A Black Bear with a radio collar — part of the DOW bear study in the Roaring Fork Valley.

Naturalist Nights

Every winter, from January through March, we invite wildlife experts and ecologists to explore and share topics of the natural world through slideshows and discussion during the Naturalist Nights Series. Besides insightful discussions, hot drinks and cookies will warm up these winter evenings. The speaker series takes place every Thursday evening at 7:30pm. We hope to see you there!

If you have topic ideas, please share them with us!

The Aspen Center for Environmental Studies (ACES) is a non-profit environmental education center, now with THREE locations:


ACES at Hallam Lake in Aspen
SUMMER HOURS: Mon - Sat: 9am - 5pm
Tel: 970.925.5756
Fax: 970.925.4819
aces@aspennature.org
100 Puppy Smith St.
Aspen, CO 81611

ACES at Rock Bottom Ranch in Basalt
SUMMER HOURS: Mon - Sat: 9am - 5pm
Tel: 970.927.6760
Fax: 970.927.6703
rockbottom@aspennature.org
2001 Hooks Spur Road
Basalt, CO 81621

ACES at Toklat in Castle Creek Valley
SUMMER HOURS: Tue - Sun: 10:30am - 6pm
Tel: 970.925.9157
Fax: 970.925.4819
toklat@aspennature.org
11247 Castle Creek Road
Aspen, CO 81611

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