Start Of Spring 2024 Uk Time. When is the first day of spring 2024? The spring equinox begins on march 20, which is the first day of astronomical spring.

In the uk the clocks go forward 1 hour at 1am on the last sunday in march, and back 1 hour at 2am on the last sunday in october. The clocks spring forward in march to mark the beginning of british summer time, which means we’ll lose one hour of sleep.