First Day Of Summer 2024 Time Frame. When do the four seasons start in 2024—for spring, summer, fall, and winter? Summer 2024 starts on thursday, june 20th in the northern hemisphere, with the first day of summer being the longest daylight day of the year with the earth's axis having.

When is the first day of summer 2024? The true solstice will arrive in the northern hemisphere at exactly 4:51 p.m.