ACES | Aspen Center for Environmental Studies

Kick off summer with ACES' annual Picnic on the Preserve Membership Dinner!

Don't miss our "Fire in the Belly" live storytelling event on June 6th!

Interested in adventuring with ACES this summer? Register now!

Tickets on sale now for our summer benefit, An Evening on the Lake!

Visit Rock Bottom Ranch on Mon-Sat at 11AM to meet our farm animals!

Join us for Morning Birding on the first Tuesday of every month!

Explore the night sky with ACES at free, year-round Astronomy events for all ages.

Our Mission

ACES' mission
is educating for
environmental responsibility.

Bear Swimming at Hallam Lake

Hallam Lake, 25-acre nature preserve and visitor center, has a wide diversity of wildlife. This video, captured by our trail cams, features a black bear taking a swim in Hallam Lake.

ACES BLOG

Morning Birding Species List | May 1, 2018

Tuesday, May 1, 2018, 7AM - 10AMWeather: Mostly sunnyLocation: Hallam Lake and Aspen Grove Cemetery

Calendar

June

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Fire in the Belly: Stories of Change

The Community Office for Resource Efficiency (CORE), in partnership with Aspen Center for Environmental Studies, the City of Aspen and... more

Our Mission

Featured Video

Bear Swimming at Hallam Lake

ACES BLOG

Morning Birding Species List | May 1, 2018

Calendar