Aspen Center for Environmental Studies

The Aspen Center for Environmental Studies (ACES) is a 22-acre (10-hectare) wildlife sanctuary that hugs the Roaring Fork River. With a mission to advance 'the ethic that the earth must be respected and nurtured,' the Center's naturalists provide summertime guided walks, eagle demonstrations and special programs for youngsters at the top of Aspen Mountain and mid-mountain on Snowmass.

Guided walks on Snowmass depart daily at 10am. In the winter, snowshoe and ski tours are available in various locations, and its weekly slide shows may give you some respite from the frigid outdoors. You can take a self-guided tour of the preserve (with snowshoes in winter, if you prefer) surrounding Hallam Lake. The native indoor trout stream may be of interest to anglers and others.