Autumn Equinox 2024 Pagan Calendar. The spring equinox, or ostara, occurs in march and marks the beginning of spring, while the fall equinox, or mabon, occurs in september and marks the beginning of autumn. Spring, summer, autumn & winter, and the festivals that celebrate our connection.

When is the autumn equinox in 2024? Mabon 2024 will occur on sunday, september 22, at 8:44 am edt, aligning with the autumn equinox.