What Is The First Day Of Winter 2025 In Canada. The winter solstice, which marks the first day of winter 2025, occurs on saturday, december 21, 2025 at 4:21 a.m. Instead, it was the warmest winter on record for the country.
Saturday, december 21, 2025 this marks the shortest day and longest night of the year in the northern hemisphere. Falls on december 21st, marking the winter solstice, when the northern hemisphere tilts farthest from the sun.