Earth Hour 2025 Date. Register your interest today and we will be in touch with lots of exciting ways to get involved and resources for everyone to take part to make. Perihelion is when earth is closest to the sun, happening between january 2 and 4.

Earth hour will celebrate a worldwide commitment to ongoing. Let the one hour that is earth hour inspire you to make the world a better place for the remaining 8,760 in the year!