The first day of spring is Thursday. The spring equinox will occur at 5:01 a.m. EDT on Thursday. An equinox occurs when the Earth's equator aligns with the sun, resulting in a "nearly" equal ...

This year's first day of spring in the Northern Hemisphere occurs precisely at 5:01 a.m. EST on March 20, according to NASA. The date and time of the equinox varies slightly from year to year.

Meteorologists consider March 1 the official first day of spring, and the season lasts until May 31. This is based on annual temperature cycles rather than the Earth's position in relation to the sun.