Shortest Day 2025 Sunset Date. However, as you can see below the 21st is by far the most common. Winter solstice is the shortest day of year, longest night of the year and the official first day of winter in the northern hemisphere.

The shortest day of the year, also known as the winter solstice, occurs on december 21st or 22nd in the northern hemisphere. In the northern hemisphere, the shortest day of the year 2025 will occur on december 21.