Thursday is the first day of spring, or the vernal equinox, in the Northern Hemisphere. During an equinox, the center of the sun is on the same plane as the equator. After the vernal equinox in March, the Northern Hemisphere tilts toward the sun until the June solstice, when the sun begins to migrate back south.

Spring 2025 technically begins at 5:01 a.m. Eastern time that day as the sun moves directly over the Earth’s equator — the central line between the North Pole and the South Pole — bringing almost equal minutes of daylight and darkness all around the globe.

The spring equinox - also known as vernal equinox - marks the first day of spring in the northern hemisphere, according to the Old Farmer's Almanac. It occurs when the sun is directly above the equator, resulting in nearly equal daylight and night hours.

Spring is just around the corner. The first day of spring, which coincides with the spring equinox, falls on Thursday, March 20, this year.

The spring equinox, also known as the vernal equinox, marks the official start of the season, which happens on Thursday, March 20, 2025.

The spring equinox - also known as vernal equinox - marks the first day of spring in the northern hemisphere, according to the Old Farmer's Almanac. It occurs when the sun is directly above the equator, resulting in nearly equal daylight and night hours.

Before winter ends, Californians will have to deal with another change. Clocks will spring forward and we'll lose an hour of sleep.