Every other Tuesday, varying times
Visit our locations:
The evening version of our Green World Day Hike, this Naturalist guided adventure will explore the majesty of the Castle Creek valley at sunset.
Advance registration is required.
Join ACES Director of Naturalist Programs, Jim Kravitz on this rare opportunity to discover the far side of the North Star Preserve, which is otherwise closed to the public.
Aspen Center for Environmental Studies invites you to the top of Aspen Mountain for our annual Stars Above Aspen Astronomy Night on Thursday, August 4 from 6:00-10:30pm.