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Earth Hour 2024

Earth Hour is an annual environmental campaign that brings attention to the effects of climate change by asking people to switch off lights at homes and businesses for an hour at 8.30 pm (20:30), local time, usually on the last Saturday of March.

It's time to switch off the lights during Earth Hour.

©iStockphoto.com/Trista Weibell

About Earth Hour

Earth Hour is a global WWF (formerly known as World Wildlife Fund) climate change initiative. It is an event that aims to create awareness of people taking responsibility toward a sustainable future by turning the lights off. Earth Hour is not to be confused with Earth Day.

What Do People Do?

Millions of people turn off their lights for Earth Hour at 8.30 pm (20:30) in their local times on the last Saturday of March. Iconic buildings and landmarks from Europe to Asia to the Americas have stood in darkness during previous Earth Hours. Some people enjoy Earth Hour with a candle-lit dinner or a candle-lit bath, while others host large events or parties, either in darkness or with candles, to celebrate Earth Hour.

Businesses and government organizations, as well as community and political leaders, also take part in Earth Hour. It's about giving people a voice on the planet’s future and working together to create a sustainable low carbon future for planet earth.


Earth Hour started in Sydney, Australia, in 2007. This event saw 2.2 million homes and businesses turn their lights off for one hour to make their stand against climate change that year. Earth Hour had become a global sustainability movement with more than 50 million people across 35 countries participating in 2008. Global landmarks such as the, Sydney Harbour Bridge, the CN Tower in Toronto, the Golden Gate Bridge in San Francisco, and Rome’s Colosseum, all stood in darkness for Earth Hour. In March 2009, hundreds of millions of people took part in the third Earth Hour.

WWF, which organizes the annual Earth Hour event, aims to stop the degradation of the Earth's natural environment. It also focuses on building a future where people live in harmony with nature. The organization functions through a network of more than 90 offices in more than 40 countries worldwide. Its first office was founded in Morges, Switzerland, on September 11, 1961.

Earth Hour Observances

YearWeekdayDateNameHoliday Type
2019SatMar 30Earth HourWorldwide observance
2020SatMar 28Earth HourWorldwide observance
2021SatMar 27Earth HourWorldwide observance
2022SatApr 2Earth HourWorldwide observance
2023SatApr 1Earth HourWorldwide observance
2024SatMar 23Earth HourWorldwide observance
2025SatMar 22Earth HourWorldwide observance
2026SatMar 28Earth HourWorldwide observance
2027SatMar 27Earth HourWorldwide observance
2028SatApr 1Earth HourWorldwide observance
2029SatMar 31Earth HourWorldwide observance

While we diligently research and update our holiday dates, some of the information in the table above may be preliminary. If you find an error, please let us know.