While temperatures are heating up and desert flowers are starting to bloom, astronomical spring won't start until later in the month.

The spring 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 ...

Don’t be fooled: we still have a couple weeks to go. What’s the first day of spring? The first day of spring falls on the spring equinox, which happens every year on March 19, 20, or 21.