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Aspen Center for Environmental Studies (ACES)

4.8 (85)

Explore Aspen's natural side with interactive exhibits, wildlife sightings & naturalist-led programs at this environmental education center.

The Aspen Center for Environmental Studies (ACES) is a non-profit environmental education organization offering immersive experiences at Hallam Lake Nature Preserve in the heart of Aspen. Visitors can explore trails, observe wildlife, and participate in naturalist-led programs focused on ecological literacy, forest health, and more.

A brief summary to Aspen Center for Environmental Studies

  • Monday 9 am-5 pm
  • Tuesday 9 am-5 pm
  • Wednesday 9 am-5 pm
  • Thursday 9 am-5 pm
  • Friday 9 am-5 pm

Local tips

  • Bring binoculars for enhanced wildlife viewing along the Hallam Lake trails.
  • Check the ACES website for a schedule of naturalist-guided walks and programs.
  • Visit the indoor trout stream at the visitor center to see native Colorado River cutthroat trout.
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Getting There

  • Walking

    From downtown Aspen, ACES is an easy walk. Head north on Mill Street, then turn left onto Puppy Smith Street. Continue past the post office; the road dead-ends at ACES. Walk down the driveway to the visitor center.

  • Public Transport

    The Roaring Fork Transportation Authority (RFTA) provides free bus service within Aspen. Ride any free in-town RFTA bus to Rubey Park. From Rubey Park, it's a short walk north on Mill Street, then a left onto Puppy Smith Street to ACES. RFTA bus service from Aspen/Pitkin County Airport is free to Aspen.

  • Parking

    If driving, follow directions to 100 Puppy Smith Street. Turn left at the gate to access the parking area. Parking is limited. Street parking is available in Aspen, with pay stations costing $2-$6 per hour. The Rio Grande Parking Plaza offers hourly/daily rates.

Discover more about Aspen Center for Environmental Studies

The Aspen Center for Environmental Studies (ACES) is dedicated to "educating for environmental responsibility". Founded in 1968, ACES provides innovative programming for all ages, inspiring a lifelong commitment to the Earth. ACES operates three locations in the Roaring Fork Valley: Hallam Lake, Rock Bottom Ranch, and the Catto Center at Toklat. Located on Hallam Lake, a 25-acre nature preserve in Aspen, ACES offers a tranquil escape with a half-mile loop nature trail meandering through diverse habitats. Visitors can spot local wildlife like deer, foxes, beavers, and various bird species. The visitor center features an indoor trout stream with native cutthroats, an environmental library, and a gift shop. ACES provides numerous natural science programs throughout the year, including naturalist-guided walks, bird of prey demonstrations, and snowshoe hikes in the winter. The center also rehabilitates injured birds of prey. ACES collaborates with various organizations to promote environmental awareness and stewardship. The new Kanders Family Science Teaching Lab features interactive exhibits to inspire exploration of the natural world. Whether you're a nature enthusiast or simply seeking a peaceful retreat, ACES offers an enriching experience in the heart of Aspen.

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