The Biggest Hour for Earth

Join us again on 20 March 2027, 8.30pm your local time for Earth Hour 2027 — and get ready to celebrate 20 years of impact!

The Biggest Hour for Earth

Join us again on 20 March 2027, 8.30pm your local time for Earth Hour 2027 — and get ready to celebrate 20 years of impact!

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Until Earth Hour 2027

Give an hour for Earth

Make an impact by doing something – anything – positive for our planet. Whether you’re into food, fitness, the arts, or the outdoors, anyone, anywhere can Give an hour to care for our planet. 

 

Explore activity ideas

 

Screenshot 2025-03-03 at 2.25.55 PM
Community members from the village of Kimokouwa work to uproot and remove ipomoea hildebrandtii (Convolvulaceae) - an invasive species. The community set aside one day a week to uproot this invasive species that has caused a decline in nutritious fodder and altered ecological systems and soil. Longido district, Arusha, Tanzania. © Greg Armfield / WWF-UK


Uniting for people and our planet

Since our beginnings in 2007, Earth Hour has been known for the symbolic “lights off” in support of our planet. Over the years, we've stepped things up, breathed new life into our movement and mission to create the Biggest Hour for Earth.

In 2026, we’ll mark our 20th anniversary, celebrating two decades of collective action and storytelling from communities around the world. 

Our mission


Up your knowledge

The climate and nature crises are some of the greatest challenges humanity has ever faced. Learn more about what's causing them, what's at stake, and what we must do to turn things around.

Learn more