Celebrate Earth Day in Mill Valley, with fun activities, green exhibits, art and music for all ages!

Come join us at Earth Day Marin 2026, our popular environmental celebration on Sunday, April 26, 2026, from 12 to 3pm, at the Mill Valley Community Center in Marin County. 

Earth Day Marin is a free community event for people of all ages, with informative booths, fun activities, art, music, games and talks in a beautiful outdoor setting. We expect this to be Marin’s largest Earth Day event!

Visit 50 booths hosted by green businesses, environmental and community groups to help build a more just and sustainable world. You will learn about these climate actions: use clean energy, electrify your home, ride electric vehicles, eat well, live lightly, protect nature, build resilient communities, support climate justice and save democracy!

Earth Day Marin is produced by Green Change with support from the County of Marin, City of Mill Valley, Sustainable Marin and many more partners.