated Owl

Count  1
20 Aug 2023
Kieran Schnitzspahn
Home
species 223.

Black Swift

Count  1
20 Aug 2023
Sol Charlton
Summer Hawk drive area park
species 224.

Grasshopper Sparrow

Count  1
17 Aug 2023
Steve Harder
Eldorado Mountain Open Space--Spring Brook Loop
species 225.

Orchard Oriole

Count  2
17 Aug 2023
Pamela S
White Rocks Trail area
species 226.

Upland Sandpiper

Count  1
16 Aug 2023
Tracy Pheneger 🪺
Lagerman Agricultural Preserve--Lagerman Reservoir
species 227.

White-winged Crossbill

Count  2
14 Aug 2023
Cole Wild
Beaver Reservoir and Trailhead
species 228.

Marbled Godwit

Count  1
13 Aug 2023
Teresa buowgirl
Lagerman Agricultural Preserve--Lagerman Reservoir
species 229.

Northern Parula

Count  1
11 Aug 2023
Ron Bolton
Old Saint Vrain Rd
species 230.

Northern Pygmy-Owl

Count  1
8 Aug 2023
Alan Brelsford
Magnolia Road, Nederland, Colorado, US (39.961, -105.443)
species 231.

Dickcissel

Count  1
8 Aug 2023
Sandra Hardy Reigel
East Boulder Trail--Teller Lakes
species 232.

Winter Wren

Count  1
7 Aug 2023
Leslie S
Twin Lakes (Boulder County)
species 233.

Northern Saw-whet Owl

Count  1
6 Aug 2023
Chris Chappell
Rocky Mountain Ecodharma Retreat Center
species 234.

Cattle Egret

Count  1
5 Aug 2023
Alexander Brown
Little Gaynor Lake
species 235.

Ovenbird

Count  1
2 Aug 2023
Carl Bendorf
Old Saint Vrain Rd
species 236.

Northern Cardinal

Count  1
22 Jul 2023
Richard Trinkner
Boulder
species 237.

Limpkin

Count  1
20 Jul 2023
Ryan Dibala
East Boulder Trail--Teller Lakes
species 238.

Boreal Owl

Count  1
17 Jul 2023
Will Anderson
CU Mountain Research Station
species 239.

Greater White-fronted Goose

Count  1
13 Jul 2023
John Bryan
McIntosh Lake
species 240.

White-winged Dove

Count  1
6 Jul 2023
Susan McClellan
Unit B
species 241.

Yellow-billed Cuckoo

Count  1
3 Jul 2023
josh Ketry
Gregory Canyon
species 242.

Rose-breasted Grosbeak

Count  1
24 Jun 2023
Susan Hofacker
McClintock Trail
species 243.

Eastern Bluebird

Count  1
23 Jun 2023
Winston Liu
Betasso Preserve
species 244.

Black-bellied Whistling-Duck

Count  7
20 Jun 2023
Kyle Carlsen
Pella Crossing Open Space
species 245.

Baltimore Oriole

Count  1
26 May 2023
Eric DeFonso 🦑
East Boulder Trail--Teller Lakes
species 246.

Chestnut-sided Warbler

Count  1
25 May 2023
Andy Knolla
Marshall Marsh
species 247.

Black-throated Green Warbler

Count  1
24 May 2023
Michael Morton
Skunk Canyon Trails
species 248.

Blue-winged Warbler

Count  1
21 May 2023
Peter Gent
Gregory Canyon
species 249.

Sanderling

Count  1
20 May 2023
Jeremy Alcorn
Little Gaynor Lake
species 250.

Forster's Tern

Count  1
20 May 2023
Stephen Chang
Stearns Lake
species 251.

Short-billed Dowitcher

Count  1
20 May 2023
James Campbell
Stearns Lake
species 252.

Summer Tanager

Count  1
20 May 2023
Emily Ringoen
Golden Ponds Park and Nature Area
species 253.

Philadelphia Vireo

Count  1
20 May 2023
matt nipper
University of Colorado campus--Confluence Ponds and Skunk Creek
species 254.

White-throated Sparrow

Count  1
16 May 2023
Jeff Percell
KOA Lake
species 255.

Yellow-throated Vireo

Count  1
16 May 2023
Deb Piranian
University of Colorado campus--Confluence Ponds and Skunk Creek
species 256.

Palm Warbler

Count  1
16 May 2023
Kathryn Kay
University of Colorado campus--Confluence Ponds and Skunk Creek
species 257.

Black-and-white Warbler

Count  1
16 May 2023
willem van vliet-
University of Colorado campus--Confluence Ponds and Skunk Creek
species 258.

Hooded Warbler

Count  1
16 May 2023
willem van vliet-
University of Colorado campus--Confluence Ponds and Skunk Creek
species 259.

Black-throated Gray Warbler

Count  1
16 May 2023
willem van vliet-
University of Colorado campus--Confluence Ponds and Skunk Creek
species 260.

Tennessee Warbler

Count  1
16 May 2023
Cole Wild
Ish Reservoir (Larimer/Boulder cos.)
species 261.

Blackpoll Warbler

Count  1
15 May 2023
Rob Cassady
North Open Space
species 262.

Harris's Sparrow

Count  1
15 May 2023
John Bryan
Hall Ranch--South
species 263.

Ash-throated Flycatcher

Count  1
13 May 2023
Chris Pagliaro
My home
species 264.

Cape May Warbler

Count  1
12 May 2023
Steven Mlodinow
Longmont, Peregrine Circle
species 265.

White-eyed Vireo

Count  1
12 May 2023
Stephen Chang
Golden Ponds Park and Nature Area
species 266.

Yellow-throated Warbler

Count  1
11 May 2023
Thomas Heinrich
3rd & Forest
species 267.

Greater Scaup

Count  1
11 May 2023
Christian Nunes
Lagerman Agricultural Preserve--Lagerman Reservoir
species 268.

Mississippi Kite

Count  1
9 May 2023
Christian Nunes
Home Faith Court
species 269.

Red-breasted Merganser

Count  1
9 May 2023
Richard Trinkner
Boulder Community Garden
species 270.

Yellow-crowned Night-Heron

Count  1
7 May 2023
Christian Nunes
Golden Ponds Park and Nature Area
species 271.

Whimbrel

Count  2
6 May 2023
Richard Chant
Walden Ponds
species 272.

Trumpeter Swan

Count  1
3 May 2023
Patricia Cullen
6835 Hygiene Rd, Longmont US-CO 40.18883, -105.19406
species 273.

Prairie Warbler

Count  1
3 May 2023
Peter Gent
Lykins Gulch
species 274.

Bonaparte's Gull

Count  1
2 May 2023
Patrick Morgan
Lagerman Agricultural Preserve--Lagerman Reservoir
species 275.

American Tree Sparrow

Count  1
2 May 2023
Chris Petrizzo
Teller Lakes South
species 276.

Common Loon

Count  2
1 May 2023
Tim Smart
Valmont Overlook (Legion Park)
species 277.

Golden-crowned Sparrow

Count  1
30 Apr 2023
Catherine Labio
Marshall Marsh
species 278.

Eastern Meadowlark

Count  2
30 Apr 2023
Dan Zmolek
Walden Ponds Wildlife Habitat--Walden & Sawhill Ponds all together
species 279.

Red-bellied Woodpecker

Count  1
30 Apr 2023
Chris Petrizzo
Walden Ponds Wildlife Habitat--Cottonwood Marsh/Wally Tove's Pond/Duck Pond
species 280.

Glossy Ibis

Count  1
27 Apr 2023
Jeff Percell
East Boulder Trail--Teller Lakes
species 281.

Snow Goose

Count  1
27 Apr 2023
Laura Salter
Walden Ponds Wildlife Habitat--Walden & Sawhill Ponds all together
species 282.

Black Phoebe

Count  1
22 Apr 2023
Laura Steadman
University of Colorado Boulder--South Campus
species 283.

Cackling Goose

Count  1
21 Apr 2023
Hunter Johnson
Viele Park
species 284.

Curve-billed Thrasher

Count  1
18 Apr 2023
Cole Wild
Gunbarrel Hill
species 285.

Mexican Duck

Count  1
18 Apr 2023
Eric DeFonso 🦑
Stearns Lake
species 286.

Bohemian Waxwing

Count  2
18 Apr 2023
Ernest Crvich
Pleasant View Marsh
species 287.

Sagebrush Sparrow

Count  1
16 Apr 2023
Dan Zmolek
Mesa Reservoir
species 288.

Barrow's Goldeneye

Count  1
11 Apr 2023
Joe Marino
University of Colorado Boulder, Boulder US-CO (40.0134,-105.2455)
species 289.

Black-throated Sparrow

Count  1
7 Apr 2023
Ellen Harris
248 Old South Saint Vrain Rd, Lyons US-CO 40.21367, -105.27478
species 290.

Rough-legged Hawk

Count  1
4 Apr 2023
Karen Coupland
Road to Rabbit Mountain
species 291.

Ross's Goose

Count  1
3 Apr 2023
Grant Wiest
Stearns Lake
species 292.

Northern Shrike

Count  1
3 Apr 2023
Jeff Yegian
Walden Ponds Wildlife Habitat--Walden & Sawhill Ponds all together
species 293.

Swamp Sparrow

Count  1
28 Mar 2023
Eric DeFonso 🦑
Stearns Lake
species 294.

Short-eared Owl

Count  1
27 Mar 2023
Nick Moore
Lagerman Agricultural Preserve--Lagerman Reservoir
species 295.

Varied Thrush

Count  1
22 Mar 2023
Valentina Roumi
1405 Wildwood Lane, Boulder, Colorado, US (39.975, -105.266)
species 296.

Long-tailed Duck

Count  1
15 Mar 2023
Scott Brown
Lagerman Agricultural Preserve--Swede Lakes
species 297.

Lesser Black-backed Gull

Count  1
12 Mar 2023
Kevin Smith
Walden Ponds Wildlife Habitat--Walden & Sawhill Ponds all together
species 298.

Gray-crowned Rosy-Finch

Count  7
5 Mar 2023
Harold Eyster
Brainard Lake
species 299.

Iceland Gull

Count  1
4 Mar 2023
Alexander Brown
Baseline Reservoir
species 300.

Rusty Blackbird

Count  1
27 Feb 2023
Jeff Yegian
Waneka Lake/Greenlee Preserve
species 301.

Black Rosy-Finch

Count  4
19 Feb 2023
Genie Burch
Eagle Peak homesite
species 302.

Tundra Swan

Count  1
1 Feb 2023