First Day Of Summer 2025 Calendar Date Range

First Day Of Summer 2025 Calendar Date Range. Summer begins with the solstice on thursday, june 20, 2024, marking the astronomical first day of summer in the northern hemisphere. Discover our 2025 interactive calendar with all key dates and holidays.

Summer 2025 starts on friday, 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 reached its furthest tilt and begins to change directiion back. The table below will allow you to view the summer start and end dates for the years 2024, 2025 and 2026.