Winter 2024 Start Date.  — in 2024, the first day of fall, also known as the autumnal equinox, is sunday, sept.  — 2024 fall 2024 winter 2024 spring 2025 summer 2025;

 — 2024 fall 2024 winter 2024 spring 2025 summer 2025; Seasons divide the year into four distinct periods of time named spring, summer, autumn/fall, and winter.