Solstices & Equinoxes for Denver (Surrounding 10 Years)

• Current Season

  

  Summer 2025

  Start (June solstice)

  Jun 20 8:42 pm

  Duration 93 days, 15 hrs, 37 mins

• Next Season

  

  Autumn 2025

  Start (September equinox)

  Sep 22 12:19 pm

  Duration 89 days, 20 hrs, 43 mins
• 

  Winter 2025-2026

  Start (December solstice)

  Dec 21 8:03 am

  Duration 88 days, 23 hrs, 42 mins
• 

  Spring 2026

  Start (March equinox)

  Mar 20 8:46 am

  Duration 92 days, 17 hrs, 38 mins

Countries define seasons differently. This calculator refers to astronomical seasons, not meteorological seasons. All times are local time for Denver.

Learn more about equinoxes and solstices

When Does Spring Start?

The first day of spring is at the vernal equinox, when day and night are equal. Find out the exact time and date.

When Does Summer Start?

Find out the exact moment of the summer solstice in both the Northern and Southern Hemispheres—down to the minute.

When Does Fall Start?

North of the equator, fall begins in September. Find out the exact dates for both hemispheres.

When Does Winter Start?

The first day of winter in the Northern Hemisphere is in December; south of the equator, it is in June. Find out exactly when the winter season starts.

March Equinox

At the March equinox, the Sun crosses the equator from south to north. Explanation and 2026 equinox date.

June Solstice 2025

The June solstice is the longest day of the year in the Northern Hemisphere and the shortest day in the Southern Hemisphere.

September Equinox

The Sun shines directly on the Equator on the September equinox and the length of day and night is nearly equal, but not quite.

December Solstice

December solstice marks the shortest day north of the equator and the longest day in the south.