When Is The First Day Of Fall 2025 Canada. This is determined by the autumnal equinox, the point in the earth's orbit when the sun crosses the celestial equator,. This is the first day of astronomical summer and occurs as the sun reaches its most.

In canada, the observance of the beginning of fall is often marked by engaging in outdoor activities to enjoy the vibrant display of foliage colors. Here are the key dates for fall and winter 2025 in canada: