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Earth Hour

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

Paper doll people in shades of blue link hands while standing on top of the world
It's time to switch off the lights during Earth Hour.
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 towards 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 8.30pm (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 mililon 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

WeekdayDateYearNameHoliday Type
SatMar 272010Earth HourWorldwide observance
SatMar 262011Earth HourWorldwide observance
SatMar 312012Earth HourWorldwide observance
SatMar 232013Earth HourWorldwide observance
SatMar 292014Earth HourWorldwide observance
SatMar 282015Earth HourWorldwide observance
SatMar 192016Earth HourWorldwide observance
SatMar 252017Earth HourWorldwide observance
SatMar 242018Earth HourWorldwide observance
SatMar 302019Earth HourWorldwide observance
SatMar 282020Earth HourWorldwide observance

Quick Facts

Earth Hour is an annual event in which many people worldwide turn their lights off on the last Saturday in March.

Earth Hour 2018

Saturday, March 24, 2018

Earth Hour 2019

Saturday, March 30, 2019


Name in other languages

Earth HourEnglish
La Hora del PlanetaSpanish
שעת כדור הארץHebrew
ساعة الأرضArabic
지구의 시간Korean
Earth hour / Jordas timeNorwegian
Earth HourGerman

List of dates for other years

United Nation Holidays on March 24, 2019

Fun Holiday on March 24, 2019

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