Parent & Child nature series
Best suited for ages 1-4
10/12/2015 - 12/14/2015

Eagles, Hawks, & Owls

Learn all about raptors in this close-up encounter with our resident, non-releasable birds of prey the Golden Eagle, Great Horned Owl, and Red-tailed Hawk. Visitors of all ages will enjoy this one-hour program!

$10 suggested donation per family / free for members.

Rain or shine!

6/16/2014 - 8/30/2014
Hallam Lake
4PM Monday - Friday
2PM Saturday

Maroon Bells Programs

10:15am AND 1:15pm Crater Lake Hike

3.6 miles round trip, 500 ft. elevation gain
Join a naturalist for a one-way hike to Crater Lake. This one-hour hike focuses on the flora, fauna, and geology along the trail.

10:15am AND 1:15pm Landmarks in Time Walk
Walk along Maroon Lake for 45 minutes with a naturalist. Investigate the history of this geologic wonder and ecological paradise.
All programs meet at the Maroon Information Center (MIC) at Maroon Lake
Courtesy of the U.S. Forest Service
Daily, free
6/16/2012 - 9/03/2012
Parent & Child nature series
Best suited for ages 1-4
10/12/2015 - 12/14/2015
Wildflowers on Aspen Mountain

Aspen Mountain Walk

Ride the gondola to the summit of Aspen Mountain and enjoy a naturalist-guided walk surrounded by inspiring views. These 45-minutes-walks are offered EVERY HOUR between 11 am and 3 pm.

No reservations necessary. Courtesy of the Aspen Skiing Company with the purchase of a gondola pass.

Meet every day atop of Aspen Mountain at the ACES Information Station.
11am, 12pm, 1pm, 2pm, and 3pm
Daily, Free

6/16/2012 - 9/03/2012
Monday, 11AM - 5PM
Tuesday - Sunday, 9AM - 5PM
Tel: 970.925.9157
Fax: 970.925.4819
11247 Castle Creek Road
Aspen, CO 81611

Monday - Friday, 9AM - 5PM
Saturday, 9AM - 1PM
Closed Labor Day
Tel: 970.927.6760
Fax: 970.927.6703
2001 Hooks Spur Road

Basalt, CO 81621

Monday - Saturday, 9AM - 5PM
Closed Labor Day
Tel: 970.925.5756
Fax: 970.925.4819
100 Puppy Smith Street
Aspen, CO 81611

$50 Red-tailed Hawk Membership

Membership Level: 
$50 Red-tailed Hawk Membership

Monitoring Forest Health from Above

As climate change continues to trigger dramatic changes in our forest ecosystems, Aspen Center for Environmental Studies’ (ACES) For the Forest program is committed to producing groundbreaking scientific research on forest issues and actively restoring our forest landscapes.


North Star Nature Preserve Bank Stabalization Project

ACES is partnering with Pitkin County Open Space and Trails, Pitkin County Healthy Rivers and Streams, Aspen Valley Land Trust, City of Aspen, Roaring Fork Conservancy, and Roaring Fork Outdoor Volunteers to implement habitat improvements at North Star Nature Preserve, east of Aspen. Volunteers are needed to help plant native vegetation on a re-graded river bank in an attempt to restore the Roaring Fork River's degraded edges. The group's work will be focused on two streches that amount to more than 600 feet of river bank.

Volunteers will meet from 8:30AM to 5PM on Saturday, September 19. Dinner will be provided. This is a family friendly project. 

Volunteers should bring warm clothes, sun protection, rain gear, long sleeved shirt and pants, closed toed shoes, water, and your own lunch. Please bring work gloves as well if you have them. Tools will be provided.

Visit to register for this volunteer opportunity.

Free Members

8:30AM - 5PM
North Star Nature Preserve

Jessica Catto Dialogue | Joel Salatin

Join ACES, City of Aspen Parks and Recreation, and Pitkin County Open Space and Trails for "Local Food to the Rescue" a lecture by Joel Salatin, famed farmer of Polyface, Inc.

For local food to be a credible part of the global food system it must develop six integrated components: production, processing, marketing, accounting, distribution and patrons. In this lecture Joel will educate our community on how to build a functional local food system, including economies of scale, collaborative food shed distribution, and meaningful volume.
Joel has been featured by food guru Michael Pollan in the New York Times bestseller The Omnivore's Dilemma, as well as the award-winning documentary, Food Inc. Joel has authored nine books on the topic of farming and sustainability where he passionately defends small farms, local food systems, and the right to opt out of the conventional food paradigm. Polyface Inc. (“The Farm of Many Faces”) has been featured in Smithsonian Magazine, National Geographic and countless other radio, television, and print media. Ever the entertainer, Joel describes his occupation as “mob-stocking herbivorous solar conversion lignified carbon sequestration fertilization.” For more information, visit
Please walk, bike, bus, or carpool to Paepcke Auditorium as parking is very limited. 
WE-cycle is generously offering free free and green rides to and from the lecture. Skip the parking hassles and pick up a WE-cycle at any of the 16 stations conveniently located around Aspen to ride to the Aspen Institute station adjacent to Paepcke Auditorium. Call 970.205.9222 to redeem.

Paepcke Auditorium
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