When Does Summer Start 2025 Usa Dates. Summer solstice 2025 (beginning of astronomical summer) on the day of the summer (june) solstice, the solar disk, moving along the ecliptic, will fall into its northernmost point and will be. The first day of summer this year is thursday, june 20, 2025, per the almanac.

It’s the longest day of the year and follows father’s day and. The first day of summer in north america is thursday, june 20, 2025.