Earth Hour 2031 Countdown

When is Earth Hour 2031?

Earth Hour 2031 is counted down to Saturday, March 29, 2031 at 12:00 AM UTC. The canonical URL keeps the year in the path, so Earth Hour 2031 and Earth Hour 2032 are separate target-date pages.

Plan across time zones

• Earth Hour uses the last saturday in march rule.
• Publish local event times, venue details, and campaign cutoffs separately from the public date.
• Use UTC as the canonical event timezone for this countdown.