When Does Spring Start Uk 2024. This year, the spring equinox falls on wednesday 20 march, and the astronomical spring lasts until the summer solstice. The autumn or fall equinox signals the end of summer on the astronomical calendar.

But did you know there are actually three main definitions for the season coming from astronomy, meteorology and phenology? The astronomical spring will then last until the summer solstice, which this year lands on thursday 20 june 2024 at 4.50pm eastern time.