Earth Day 2026 is on Wednesday, April 22. Communities across Northern Colorado are marking the week around the occasion with a variety of events.

Here’s a rundown of what’s happening near you.

Denver

Earth Day Trash Pick Up

Volunteers will clean up around Bluff Lake to keep the site healthy for visitors and wildlife. Youth 8+ may attend with parental supervision. Trash bags, trash grabbers, and gloves will be provided.

Earth Day At Four Mile

Girl Scout Troop 67603 will lead Earth Day service projects. The event will also include Indigenous vendors and dance performances, free seed bombs and nature-inspired crafts.

Fort Collins

Earth Day Fort Collins

Odell Brewing is a new venue for this event. Features include exhibitors, food trucks and kids’ activities – including an appearance by the CSU Bug Zoo.

Earth Day Festival

CSU student organizations and academic departments will have information tables alongside Fort Collins sustainability organizations. Attendees can find resources, activities and opportunities to get involved in sustainability initiatives.

Golden/Arvada

Earth Day Volunteer event

Volunteers will work on trail improvements and a restoration project including seeding, planting, and weeding. Breakfast and lunch will be provided, and there will be a raffle.

Greeley

3rd Annual Earth Day Birthday

It’s Mariposa’s 3rd Annual Earth Day Birthday party! Mariposa is turning 42, and there will be treats, a plant swap and experts with advice on house plants.

Earth Day Community Cleanup

Mend Community Organization is putting on this trash pickup. The nonprofit started in 2024 as “a way to genuinely connect people who are passionate about living a more sustainable and environmentally-friendly life.” Cleanup supplies will be provided.

Let’s Celebrate Earth Day!

Several local environmental organizations are coming together to bring the community environmentally friendly crafts, stories, games, giveaways and hands-on learning. Free events will be happening inside and outside of LINC Library Innovation Center. No registration is required.

Lafayette

Earth Day Volunteer Event

Pull on your closed-toed shoes and clothes you don’t mind getting dirty to plant native plants, pull pesky invaders, and give local soils a boost alongside the Open Space Division and Sustainability Department. Pizza, snacks and water will be provided. Registration is required and reserved for Lafayette residents. 

2026 Hard-to-Recycle Event

This event is open to City of Lafayette residents only, and advance registration is required. Residents can drop off many items for free, including batteries, bubble wrap, fluorescent tubes and bulbs, paint, plastic shopping bags, and household cleaning supplies.

Longmont

12th Annual Longmont Earth Day Celebration

This family-friendly event features a clothing swap, a bike drive and a community clean-up at Centennial Park. A local farm is also stopping by with alpacas. Check the Facebook event for updates.

Lyons

Earth Day Expo

The expo is the finale to Earth Week, beginning Saturday, April 18. Other events include free plant-based goodies, workshops and a community cleanup of the St. Vrain River.

Thornton

Earth Day Habitat Build

Participants will be building birdhouses and bat boxes that will be placed throughout the city of Thornton. Materials and tools will be provided. Registration deadline is Monday, April 20.

Westminster

Adams County Earth Day Celebration 2026

This is Adams County’s second Earth Day Celebration. There will be an EV Ride and Drive, music, free food, air brush tattoos, educational exhibits, and kids’ activities.