We’re starting to see a few flowers poke through the ground and the switch to daylight saving time is just around the corner.

Looks like Easter – the day that celebrates Christ’s resurrection from the grave following his crucifixion – is almost here.

Easter 2024 is on Sunday, March 31. It will be later – April 20 and April 5, respectively, in 2025 and 2026 before slipping back to March 28th in 2027. The earliest Easter can happen is March 22, but we won’t see that again until 2285. The latest Easter can take place is April 25, something that hasn’t occurred since 1943.

Unlike holidays such as Christmas or Halloween that fall on set days each year – Dec. 25 and Oct. 31, respectively – the date of Easter changes each year and it all has to do with the first full moon of spring.

How do we determine the date of Easter?

Easter always occurs on the first Sunday after the “Paschal Full Moon,” the name given to the first full moon to occur after the spring equinox,according to the Farmer’s Almanac. Though the equinox’s exact date varies each year, the church always recognizes it as March 21, so you look for the first full moon after that date.

On years when the first full moon of spring falls on a Sunday, Easter is observed the following week.

Over 500 years from 1600 to 2099, the dates Easter has most often been celebrated are on March 31 and April 16th.

Want to take a deeper dive? LiveScience has all you need to know here.