Summer 2024 Date Usa. This is the longest day of the year and marks the start of summer in the northern hemisphere. Although often regarded as interchangeable, midsummer is actually a separate event to the summer solstice.
Here are the equinox and solstice dates—plus, answers to common questions about the seasons of the year in north america. This year, the first day of summer, also known as the summer solstice, is thursday, june 20.