When Is Summer 2025. The same is true for summer vacations in 2025. 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.

138 rows united states 2025 holiday calendar with all major holidays and observances. This year is an opportunity to celebrate our achievements, learn from our past, and.