Earth Hour 2027
A worldwide movement in which people switch off non-essential lights for one hour as a symbol of commitment to the planet.
Quick facts
- Date
- Last Saturday of March
- Day of the week
- Saturday in 2027
- Type
- Awareness
- Observed in
- Global
- First observed
- 2007
- Established by
- WWF and partners in Sydney, Australia
- Led by
- WWF
- Observed by
- 8:30 p.m. to 9:30 p.m. local time
- Hashtag
- #EarthHour
Overview
Earth Hour takes place on the last Saturday of March, usually from 8:30 p.m. to 9:30 p.m. local time. Homes, businesses and famous landmarks switch off non-essential lights to show support for action on nature and climate.
The hour is symbolic: its purpose is to start conversations and encourage lasting changes, not only to save one hour of electricity.
History
Earth Hour began in Sydney, Australia, in 2007, when WWF and partners asked residents and businesses to turn off their lights for one hour. The idea spread quickly; within a few years it had become a global event, with landmarks such as the Eiffel Tower, the Sydney Opera House and the Empire State Building going dark.
- 2007The first Earth Hour is held in Sydney.
- 2008Earth Hour goes global, with cities on several continents taking part.
How to celebrate
Switch off for an hour
Turn off non-essential lights and devices at 8:30 p.m. local time.
Look at the stars
Use the darker sky to stargaze with family or friends.
Host a candle-light gathering
Share stories, play board games or enjoy acoustic music.
Make a lasting change
Pick one habit to keep — switching to efficient bulbs, or turning off standby power.
Wishes and messages
Greeting card
A 1080 × 1080 image, ready for WhatsApp, Facebook and Instagram.
Social media captions
Switching off for the planet tonight. 🌍 #EarthHour
60 minutes, one Earth.
Candles, stars and good company. 🕯️
Earth Hour dates
| Year | Date | Day of the week | Days from today |
|---|---|---|---|
| 2026 | March 28 | Saturday | Passed |
| 2027 | March 27 | Saturday | 144 |
| 2028 | March 25 | Saturday | 508 |
| 2029 | March 31 | Saturday | 879 |
| 2030 | March 30 | Saturday | 1,243 |
| 2031 | March 29 | Saturday | 1,607 |
Frequently asked questions
When is Earth Hour?
On the last Saturday of March, usually from 8:30 p.m. to 9:30 p.m. local time.
Who started Earth Hour?
WWF and partners, in Sydney, Australia, in 2007.
Does Earth Hour save energy?
Some electricity is saved, but the main aim is symbolic — to inspire longer-term action for nature and climate.
Last updated November 2, 2026