Last Day Of Summer 2025 Calendar. Payments of tuition and fees accepted for for all sessions (t1, s1, s2, s3, and s4). The astrological equinox is when the sun passes over the equator in a southward direction.

Here are the equinox and solstice dates—plus, answers to common questions about the seasons of the year in north america. Last day to satisfy incomplete grades earned in spring 2025 and summer 2025 (all sessions).