The Green Expo, CORE's Annual Event, returns in 2026 at Aspen Meadows, bringing together sustainable businesses, products, and services from across the Roaring Fork Valley and beyond. This free, half-day event brings together industry professionals and community members to explore practical solutions to reduce carbon emissions.

We’re seeking exhibitors that are doing meaningful work in energy, electrification, and sustainable building for The Green Expo.

Interested? Contact Kate LaMair for details.

The montane lifezone is especially diverse, sandwiched between the habitats of the high mountains and the foothills. Slope aspect also plays an important role in montane ecosystems, creating rich patches of diversity on the landscape. Birds, both migratory and resident, benefit from the rich resources in this broad ecological belt, including nesting sites, forage, and migration habitat. On this field trip, we will explore the birdlife along Snowmass Village’s Nature Trail, which meanders along upper Brush Creek through aspen groves, stands of conifers, riparian willows, beaver ponds, and open meadows. Species we hope to see include Northern Yellow Warbler, Western Wood-pewee, Warbling Vireo, Steller’s Jay, Red-naped Sapsucker, MacGillivray’s Warbler, Tree Swallow, Northern House Wren, and more. Hiking distance will be about 3.5 miles.

Watercolor is a wild medium often taught as a slow process, but it doesn’t need to be! Sometimes it is hard to choose between sitting still and painting and taking the time to move your body! Both are wonderful ways to connect with a landscape and feel present. Come explore the landscape around Toklat and the upper Castle Creek Valley with artist and long-distance hiker, Nika Meyers, through watercolors, drawing, and hiking. We will explore what it means to not just look but really see, develop plein air painting techniques, find unique ways of expression, and share in the magic that the landscape has to offer

Join New York Times bestselling author and longtime friend of ACES, T.A. Barron, for a conversation and book signing at ACES at Hallam Lake about his newest book, Naming Nature. T.A. Barron brings us this captivating exploration of how human cultures across time and geography have described the living world around them. From the poetic to the practical, the reverent to the resourceful, every language holds unique insights into how we perceive and relate to nature.

Stars Above Aspen invites guests of all ages to explore the wonders of the cosmos from 11,212 feet. As the sun sets over the Elk Mountains, guests get ready for a night of discovery—where science, nature, and a sense of awe come together under the stars.

Cost trackers were designed to address specific ratemaking issues — not to become permanent and prevalent features of utility cost recovery. As utility bills continue amid a deepening affordability crisis, regulators and lawmakers have an opportunity to rethink these mechanisms to rein in the potential for undisciplined utility spending.

Calling all runners and Mt. Sopris enthusiasts! RFOV is partnering with the USFS, Wilderness Workshop and Alpine Performance Labs to host a day of trail improvements on the bottom portion of the Thomas Lakes Trail! Come join us on Carbondale's closest access trail to the Maroon Bells - Snowmass Wilderness! One grand prize will be raffled for all volunteers for free training sessions at Alpine Performance Labs!

Join us for an evening talk by Scott Weidensaul! At a time when the news for birds – for the planet – has rarely seemed more grim, there is reason for hope. We’ve restored faltering bird populations in the past, bringing back once nearly extinct raptors and waterfowl. And despite the odds today, all around the world, people are actually reviving bird populations, providing a roadmap for wider recovery.

Join ACES Director of Naturalist Programs, Jim Kravitz on this rare opportunity to discover the far side of the North Star Preserve, which is otherwise closed to the public. This small group experience will meander through the entire length of the preserve, traversing riparian areas and aspen fans along the flanks of Aspen Mountain. Along the way we will discover, observe, and learn about the rich animal and plant life that make North Star their home. During this one-of-a-kind walk we will observe ecological features and natural habitats of North Star and discuss the importance of land preservation in our valley.

Recently acquired by Pitkin County Open Space and Trails in 2024, Snowmass Falls Ranch is a 650-acre parcel that serves as a gateway to the Maroon Bells-Snowmass Wilderness. The area has over a century of ranching history as well as valuable wildlife habitat and stunning scenery. In its transition to public land, a key objective is the removal of biennial noxious weeds and the spreading of native seeds in order to restore the native plant community. Come help us restore this beautiful, wilderness-adjacent property for the third year in a row.

Friday, July 17, 2026 | Paepcke Auditorium | 5pm | Free Public Lecture

Forty Years Of Wildlife Filmmaking with Sir David Attenborough

Presented by Alastair Fothergill | Producer and Co-Founder of Silverback Films

Join the Eagle River Coalition and Wilderness Workshop for a bilingual, hands-on exploration of the Homestake Valley, which is home to ancient fens. This rare ecosystem provides incredible biodiversity, native flora and fauna, is home to numerous threatened species, and functions as a critical carbon sink in a changing climate. Amid an ongoing drought and the threat of a potential transmountain diversion, inventorying and understanding the Homestake Valley allows us to better advocate for these places now and into the future. We’ll be using the iNaturalist app to photograph plant species and add to the ongoing bioblitz project.  Experts from Walking Mountains, Colorado Moutnain College, Roaring Fork Audobon, and Wright Water Engineers will be there to help you identify and document plant species and learn about this fascinating ecosystem in our backyard.

This annual celebration brings together this community to support the water, wildlife, and way of life that make this such a special place to call home. It's the best night of the year, gathering with you, and seeing what is possible with your partnership. Enjoy curated cocktails, a three-course dinner, and inspirational stories of conservation in your backyard.

We had such a great time at our 30th Anniversary project at the Maroon Bells, we thought we'd do it again in 2026! Come join RFOV, the USFS, and Wilderness Workshop for a day of trail improvements and targetted weed removal in the Iconic Maroon Bells Scenic Area!

Experience the sights and sounds during the time when day shifts to dusk in the cattail marsh, pond, and sedge meadow habitats of Rock Bottom Ranch. As red-winged blackbirds and song sparrows wind down their activities and wild turkeys fly up to safe roosts in the nearby cottonwoods, the snipes begin their winnowing display flights and Virginia rails start calling. We will experience this fascinating and brief window of time with the goal of learning about birds that are active at dusk and dawn. As daylight fades, our dominant sensory awareness will shift from visual to auditory and we will become immersed in a different and fascinating world.

While Colorado is excited to celebrate Bike Month every June, the highlight of the activities is Bike to Work Day on June 24, when employees leave their cars at home and enjoy bicycling to work. The annual free event draws tens of thousands of Colorado commuters who celebrate the day by swapping a ride in their cars for a ride on two wheels. Participating helps improve air quality, reduce greenhouse gas emissions, reduce traffic congestion. Plus, it’s fun! Studies have shown that people who commute by bike have the happiest commutes of all. Kick off your workday feeling energized, de-stressed and refreshed.

What does it really mean to care for a landscape? It's a bigger question than we usually make room for and it's one worth sitting with. We talk a lot about showing up for the land. But what if the most important shift isn't in what we do but rather how we see the world around us?

Join us at the inspirational setting of Rock Bottom Ranch for an evening of birds and watercolor! The class will start off with a short birding outing with ACES Bird Guide Rebecca focusing on the Cedar Waxwing and other resident birds, their behavior, and how they interact with the environment. The students will then explore with Amy the various techniques, materials, and tools of watercolor to paint several perspectives of the Cedar Waxwing. One of the valley’s most beautiful birds, its silky plumage of browns, grays, and yellows is accented by its bold black mask and expressive crest. Let your creativity fly!

Join us select Thursdays at Rock Bottom Ranch to meet our colorful flock of laying hens, learn their breeds and role at Rock Bottom Ranch, and help collect our delicious multi-colored eggs.