Get outside and enjoy springtime in the Rockies on a Sierra Club day hike. We have several upcoming hikes to choose from, this month through June. Check out our calendar for outing details and to RSVP! 
 

What the Frack is a new communications hub that aims to shift public opinion and educate Coloradans about the true costs of fracking: to our air and water, our health, and our economy. We want people across the state to see the full picture of what’s at stake—and why we must stop expanding fossil fuel development now and focus on a just transition for our communities and workforce.
 

We're leveling up our tabling swag without the waste and we want your help! Join us on Thursday, May 1 for a Sustainable Crafting Swag Happy Hour at The Alliance Center in Denver!
 

2025 Cinco de Mayo - Denver Civic Center Park May 3rd & May 4th 10am to 8pm. The Sierra Club has been a vendor and sponsor at the annual Cinco de Mayo event over the last eight years. We will be promoting the Sierra Club and their upcoming programs and events. This is also a call for volunteers to work the booth for two-hour time slots. If you are interested in volunteering for a time period on either day please RSVP!
 

Raising awareness! Calling people to action! Touching the Earth! Please join us for one or more events. We have an exciting year planned. Renew in nature. Make a difference. Support Sierra Club local work. We are looking for people like you to get involved.
 

Did you know that 100% of every donation to the Colorado Sierra Club stays right here in Colorado? It's true! Your gift to the Colorado Chapter supports our work to protect Colorado's wild places, secure a clean energy future for our state, and much more. And the best part? There are so many ways to give! From monthly donations to estate gifts, your generosity keeps our work going for future generations. Make your Earth Day gift today!