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.
Home Sun, Moon & Space Seasons
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Current Season
Summer 2025
Start (June solstice)21 Jun 09:42Duration 93 days, 15 hrs, 37 mins -
Next Season
Autumn 2025
Start (September equinox)23 Sep 01:19Duration 89 days, 20 hrs, 43 mins -
Winter 2025-2026
Start (December solstice)21 Dec 22:03Duration 88 days, 23 hrs, 42 mins -
Spring 2026
Start (March equinox)20 Mar 21:46Duration 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 Vientiane.
Solstices & Equinoxes for Vientiane
| Year | March equinox | June solstice | September equinox | December solstice | ||||
|---|---|---|---|---|---|---|---|---|
| 2020 | Mar 20 | 10:49 am ICT | Jun 21 | 4:43 am ICT | Sep 22 | 8:30 pm ICT | Dec 21 | 5:02 pm ICT |
| 2021 | Mar 20 | 4:37 pm ICT | Jun 21 | 10:32 am ICT | Sep 23 | 2:21 am ICT | Dec 21 | 10:59 pm ICT |
| 2022 | Mar 20 | 10:33 pm ICT | Jun 21 | 4:13 pm ICT | Sep 23 | 8:03 am ICT | Dec 22 | 4:48 am ICT |
| 2023 | Mar 21 | 4:24 am ICT | Jun 21 | 9:57 pm ICT | Sep 23 | 1:50 pm ICT | Dec 22 | 10:27 am ICT |
| 2024 | Mar 20 | 10:06 am ICT | Jun 21 | 3:50 am ICT | Sep 22 | 7:43 pm ICT | Dec 21 | 4:20 pm ICT |
| 2025 | Mar 20 | 4:01 pm ICT | Jun 21 | 9:42 am ICT | Sep 23 | 1:19 am ICT | Dec 21 | 10:03 pm ICT |
| 2026 | Mar 20 | 9:46 pm ICT | Jun 21 | 3:24 pm ICT | Sep 23 | 7:05 am ICT | Dec 22 | 3:50 am ICT |
| 2027 | Mar 21 | 3:24 am ICT | Jun 21 | 9:10 pm ICT | Sep 23 | 1:01 pm ICT | Dec 22 | 9:42 am ICT |
| 2028 | Mar 20 | 9:17 am ICT | Jun 21 | 3:02 am ICT | Sep 22 | 6:45 pm ICT | Dec 21 | 3:19 pm ICT |
| 2029 | Mar 20 | 3:02 pm ICT | Jun 21 | 8:48 am ICT | Sep 23 | 12:38 am ICT | Dec 21 | 9:14 pm ICT |
| 2030 | Mar 20 | 8:51 pm ICT | Jun 21 | 2:31 pm ICT | Sep 23 | 6:26 am ICT | Dec 22 | 3:09 am ICT |
| * All times are local time for Vientiane. Dates are based on the Gregorian calendar. Times adjusted for DST if applicable. Current year is highlighted. | ||||||||
The Seasons Calculator shows the times and dates of Vernal (Spring) & Autumnal (Fall) equinoxes and Summer and Winter solstices all over the world.
Learn more about equinoxes and solstices
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.
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