Colorado Sierra Club

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Colorado Sierra Club We are a powerful collective of changemakers working together to protect CO's natural resources.

The Colorado Sierra Club is a powerful collective of more than 100,000 grassroots changemakers working together across the state to advance climate solutions, act for justice, get outdoors, and protect lands, water, air, and wildlife. We are an organization that believes in the power of working together to make change happen. As the Colorado chapter of the national Sierra Club, the largest and most influential grassroots environmental organization in the U.S., together for over 126 years we have helped shape the way people can participate in local, state, and national advocacy and policy work, so that we can better protect the planet—and each other. We have a lot more change to make, because so much more is possible. We work alongside other local and national groups because we are more powerful together.

10/15/2026

Check out who we’ve endorsed this election season by visiting the our election page: https://www.sierraclub.org/colorado/elections-and-endorsements

We are working to ensure a pro-environment majority in Colorado by supporting state-level environmental champions in Colorado that will protect the environment, wildlife, and people while addressing issues of equity, inclusion, and justice.

Paid for by Sierra Club Colorado Small Donor Committee, and not authorized by any candidate or candidate’s committee.

Utilities and fossil fuel interests continue to manufacture doubt and delay action on a just, clean energy transition. I...
10/14/2026

Utilities and fossil fuel interests continue to manufacture doubt and delay action on a just, clean energy transition. Investors like BlackRock and Vanguard hold massive stakes in fossil fuel companies therefore tying utility decisions to broad industry interests.

Clean energy is frequently the target of misleading rhetoric (exaggerating costs, questions of reliability, ignoring the benefits, and downplaying the harm of fossil fuels). The culture war narratives are intentionally deployed on this topic to divide public support.

Have you ever been frustrated by Xcel Energy but not sure if speaking out really mattered? Well it does, and we have the...
10/13/2026

Have you ever been frustrated by Xcel Energy but not sure if speaking out really mattered? Well it does, and we have the perfect opportunity for you to use your voice!

Join us on Monday, October 19 for a virtual event where we will focus on the second upcoming Large Load Tariff rulemaking for Xcel Energy which is aimed at addressing some of the many concerns about data centers coming to Colorado. The PUC wants to hear from you to get a better sense of how its decisions have an impact on people and communities across the state. Help us hold Xcel & Big Tech accountable for paying their own bills!

RSVP at the link for our Talk Back to Xcel Energy: YOU-tilities PUC Public Comment Workshop to learn more and prepare: https://act.sierraclub.org/events/details?formcampaignid=701Po00002EsrcfIAB

Download and share our one pager on adaptation and mitigation at the link: https://www.sierraclub.org/sites/default/file...
10/09/2026

Download and share our one pager on adaptation and mitigation at the link:https://www.sierraclub.org/sites/default/files/2026-10/climateresilience_adaptationmitigation_1pager.pdf

Climate resilience is a crucial consideration for Colorado communities as we experience the effects of climate change, and it is characterized by two pillars: adaptation and mitigation.

Climate change has already cost Coloradans physically, emotionally, and economically, as disasters continue to make headlines in every corner of the state. A 2026 study by the Colorado Fiscal Institute shows that preparing for and responding to climate damages will cost Coloradans over ~$50 billion by 2050. This exorbitant cost underscores the importance of implementing adaptation strategies alongside ongoing mitigation efforts.

It is time we invest in strategies to ensure we can be resilient for the future!

Utility accountability happy hour alert! We will share YOU-tilities campaign updates and ways to plug in, but really, th...
10/08/2026

Utility accountability happy hour alert!

We will share YOU-tilities campaign updates and ways to plug in, but really, these low-commitment events are to build and strengthen our communities. Let’s get together and connect on how to make this hard work easier to handle!

RSVP at the link: https://act.sierraclub.org/events/details?formcampaignid=701Po00002DJPv3IAH&mapLinkHref=https://maps.google.com/maps&daddr=YOU-tilities%20Happy%20Hour%20(Denver)@39.657933,-104.988485

What is YOU-tilities? We aim to educate, empower, and remind people that we do have the power to hold utilities accountable. Join us!

The current administration continues to attack the Endangered Species Act. This time, they’re allowing the killing of vu...
10/08/2026

The current administration continues to attack the Endangered Species Act. This time, they’re allowing the killing of vulnerable species. Help us protect these endangered animals and contact your representatives today. Visit the link below!

In Colorado, we are proud that the Canada Lynx once again roams our forests after being wiped out and painstakingly reintroduced to our state. We share the same pride as the Americans across our country who were dedicated to ensuring grizzly bears and bald eagles exist for generations to come.

Endangered species habitat protections are under attack, despite broad support for protecting our nation’s iconic species from extinction. Colorado’s own state fish, the Greenback Cutthroat Trout, was thought extinct for decades until a single population was found in one small creek. If we pollute or dam the streams this fish relies on, our country will reverse 50+ years of success in saving endangered species from disappearing forever.

For over 50 years, Americans have continued to speak up for endangered species because they are our shared legacy and a great investment in our country. Protections for endangered species have successfully saved more than 99% of species listed for protection from extinction.

Tell the current administration that they work for all Americans, not just those self-interested few who want to increase their profits by decreasing habitat and species protections.

https://act.sierraclub.org/actions/National?actionId=AR0632135&fbclid=IwY2xjawUeOO5wZG9mBWV4dG4DYWVtAjEwAGJyaWQRMXZnTGZob3RtTWh2cXlzdTNzcnRjBmFwcF9pZBAyMjIwMzkxNzg4MjAwODkyAAEeYqpIzPwR2IgLh-7fvE-upOHdGGAJyCLtNXSiGaArdB4pAamokKNBkHalizk_aem_O8DzFsOJGDA4IFOrIfn6zQ

Amendment 83 isn’t about protecting hunting and fishing. Instead, this amendment is backed by out of state, wealthy spec...
10/07/2026

Amendment 83 isn’t about protecting hunting and fishing. Instead, this amendment is backed by out of state, wealthy special interests who want to put vague language into our constitution.

If passed, Amendment 83 could mean:

- Our state legislative process being undermined by out of state groups trying to use CO had a stepping to the West

- Making CPW’s ability to do its job and protect conservation, outdoor enthusiasts, and hunters/anglers more difficult

Don’t believe us? Just read the 2026 State Ballot Information Booklet!

Decisions about Colorado’s wildlife should remain science-based, flexible, and accountable to Colorado’s voters, rather than locked into our constitution or decided in court.

This morning we gathered with partners, friends, and community to demand that the City and County of Boulder get their d...
10/05/2026

This morning we gathered with partners, friends, and community to demand that the City and County of Boulder get their day in court.

In 2018, the City and County of Boulder sued ExxonMobil and Suncor for their contributions to climate change. Today, the U.S. Supreme Court heard the case. Their decision will determine whether and how communities can hold Big Oil accountable for climate impacts.

Make sure you’re signed up to receive our newsletter to get updates on the case and stay involved!

Curious about what we do at the Colorado Sierra Club? Looking for new opportunities and ways to volunteer? If this sound...
10/01/2026

Curious about what we do at the Colorado Sierra Club? Looking for new opportunities and ways to volunteer?

If this sounds like you, join us on Tuesday, October 6 at 5:30 PM to learn more about who we are, how to volunteer and take action, and other ways to be involved! RSVP here: https://www.sierraclub.org/colorado/calendar

Thank you to to one of our amazing volunteers, Kasey Butcher Santana, for sharing your story and perspective as a Colora...
09/30/2026

Thank you to to one of our amazing volunteers, Kasey Butcher Santana, for sharing your story and perspective as a Colorado consumer during last Wednesday’s press conference!

Amendment 82 threatens to impact communities with price hikes and pollution. Coloradans deserve better. Vote no on Amendment 82!

Address

1536 Wynkoop Street, #200
Denver, CO
80202

Opening Hours

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

Telephone

+13038618819

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