when do spring start

Spring can “start” on two different dates, depending on which definition you use:

• Astronomical spring (most common definition):
  In the Northern Hemisphere, spring starts at the March (vernal) equinox , which in 2026 falls on Friday, March 20.

• Meteorological spring (used by many weather services):
  This defines spring as the calendar months March, April, and May , so meteorological spring starts on March 1 in the Northern Hemisphere.

So if you’re asking “when do spring start” in the usual calendar/holiday sense, most people mean the spring equinox around March 20 (March 20, 2026 specifically in many places in the Northern Hemisphere).

Note: In the Southern Hemisphere, “spring” is flipped and usually runs from September to November , starting around the September equinox instead.

Information gathered from public forums or data available on the internet and portrayed here.