When Do Fall Leaves Change Colors?

The Old Farmer’s Almanac. Nature is so fascinating! The main reason for the eye-popping color change is not autumn’s chilly weather, but sunlight—or rather, the lack of daylight. Day and night are roughly equal in length on the autumnal equinox in late September, but afterward, nights are growing longer and days shorter. George and Becky Lohmiller  May 31, 2023