Hallam Lake


Hallam Lake
100 Puppy Smith St.
Aspen, CO 81611






9AM – 5PM Monday-Friday.
9AM –  5PM Saturdays winter & summer.

Hallam Lake, a 25-acre nature preserve and environmental learning center, was the first location of the Aspen Center for Environmental Studies. The Hallam Lake property was donated in 1968 by Elizabeth Paepcke. The preserve is open to the public year-round and provides an inspiring setting for ACES’ many educational and naturalist programs. Borrow our binoculars and search for local wildlife. Keep your eyes out for freely roaming mule deer, elk, foxes, coyotes, bear, beavers, golden eagles, hawks, songbirds, and more!

Directions: We are located at the end of Puppy Smith Street behind the Aspen Post Office. You will reach a set of stone gates. The parking lot is on the left, and then you can walk down through the gates on the trail to the Hallam Lake Nature Center, which will be at the end of the trail on the left. Please call 970-925-5756 if you are lost!

Things to do at Hallam Lake

Activities at Hallam Lake


Friday, June 2


Egg Collection

Biweekly, Tuesdays

Tuesday, June 6


Tuesday Birding at Hallam Lake


Saturday, June 10


Hayride Farm Tours

Posts From Hallam Lake

Working together we can make a difference.

Protect our world for the future. A donation to ACES allows us to forge bold innovation in environmental science education, ecological literacy, forest health, restoration of our lands, and sustainable agriculture. We hope you will make an investment in nature today and join a community of environmental stewards!

Other Locations

Rock Bottom Ranch

Rock Bottom Ranch

Catto Center at Toklat

Catto Center at Toklat