City of Aspen Open Space Birding

Offered in partnership with City of Aspen Open Space & Trails.

Marolt Open Space- August 24, 2026: Pockets of fall migration bird activity are exciting to find in the open landscape of the Marolt Open Space, where clusters of native shrubs in perimeter areas and stands of trees provide excellent foraging and cover. Join ACES for a morning field trip to explore this special area that is a hotspot for mixed flocks of migrating songbirds as well as a National Historic Register site. Target birds for this outing include various warbler and sparrow species, tanagers, vireos, goldfinches, orioles, bluebirds, and more. Species occasionally seen on this trip include uncommon fall migrants such as rufous hummingbird, Cassin’s vireo, and clay-colored sparrow. You will get some practice with field marks of both adult and immature plumages.

*These outings will take place on terrain that is rugged in spots, including walking on and around rocks and tree roots, and on short steep sections. Trail surfaces will be natural soil, and rocky, uneven ground as well as grass and asphalt.

This outing requires advance registration to ensure appropriate planning for the field experience. Participants must register by 5pm on the day prior to the outing.

The meeting location will be communicated to registered participants.