When Do The Four — Seasons Start And End

🌍 Note: Dates shift by ~1 day depending on the year and time zone. In the Southern Hemisphere, all seasons are opposite to the North.

1. Astronomical Seasons (based on Earth's position relative to the Sun)

2. Meteorological Seasons (based on annual temperature cycles, simpler for record-keeping)

Key difference: Astronomical seasons vary slightly each year (dates shift by 1–2 days), while meteorological seasons have fixed calendar dates. Most weather forecasts and climate data use the meteorological system.

In the celestial clockwork of our world, the four seasons aren’t just dates on a calendar; they are the rhythmic breathing of the Earth as it tilts toward and away from the sun. The Awakening: Spring

Starts: March 20 or 21 (Vernal Equinox)Ends: June 20 or 21Spring begins at the Equinox, a moment of perfect balance where day and night are equal [1, 2]. It is the Earth’s exhale after a long slumber. This season is a story of resurrection—the sudden greening of the hills, the frantic song of returning birds, and the softening of the soil [3, 4]. It is the brief, fragile window where the world transitions from "surviving" back to "thriving." The Radiance: Summer

Starts: June 20 or 21 (Summer Solstice)Ends: September 22 or 23Summer arrives when the Earth’s tilt toward the sun reaches its maximum, gifting us the longest day of the year [1, 5]. It is the season of abundance and intensity. The story of summer is told in the heavy heat of the afternoon, the drone of cicadas, and the deep, dark greens of full-growth forests [4]. It is a time of outward energy, where life burns at its brightest before the slow cooling begins. The Letting Go: Autumn

Starts: September 22 or 23 (Autumnal Equinox)Ends: December 21 or 22As the sun crosses the equator again, we return to balance, but with a different weight [1, 6]. Autumn is the Earth’s sigh. The story here is one of beautiful surrender. Trees shed what they no longer need, turning their leaves into a final, fiery display of gold and crimson [4, 6]. It is a season of harvest and preparation—a reminder that there is dignity and beauty in endings. The Quiet: Winter

Starts: December 21 or 22 (Winter Solstice)Ends: March 20 or 21Winter begins on the shortest day and the longest night [1, 7]. It is the season of the inward turn. While the surface world seems stark and frozen, the story of winter is actually one of deep, hidden strength. Beneath the frost, life is dreaming and gathering energy [4]. It is a time of silence, starlight, and the necessary rest that makes the coming spring possible.

The start and end dates of the four seasons depend on whether you use the astronomical

definition (based on Earth's position relative to the Sun) or the meteorological

definition (based on the calendar and temperature cycles). Because Earth is tilted, seasons are reversed between the Northern and Southern Hemispheres. The Old Farmer’s Almanac 2026 Seasonal Dates

For the year 2026, the specific astronomical transitions are as follows: Northern Hemisphere (Astronomical) Southern Hemisphere (Astronomical) March 20 – June 20 September 23 – December 21 June 21 – September 21 December 22 – March 19 (2027) September 22 – December 20 March 20 – June 20 December 21 – March 19 (2027) June 21 – September 22 Two Ways to Define Seasons Astronomical Seasons : These are defined by (when day and night are roughly equal) and

(the longest and shortest days of the year). These dates vary slightly each year because the Earth takes about 365.24 days to orbit the Sun. Meteorological Seasons when do the four seasons start and end

: Used by scientists for consistent record-keeping, these split the year into four 3-month periods that always start on the first day of a month. Northern Hemisphere

: Spring (March 1), Summer (June 1), Autumn (Sept 1), Winter (Dec 1). Southern Hemisphere

: Spring (Sept 1), Summer (Dec 1), Autumn (March 1), Winter (June 1). The Old Farmer’s Almanac The Role of Earth's Tilt

Seasons of the Year: When Do They Start and End? - Time and Date

The four seasons are defined by two primary systems—the astronomical calendar, which tracks the Earth's orbit and tilt relative to the sun, and the meteorological calendar, which groups months by annual temperature cycles.

While most of us look for the first day of spring on a calendar, scientists often use whole-month blocks to simplify record-keeping and climate comparisons. 1. Astronomical vs. Meteorological: The Key Differences

The primary reason we have two sets of start dates is the "lag" between celestial events and actual weather.

Astronomical Seasons: These are based on the position of the Earth in its orbit. They begin at the equinoxes (when day and night are nearly equal) and solstices (the longest and shortest days). Because Earth's orbit is elliptical and not exactly 365 days, these dates shift slightly every year.

Meteorological Seasons: To make data gathering consistent, meteorologists divide the year into four three-month periods that align with the Gregorian calendar. For example, meteorological summer always starts on June 1, even if the summer solstice hasn't occurred yet. 2. 2026 Seasonal Dates (Northern Hemisphere)

For the year 2026, the transitions between seasons are scheduled as follows: When Do Seasons Start and End? - Time and Date

The start and end dates of the four seasons depend on whether you use the astronomical

calendar (based on Earth's position relative to the sun) or the meteorological calendar (based on temperature cycles and months).

National Centers for Environmental Information (NCEI) (.gov) Seasonal Breakdown for 2026 The dates below apply to the Northern Hemisphere 🌍 Note: Dates shift by ~1 day depending

. For the Southern Hemisphere, these dates are reversed (e.g., March 20 marks the start of Autumn). Time and Date 1. Astronomical Seasons Astronomical seasons begin at the

. These dates vary slightly each year because Earth's orbit is not a perfect 365 days. Royal Meteorological Society

Seasons of the Year: When Do They Start and End? - Time and Date

The start and end dates of the four seasons depend on whether you follow the astronomical

calendar (based on Earth's position relative to the sun) or the meteorological

calendar (based on the annual temperature cycle and fixed three-month blocks). The Old Farmer’s Almanac 2026 Seasonal Dates (Northern Hemisphere)

For those in the Northern Hemisphere (e.g., North America, Europe, much of Asia), the dates are: Astronomical Dates (2026) Meteorological Dates March 20 – June 20 March 1 – May 31 June 21 – September 21 June 1 – August 31 September 22 – December 20 September 1 – November 30 December 21 – March 19, 2027 December 1 – February 28 2026 Seasonal Dates (Southern Hemisphere)

Seasons in the Southern Hemisphere (e.g., Australia, South America, South Africa) are the opposite of the Northern Hemisphere. Time and Date

Meteorological and Astronomical Seasons: Southern ... - NOAA

When the four seasons start and end depends on whether you follow the stars or the thermometer. There are two primary systems used to define these dates: the astronomical calendar and the meteorological The Old Farmer’s Almanac 1. Astronomical Seasons (Celestial Alignment)

The astronomical seasons are dictated by the Earth's position relative to the Sun, specifically marked by two (when day and night are nearly equal) and two

(the longest and shortest days of the year). Because a full orbit takes approximately 365.24 days, these dates shift slightly each year. in the Northern Hemisphere, the astronomical timeline is: Starts March 20 (Vernal Equinox) and ends June 20. Starts June 21 (Summer Solstice) and ends September 21. Fall (Autumn):

Starts September 22 (Autumnal Equinox) and ends December 20. Differences vs astronomical

Starts December 21 (Winter Solstice) and ends March 19, 2027. The Old Farmer’s Almanac 2. Meteorological Seasons (Temperature Cycles)

Calendar, astronomical and meteorological seasons - MeteoSwiss

The ancient Celts defined seasons based on the solar cross-quarter days (the midpoints between solstices and equinoxes):

This is why, in Ireland, February 1 is often considered the first official day of spring, and November 1 the first day of winter.

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Here’s a clear, helpful guide to when the four seasons start and end, keeping in mind there are two main ways to define them: astronomical (based on Earth’s position relative to the Sun) and meteorological (based on annual temperature cycles for record-keeping).

If you are a gardener, a farmer, a utility company planner, or a public health official, the astronomical seasons are frustrating. Why? Because by the time the winter solstice arrives on December 21, it has already been cold for weeks. Conversely, by the summer solstice on June 21, the hottest weather is often still a month away (due to seasonal lag).

To solve this, meteorologists (and many climatologists) created a simpler, more practical system based on the annual temperature cycle. They split the year into three-month blocks that align with our sensory experience of weather.

Traditional and agricultural calendars

Tropical and monsoon climates

Phenological seasons

Definition

Why they matter

Differences vs astronomical

Implications