Earth Hour

About Earth Hour

How long until Earth Hour?
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Dates of Earth Hour
2026 InternationalMar 28 International Sat, Mar 28Observances Holiday 2025 InternationalMar 22 International Sat, Mar 22Observances Holiday 2024 InternationalMar 23 International Sat, Mar 23Observances Holiday 2023 InternationalMar 25 International Sat, Mar 25Observances Holiday 2022 InternationalMar 26 International Sat, Mar 26Observances Holiday
Summary
Find out the dates, history and traditions of Earth Hour.

Every year, at 8:30 pm on the last Saturday of March, millions of people across the world join in raising awareness of the issues facing our planet.

Started by the World Wildlife Fund (WWF) and partners as a symbolic lights-out event in Sydney in 2007, Earth Hour is now one of the world's largest grassroots movements for the environment.

Each year, Earth Hour engages millions of people in more than 180 countries and territories, switching off their lights to show support for our planet. 

But Earth Hour goes far beyond the symbolic action of switching off - it has become a catalyst for positive environmental impact, driving major legislative changes by harnessing the power of the people and collective action.

Earth Hour is open-source and everyone, anyone, is welcome to take part and help amplify our mission to unite people to protect our planet. 

All events on March 22nd 2025