Winter countdown and date guide
Astronomical winter begins in the Northern Hemisphere at the December solstice, the shortest day and longest night of the year, which happens at a precise instant.
Whether you search “how many days until Winter” or “how many days till Winter”, both point to the same next date shown above.
What is Winter?
The first day of winter is set by the December solstice, when Earth’s axial tilt leans farthest from the Sun in the Northern Hemisphere. It marks the astronomical start of winter there and summer in the Southern Hemisphere.
The solstice happens at a single global instant, so the calendar day can be December 21 or 22 depending on your time zone. This page uses the precise UTC instant (from USNO data) and the live countdown converts it to your local time. Meteorological winter, used by some forecasters, instead starts on December 1.
Why use a Winter countdown?
The date is useful for seasonal planning, photography of low daylight, science lessons and tracking the shortest days of the year.
How people observe it
- Seasonal and solstice festivals
- Winter photography and stargazing
- Astronomy and science education
Planning checklist
- Confirm the local time by converting from UTC
- Plan around the shortest daylight hours
- Choose activities for the correct hemisphere
How the date is determined
The first day of astronomical winter is the December solstice, a precise instant that changes each year. This page uses verified UTC times converted to your local time zone.
Frequently asked questions
When does winter start?
Astronomical winter starts at the December solstice, which falls on December 21 or 22 depending on your time zone. Meteorological winter, used by some forecasters, begins on December 1.
Is the first day of winter always December 21?
No. The solstice is a single global instant, so the local calendar day can be December 21 or 22 depending on your time zone.
Is it the shortest day everywhere?
It is the shortest daylight period in the Northern Hemisphere and, on the same date, the longest in the Southern Hemisphere, where it marks the start of summer.
How is the exact start time determined?
This page uses the precise December solstice instant published by the US Naval Observatory (USNO) and converts it to your browser’s local time zone.
Is the solstice the same as the coldest day?
No. Peak cold usually lags the December solstice by weeks because land and oceans keep losing heat well after daylight starts lengthening again.