
Upcoming Events

Pella Crossing with Carl Starace
Observe birds at Pella Crossing with local birder Carl Starace.
Photo of Osprey by Kevin Smith.

Lafayette Birds! First Sunday Bird Watching
Discover the fun of observing birds and other natural wonders with knowledgeable Lafayette bird watchers.
Photo credit: Lark Sparrow by Kevin Smith.

Old St. Vrain Road with Carl Starace
Picture Rock Trailhead, Heil Valley Ranch, Red Gulch Road, Lyons, CO (map)
Observe early summer birds along Old St. Vrain Road with local birder Carl Starace.
Photo credit: Gray Catbird by Kevin Smith.

World Migratory Bird Day 2025
The WMBD 2025 theme is “Shared Spaces: Creating Bird-Friendly Cities and Communities” highlighting the need for a healthy coexistence between humans and birds.

Sandstone Ranch with Carl Starace
Sandstone Ranch Community Park and Nature Area, Sandstone Drive, Longmont (map)
Observe birds at Sandstone Ranch with local birder Carl Starace.
Photo credit: Blue Grosbeak by Kevin Smith.

Lafayette Birds! First Sunday Bird Watching
Discover the fun of observing birds and other natural wonders with knowledgeable Lafayette bird watchers.
Photo credit: Tree Swallow by Gerhard Assenmacher..

Heil Valley Ranch with Carl Starace
Observe birds in the foothills at Heil Valley Ranch with local birder Carl Starace.
Photo credit: Western Flycatcher by Kevin Smith.

White Rocks Trail with Carl Starace
Teller Farm North Trailhead (map)
Observe a variety of birds along the White Rocks trail with local birder Carl Starace.
Photo credit:Bullock’s Oriole by Kevin Smith.

Lafayette Birds! First Sunday Bird Watching
Discover the fun of observing birds and other natural wonders with knowledgeable Lafayette bird watchers.
Photo credit: Western Grebe, by Kevin Smith.

Lafayette Birds! First Sunday Bird Watching
Discover the fun of observing birds and other natural wonders with knowledgeable Lafayette bird watchers.
Photo credit: Spotted Sandpiper by Gerhard Assenmacher..

What the Duck?
Hecla Lake, Louisville (map)
Observe waterfowl and other birds during spring migration on this easy guided walk with Kyle Kramer.
Photo credit: Mallard by Gerhard Assenmacher.

Birding for All Levels at Walden Ponds
Join new BCAS field trip leader Daniel Carrier for a relaxed morning of birding at Walden Ponds Wildlife Habitat.
Photo credit: Tree Swallow by Gerhard Assenmacher.

White Rocks Trail with Carl Starace
Teller Farm North Trailhead (map)
Observe a variety of returning migrants and resident birds along the White Rocks trail with local birder Carl Starace.
Photo credit: Northern House Wren by Kevin Smith.

Boulder Birds and Brew: Waneka Lake Park and Liquid Mechanics Brewing Co. in Lafayette
NOTE: This trip is full but you can join the waitlist.
Join trip leader Jim Fischer to observe spring birds at Waneka Lake Park, followed by brews and appetizers at Liquid Mechanics Brewing Co.
Photo credit: Green-winged Teal pair, by Kevin Smith.

Lafayette Birds! First Sunday Bird Watching
Discover the fun of observing birds and other natural wonders with knowledgeable Lafayette bird watchers.
Photo credit: Belted Kingfisher, multiple photographers credited at the bottom of the BCAS Regional Birds photo gallery webpage.

What the Duck?
Hecla Lake, Louisville (map)
Observe waterfowl at the start of spring migration on this easy guided walk with Kyle Kramer.
Photo credit: Mallard by Gerhard Assenmacher.

Lafayette Birds! First Sunday Bird Watching
Discover the fun of observing birds and other natural wonders with knowledgeable Lafayette bird watchers.
Photo credit: American Tree Sparrow by Kevin Smith..

Lafayette Birds! First Sunday Bird Watching
Discover the fun of observing birds and other natural wonders with knowledgeable Lafayette bird watchers.
Photo credit: Snow Goose, multiple photographers credited at the bottom of the BCAS Regional Birds photo gallery webpage.

Boulder Birds & Brew: Walden Ponds Wildlife Habitat and Wild Provisions Beer Project
Walden Ponds Wildlife Habitat (map)
NOTE: This trip is full, but you can join the waitlist.
Explore Walden Ponds Wildlife Habitat with birder Jim Fischer, followed by beers at Wild Provisions Beer Project.
Photo credit: Bald Eagle, multiple photographers credited at the bottom of the BCAS Regional Birds photo gallery webpage.

Teen Naturalists: Winter Duck Extravaganza
Thanks to the generous releases of warm suds from the Coors Brewing factory, Clear Creek below Golden does not freeze over in winter. Hooded Mergansers, goldeneyes, shovelers, and other wild ducks gather close to the public trail, allowing for unusually close viewing.

Lafayette Birds! First Sunday Bird Watching
Discover the fun of observing birds and other natural wonders with knowledgeable Lafayette bird watchers.
Photo credit: American Coot, multiple photographers credited at the bottom of the BCAS Regional Birds photo gallery webpage.

Parade of Planets: Telescope Program
NOTE: THIS PROGRAM HAS BEEN CANCELLED DUE TO AN UNFAVORABLE WEATHER FORECAST FOR ALL THREE NIGHTS.
Enjoy stunning viewing of planets, galaxies, star clusters, and nebulae with community naturalist Dave Sutherland..
NOTE: This program will be offered JUST ONCE on Dec 27, 28, or 29 - the night with the best weather forecast.
Image of Jupiter from NASA’s Hubble Space Telescope.

Owl Moon
Sawhill Ponds Trailhead (Map)
Explore the mysterious world of the Great Horned Owl under the full Owl moon, with community naturalist Dave Sutherland.
Photo by Dave Sutherland.

Teen Naturalists: Boulder Christmas Bird Count
We will spend a half-day walking through the forest, contributing our discoveries to North America's oldest published bird count.

Boulder Christmas Bird Count
Participate in the Christmas Bird Count, at various locations in the city of Boulder and surrounding areas..
NOTE: Actual field times will vary by area/leader.
Photo courtesy of Camilla Cerea/Audubon.

Boulder Birds & Brew: Board Games at Wild Provisions Beer Project
NOTE: This event is full, but you can join the waitlist.
Play WIngspan and The Great North American Bird Watching Trivia game while enjoying brews and appetizers.
Wingspan game photo from Stonemeier Games.

Lafayette Birds! First Sunday Bird Watching
Discover the fun of observing birds and other natural wonders with knowledgeable Lafayette bird watchers.
Photo credit: American Coot, multiple photographers credited at the bottom of the BCAS Regional Birds photo gallery webpage.

Meet the Planets: Music and Telescopes
View Jupiter's moons and Saturn's rings and sample Boulder Philharmonic's music, with community naturalist Dave Sutherland..
Image of Jupiter from NASA’s Hubble Space Telescope.

Crane Hollow Road with Carl Starace
Bird along Crane Hollow Road with local birder Carl Starace to look for wintering waterfowl and passerines.
Photo of American Tree Sparrow by Kevin Smith..

Teen Naturalists: Winter Raptor Survey at White Rocks (Updated Location)
Survey for raptors at Lagerman Reservoir.

Pella Crossing with Carl Starace
Bird the ponds and surrounding habitats of Pella Crossing with Carl Starace to look for waterfowl and passerines.
Photo credit: male Mallard in flight; multiple photographers credited at the bottom of the BCAS Regional Birds photo gallery webpage.

Lafayette Birds! First Sunday Bird Watching
Discover the fun of observing birds and other natural wonders with knowledgeable Lafayette bird watchers.
Photo credit: Black-billed Magpie, multiple photographers credited at the bottom of the BCAS Regional Birds photo gallery webpage.

Meet the Planets: Music and Telescopes
View Jupiter's moons and Saturn's rings and sample Boulder Philharmonic's music, with community naturalist Dave Sutherland and composer John Heins.
Image of Jupiter by Dave Sutherland.

Skullduggery!
Experience mammal skulls up close with community naturalist Dave Sutherland and mammalogist Carron Meaney.
Photo of prairie dog skull by Ann Duncan..

Meet the Planets: Music and Telescopes
View Jupiter's moons and Saturn's rings and sample Boulder Philharmonic's music, with community naturalist Dave Sutherland and composer John Heins.
Image of Saturn by Dave Sutherland.

Sandstone Ranch with Carl Starace
Sandstone Ranch Community Park and Nature Area, Sandstone Drive, Longmont (map)
Observe birds at Sandstone Ranch with local birder Carl Starace.
Photo credit: Bushtit, multiple photographers credited at the bottom of the BCAS Regional Birds photo gallery webpage.

Teen Naturalists: Migratory mammals and birds of Meyers Gulch
We will walk through peaceful woods and meadows, looking for signs of moose and elk, along with flocks of forest birds, including wild turkeys, nuthatches, woodpeckers, bluebirds, and crossbills.

Boulder Birds & Brew: Golden Ponds and Fritz Family Brewers
NOTE: This trip is full, but you can join the waitlist.
Explore Golden Ponds Nature Area with birder and wildlife biologist Megan Jones Patterson.
Photo credit: White-breasted Nuthatch, multiple photographers credited at the bottom of the BCAS Regional Birds photo gallery webpage.

White Rocks with Carl Starace
Bird the White Rocks Nature Preserve with Carl Starace to look for waterfowl and passerines.
Photo credit: Green-winged Teal pair, multiple photographers credited at the bottom of the BCAS Regional Birds photo gallery webpage.

Lafayette Birds! First Sunday Bird Watching
Discover the fun of observing birds and other natural wonders with knowledgeable Lafayette bird watchers.
Photo credit: Spotted Sandpiper, multiple photographers credited at the bottom of the BCAS Regional Birds photo gallery webpage.