Celebrating Sun Day 2025 in Colorado

This September, communities across Colorado will come together to celebrate Sun Day.

Sun Day is a global day of action on September 21, 2025, celebrating the power of clean energy. In some communities, people are organizing parades of EVs or e-bikes; across the world people are making sure that homes with solar panels light a green light. Together, we'll make the sun rise on a clean energy future.

CRES and its chapters are proud to participate in Sun Day's inaugural year along so many other passionate nonprofits, companies, and individuals.  Check out some of the Sun Day 2025 events we're participating in below, along with a current list of all Sun Day events happening in Colorado. You can find a full list of Sun Day events happening around the world here.

Don't see any events in your area? Host your own event and show us how you celebrate clean energy! For example, you might host an EV test drive event or showcase local solar projects. Communities worldwise are celebrating with ribbon-cutting ceremonies, documentary viewings, green tours, informational sessions, solar picnics (think solar cookers), and more! The important thing is that we all mobilize and get the word out!

CRES Sun Day 2025 Events

Celebrating Renewable Energy
When: Saturday, September 20, from 10 AM to 2 PM
Where: Colorado Springs
The Colorado Springs Sun Day 2025 Event will take place in downtown Colorado Springs! The event is part of a nationwide coalition effort to educate the public about renewable energy, highlight its benefits, and inspire community support.
 
The event will be hosted at Poor Richard’s (324 1/2 North Tejon Street, Colorado Springs). Attendees will be able to visit information tables staffed by several local and regional organizations dedicated to advancing renewable energy and sustainability.
 
Meet with members of SECRES, Colorado 350, Third Act, Colorado Climate Advocates, Citizens Climate Lobby, and more to learn how we can grow the Pikes Peak Climate Community and be more effective advocates for a clean energy transition away from fossil fuels. Special thanks to Richard Skorman and the Poor Richards Downtown team for hosting!

​SECRES will have a table at the event. Stop by and say hello!
Learn More

"Why Solar Gives Civilization a Fresh Chance" featuring Bill McKibben & Keith Emery
When: Sunday, September 21, from 6 - 8 PM
Where: Golden
Climate author and co-founder of 350.org Bill McKibben has good news for once. His new book, “Here Comes the Sun,” shows the magnitude and potential of the solar energy revolution that’s unfolding worldwide.

This event will take place in Golden at the Jefferson Unitarian Church. After viewing a recent recording of Bill speaking to MSNBC’s Chris Hayes, we’ll hear from NREL solar pioneer Keith Emery, who will lead a discussion.

Co-sponsored by CRES and Jefferson Unitarian's Green Task Force.
Learn More

MORE Sun Day 2025 Events Happening in Colorado

Lucy Molina, Shake-Up Suncor
When: Saturday, September 13, from 10 AM to 12 PM
Where: Commerce City
As part of the Sun Day Pre-activities, please join us in Commerce City on Saturday, September 13, to help promote Environmental Justice for those living in the shadows of the Suncor oil refinery. We will meet at 10 AM with Lucy Molina and other local activists who have long been fighting against the pollution caused by the Suncor oil refinery and what Lucy calls Environmental Racism.
Learn More

Fossil Free Your Life Home Tour
When: Sunday, September 14, from 3 - 5 PM
Where: Boulder
Don't miss an in-person tour of 350 Colorado Executive Director Micah Parkin's home! Check out the improvements her family has made to reduce their reliance on fossil fuels, including solar PV, solar hot water, a ground-source heat pump, electric vehicles, a level 2 charger, water catchment, greenhouse, chicken coop, perennial edible landscaping, and gardens!
Learn More 

See the EQUINOX Light! Denver
When: Monday, September 15, from 12 - 1:30 PM
Where: Denver
Four times each year, the Solstice Window sunlight feature at First Universalist Church of Denver appears in its sanctuary. In coordination with Third Act’s September 21 Sun Day Denver event, you can join others to see the Equinox Light. You will also get a tour of the ambitious Net-Zero design with geothermal and solar-powered building systems in its major renovation in 2018.
Learn More

4CORE's Beyond Solar Tour and Gathering
When: Sunday, September 21, from 10 AM to 7 PM
Where: Durango
Join 4CORE for a two-part celebration of innovation and community-powered climate action. First, tour various homes & businesses throughout Durango as part of the Beyond Solar Guided Tour, including a special opportunity to tour Project SunShare homes. After that, get inspired at the Beyond Solar Gathering—an evening of tapas, drinks, live music provided by Pete Giuliani, and powerful storytelling.
Learn More

The History of Solar Power in Carbondale, Colorado
When: Sunday, September 21, from 11 AM to 1 PM
Where: Carbondale
Learn More

Sun Day on Aspen Mountain
When: Sunday, September 21, at 11 AM
Where: Aspen
Join the Aspen One team, professional skiers and snowboarders, Holy Cross Energy, local politicians, environmental nonprofits, and community members to celebrate Aspen's commitment to clean energy and support this growing national movement.
Learn More

Grand Valley Sun Day
When: Sunday, September 21, from 11 AM to 2 PM
Where: Grand Junction
Celebrate in Grand Junction with games, solar demonstrations, kids' crafts, educational displays, and more!
Learn More

Sun Day Bike Ride and Picnic
When: Sunday, September 21, from 12 - 1 PM
Where: Buena Vista
Bring your own bike and lunch.
Learn More

SUN Day in Telluride 
When: Sunday, September 21, from 12 - 4 PM
Where: Telluride
Residents of Telluride will proudly carry signs down Main Street, followed by a parade of e-bikers and all manner of electric cars to celebrate solar and wind power for Sun Day 2025. Test drives will be available.
Learn More

Northern Colorado Climate Meetup 
When: Sunday, September 21, from 12 - 5 PM
Where: Loveland
The Northern Colorado Climate Meetup returns and happens to align with the Sun Day celebrations. Join your fellow NoCo Climate Activists for an afternoon of networking and education!
Learn More

Lake County Community Solar Garden Sun Day
When: Sunday, September 21, from 1 - 2 PM
Where: Leadville
Celebrate the power of solar energy with Cloud City Conservation Center, get a tour of the Lake County Community Solar Garden and learn about rebates for energy efficiency upgrades for your home!
Learn More

Denver Sun Day - Celebrating the Power of Clean Energy
When: Sunday, September 21, from 1 - 4 PM
Where: Denver
Join Third Act Colorado for a day of celebration of clean energy at City Park Esplanade in Denver! There will be solar demonstrations, guest speakers and presentations, live music, fun educational activities, a costume contest, games, a mini electric house on wheels, community tables, and more!
Learn More

Ridgway Sun Day - Rise Up Ride and Shine
When: Sunday, September 21, from 4 - 6 PM
Where: Telluride
Celebrate SunDay with us in Ridgway on the Equinox - September 21st! We’ll gather at the EV charging station at the Secondary School to kick off a fun human-powered and EV ride around town together on E-bikes, OneWheels, E-motorcycles, bikes, skateboards, or EVs. We’ll stop at the Space to Create building to check out our town’s 1st solar micro-grid and onward to the Floating Lotus Brewery to toast the unlimited potential of our Sun with a beverage or NA drink compliments of Protect Our Winters.
​Learn More