When Does Spring — Start ((free))

For biologists, ecologists, and gardeners, spring doesn't start on a date at all—it starts when living things say it does. This is called (the study of cyclic natural events).

Meteorological spring ignores the actual position of the sun. On March 1, winter may still have a firm grip on northern states, while southern regions feel like early summer.

Climate change is dramatically shifting phenological spring. Many plants now bloom weeks earlier than they did 50 years ago, creating a mismatch with pollinators and migratory birds.

Spring technically has two different start dates: for meteorologists and around March 20 for astronomers.

Because Earth’s orbit is not perfectly uniform, the exact time of the equinox can vary by a day or two, and the amount of daylight isn’t perfectly equal at all latitudes.

For biologists, ecologists, and gardeners, spring doesn't start on a date at all—it starts when living things say it does. This is called (the study of cyclic natural events).

Meteorological spring ignores the actual position of the sun. On March 1, winter may still have a firm grip on northern states, while southern regions feel like early summer.

Climate change is dramatically shifting phenological spring. Many plants now bloom weeks earlier than they did 50 years ago, creating a mismatch with pollinators and migratory birds.

Spring technically has two different start dates: for meteorologists and around March 20 for astronomers.

Because Earth’s orbit is not perfectly uniform, the exact time of the equinox can vary by a day or two, and the amount of daylight isn’t perfectly equal at all latitudes.