Snowshoe & Ski Tours

Travel along mountain streams, over ridgelines, and through beautiful valleys in the Aspen area while learning about mountain ecology on ACES' naturalist guided snowshoe tours. Each winter, daily snowshoe tours are offered on top of Aspen Mountain, Snowmass Mountain, and at the Ashcroft Ghost Town. Check back in October for complete information.

An Earthday Party!

Join ACES, City of Aspen, and CORE to celebrate Earth Day and ring in the 2015 Green Drinks season! Head to Hallam Lake to meet community members interested in environmental issues, explore the nature preserve, and enjoy locally sourced snacks, and libations. Earth Day activities will include advocacy opportunities, a photo booth, prizes, and more.



Presented in partnership with:



Free Members
Free Non Members

5PM - 7PM
Hallam Lake

Rock Bottom Ranch Farm Tour

Join Rock Bottom Ranch staff and educators to explore the Ranch, animal paddocks, hoop houses, and gardens while learning the science behind our vegetable production and livestock rotational grazing system. Tours are appropriate for all ages and provide opportunities to interact with our livestock and learn where your food comes from!

Moms’ groups, school groups and groups larger than one family, please call ahead to make a reservation 970-927-6760.

$10 suggested donation per family / free for members

Rain or shine!

5/01/2015 - 10/16/2015
Rock Bottom Ranch
Monday - Saturday

Politics of Sustainability Lectures | Robert Nickelsberg

Robert Nickelsburg will be present on his experience as a photo journalist in Afghanistan over the past two decades. Robert is an award-winning photojournalist who covered Afghanistan for 25 years for Time magazine and The New York Times from 1988-2013. His new book, Afghanistan - A Distant War, won the Olivier Rebbot Award in 2014 from the Overseas Press Club for the best reporting from abroad in books and magazines, and chronicles Afghanistan from when the Soviet Army withdrew in 1988 until the beginning of the US-NATO withdrawal in 2013. The book "captures the brutality and suffering, often amid stunning beauty,of the convulsions that have engulfed Afghanistan. Here he presents an extraordinary portfolio of images, accompanied by incisive commentary, that explains the country's tragic history."

Aspen Center for Environmental Studies is now home to the long-successful Tomorrow’s Voices program, founded by local teachers AO Forbes and the late Willard Clapper to cultivate responsible citizenship and ethical leadership in the youth of the Roaring Fork Valley. 

Each year, they open up a selection of their Politics of Sustainability classes to the public. Join us for what is sure to be an inspiring inter-generational conversation.

Free Members
Free Non Members

7:15PM - 9PM
The Barn at Colorado Rocky Mountain School

Rock Bottom Ranch Easter Hams

Eat local this Easter with bone-in smoked hams from Rock Bottom Ranch! Our heritage-breed pigs are pasture-raised and Animal Welfare Approved, certifying they were raised to the highest animal welfare and environmental standards. Click here to learn more about our sustainably-raised pigs.

Orders must be placed with deposit by April 1. Quantities are limited and will be sold first come, first served. Hams will be prepared on a made-to-order basis. 

• $9.99 per pound + tax
• Estimated weight: 6 - 8 pounds each
• Estimated cost: $60 - $80 each
• Pickup at Rock Bottom Ranch on April 2nd or 3rd between 9AM and 5PM
• Pickup at Hallam Lake on April 3rd between 10AM and 4PM. 

ACES members at the Bighorn Sheep ($300) level and above enjoy early access to these sustainably-raised hams and received purchasing information via email on February 20. Hams will be available to the public on March 5.

Click here to reserve your ham with a $30 deposit.*
The remainder of the cost will be due at pickup. 

Call or email Jason Smith with questions at 970-927-6760 or


*By placing my order and deposit for bone-in smoked ham(s), I agree that I am purchasing a USDA-inspected fresh ham(s) that will be cured and smoked by Innovative Foods, LLC, Evans, Colorado.  Innovative Foods, LLC will prepare the ham(s) to meet all food-handling requirements as established by the State of Colorado.  I authorize a representative of Aspen Center for Environmental Studies (ACES) to accept delivery of the ham(s) from Innovative Foods, LLC and transport theham(s) to Rock Bottom Ranch, Basalt, Colorado or Hallam Lake, Aspen, Colorado.  I agree to pay ACES the remaining outstanding amount for the ham(s) at pick-up.  If I fail to pay in-full and pick-up the ham(s) by 4pm on April 3, 2015, I will forego my deposit and ACES will retain the ham(s). 


Wildside with ACES

Join an ACES Naturalist for a fun and informative program with our educational animals! Animal guests may include ACES resident Great Horned Owl, boa constrictor, tarantula, bearded dragon, and more. ACES Naturalists will highlight special animal adaptations and unusual facts in this participatory, hands-on experience. 

  • Mondays (February – March) at 4PM. Meet at the Snowmass Info Lounge in Base Village (across from Clark's Express).
  • This is a complimentary VIK Snowmass program.
  • No reservations.
  • Call ACES during open hours (Monday - Friday, 9AM - 5PM) with any questions.

Program made possible through a partnership between ACES, Aspen Skiing Company, Related, and Snowmass Hospitality.

Free Members
Free Non Members
2/02/2015 - 3/30/2015

Snowmass Info Lounge in Base Village (across from Clark's Express)

Valentine's Drive

Valentine's Day is coming you have a tweetheart?

This Valentine's Day, sweeten someone's day with a handmade, heart-shaped bird seed valentine and help underwrite ACES Raptor Residency and Education Programs.

For a $20 donation your valentine will be hand-made, gift wrapped, and mailed in a special box with a personalized valentine featuring a bird pun of your choice. 

1. Owl be yours, Valentine!
2. Love at first flight. Happy Valentine's Day!
3. I'll sparrow no expense for you, Valentine!
4. Will you be my tweetheart?
5. You're a hoot. Happy Valentine's Day!

You may order multiple valentines to be sent to different addresses. To ensure out of town delivery by February 14th, order by February 5th. For delivery in the Roaring Fork Valley, order by February 9th. Valentines can be purchased for pick up at Hallam Lake.


Save the date for ACES Raptor Fair at Hallam Lake:
Friday, July 3, 2015, from 3PM - 6PM
Generously sponsored by:



1/29/2015 - 2/14/2015

Your Change Creates Change

Support ACES Children's Education Fund every time you shop at Whole Foods Market Roaring Valley!

ACES has been chosen as a recipient of Whole Food's "Your Change Creates Change" program. Through April 12, bring in your reusable shoping bags and donate your bag credit to ACES in support of environmental science education throughout the Roaring Fork Valley.

Thank you for supporting our important work!

Capturing Glacial Change Through 3D Time-lapse Photography on the Helheim Glacier, Greenland

At nearly 4-miles wide and flowing at speeds of up to 90-feet per day, the Helheim Glacier in southeast Greenland is one of the main tidewater glaciers draining the Greenland Ice Sheet, contributing to global sea level rise. Capturing measurements of the glaciers movement on a daily timescale, needed to understand how changing atmospheric and ocean conditions affect the glaciers speed, is extremely difficult due to its vast scale and remote location. Satellite imagery provides detailed information on these areas, but rely on long orbit times and clear skies to image the glacier. Onsite time-lapse cameras installed at glaciers around the world have visually uncovered the hourly movement of the ice, yet are not quantitative measurements. In this talk, LeWinter will discuss the Greenland Atlas Project designed to fill this gap in knowledge, from the multiple years of developing and testing a long-range laser scanner, to the engineering of the fully autonomous terrestrial laser scanner (Atlas) system to be deployed and operated year-round at Helheim Glacier to capture high-resolution 3D time-lapse imagery. The system is complex, must be completely self-powered and controlled onsite, and will be faced with some of the harshest conditions on the planet.

Adam LeWinter is an engineer and scientist at the US Army Corps of Engineers Cold Regions Research and Engineering Laboratory, where he focuses on large scale changes in glacier, alpine, and volcanic settings using state-of-the-art laser scanning. Ranging from the Greenland Ice Sheet to Kilauea Volcano, Hawaii, LeWinter specializes in collecting visually captivating data in the most extreme environs. LeWinter was the lead engineer and field manager for the Extreme Ice Survey, and is an Emmy Award winner for his work on the film Chasing Ice. His work aims to reveal processes in nature that are hidden to the naked eye.


Tea, donated by Two Leaves and A Bud and Paradise Bakery cookies will be offered.

Adam will also be presenting on Wednesday, January 21 at 5:30 at Carbondale's Third Street Center.

Naturalist Nights are brought to you through a partnership between Aspen Center for Environmental Studies, Wilderness Workshop, and Roaring Fork Audubon.


Thank you to our community sponsors:





Free Members
Free Non Members
Hallam Lake

A Fire History of Hunter Creek Valley

Fire is a critical ecosystem process shaping patterns of forest characteristics from stands to landscapes in the western United States. Following a century of fire suppression practices in the region, natural patterns of wildfire have been significantly altered in many forest types, resulting in significant ecological consequences. Specifically, unnatural patterns of fire have resulted in unnatural forest conditions (species composition and tree density) and set the stage for extensive, high-severity fires and bark beetle outbreaks. Consequently, forest ecosystem management actions are focused on restoring forests to pre-fire suppression characteristics. Restoring forests to natural conditions has the added benefit of increasing forest resilience to the impacts of climate change. However, not all forests have been impacted by fire suppression, and management activities intended to restore stands in these forests could actually create unnatural forest conditions and decrease system resilience to climate change impacts. Consequently, it is essential to identify the need for restoration for individual sites and forest types before implementing restoration activities. In this talk Jason will present results from a tree-ring based reconstruct of fire history for Smuggler Mountain and the Hunter Creek drainage, and their implications for the need for forest restoration at the site.

Jason S. Sibold (PhD) is an assistant professor of geography in the Department of Anthropology at Colorado State University. Dr. Sibold’s research focuses on the role of wildfire, insect outbreaks and their interactions in shaping forests in the US RockyMountains and southern Chile. Dr. Sibold was recently called to testify before the House Committee on Natural Resources on the scientific understanding of bark beetle outbreaks and their interactions with wildfires. His research is supported by the National Park Service, US Geological Survey, Aldo Leopold Wilderness Research Institute, Fulbright Scholars Program and Joint Fire Sciences Program and has been published in journals including Ecological Applications, Journal of Biogeography, Canadian Journal of Forest Research and Landscape Ecology.


Tea, donated by Two Leaves and A Bud and Paradise Bakery cookies will be offered.

Jason will also be presenting on Wednesday, March 11 at 5:30 at Carbondale's Third Street Center.

Naturalist Nights are brought to you through a partnership between Aspen Center for Environmental Studies, Wilderness Workshop, and Roaring Fork Audubon.


Thank you to our community sponsors:





Free Members
Free Non Members
Hallam Lake
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