First Day Of Fall 2024 Canada Time. Winter starts at the moment when the sun is farthest south: As the vibrant hues of summer gradually give way to the rich tones of autumn, gardeners and nature enthusiasts eagerly anticipate the first day of fall.

When do the four seasons start in 2024—for spring, summer, fall, and winter? Thursday, june 20 is the official first day of northern astronomical summer for 2024 — summer solstice — which is the longest day of the year for this half of the planet.