What Day Is The Summer Solstice 2025 Game. The first day of summer this year is thursday, june 20, 2025, per the almanac. The first day of winter is marked by the winter solstice, which occurs when the earth’s axis tilts farthest from the sun.

Is the solstice the longest day of the year?—and more! The first day of winter is marked by the winter solstice, which occurs when the earth’s axis tilts farthest from the sun.