When Does Summer Start 2025 Usa Dates. When do the four seasons start in 2025—for spring, summer, fall, and winter? Fall begins with the autumnal equinox , monday, september 22, 2025, 2:19 p.m.
The longest day of 2025, also known as the summer solstice, is friday, june 20. This is the longest day of the year and marks the start of summer in the northern hemisphere.
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