47 Surprising Spring Facts About Weather, History, & Nature

By Karin Lehnardt, Senior Writer—Reviewed for accuracy by the FactRetriever editorial team

Published January 10, 2017Updated March 1, 2026

Spring isn’t just flowers, sunshine, and pastel holidays. It’s a season of astronomical precision, biological upheaval, ancient rituals, mental health spikes, animal migrations, and some truly strange myths. From why suicide rates rise in late spring to how Mayan pyramids align with the equinox, these surprising spring facts reveal what’s really happening when winter fades.

The Planet Literally Tilts Into Spring

The first day of spring is called the vernal equinox.
The term vernal is Latin for “spring” and equinox is Latin for “equal night.”_[20]
Day and night are nearly equal worldwide on the equinox
This happens because Earth’s 23.4° tilt is positioned so neither hemisphere leans toward the sun._[20]
Spring almost always arrives on March 20 or 21
Sometimes it arrives on the 19th. The reason the equinoxes and solstices don’t always come on the same day is that Earth doesn’t circle the sun in exactly 365 days. Earth’s orbit takes 365.2422 days, which is why leap years are necessary._[13]
Rethinking the "Spring Equinox"
Some scientists and activists prefer calling the vernal equinox the March Equinox or Northward Equinox to avoid Northern Hemisphere bias and make the term globally inclusive._[20]
Spring happens because of the Earth's tilt and orbit
The vernal equinox happens because Earth’s axis is tilted 23.4º relative to its orbit._[20]
The fall and spring equinoxes are the only two times during the year when the sun rises due east and sets due west
On these two days each year, the tilt of Earth’s axis aligns so perfectly that the sun appears to rise exactly in the east and set exactly in the west._[20]
Spring Changes Human Behavior

Spring is breakup season
According to a Facebook study, couples are most likely to break up in the spring and two weeks before Christmas. The lowest breakup time was Christmas Day and from August through October._[17]

They are, however, less likely to develop allergies

Spring babies face slightly higher health risks
Some studies have found slightly higher rates of certain mental health conditions among people born in spring, such as schizophrenia, bipolar disorder, major depression, and anorexia._[6]
Spring fever is real
Increased sunlight affects serotonin, melatonin, and dopamine levels._[5]
Suicide rates peak in the spring
Contrary to popular belief, rates are highest in April and May._[11]
Allergies affect over 50 million Americans each year
Spring pollen is a major trigger._[1]
Studies show that there is regular seasonal variation in sperm quality
Specifically, sperm concentration was highest in the spring and lowest in the autumn._[4]
Spring Brings More MS Relapses
Research suggests multiple sclerosis relapses peak in spring and are least common in fall, possibly linked to changing sunlight, vitamin D levels, and seasonal infections._[6]
A National Academy of Sciences study found that babies conceived in the spring are more likely to be premature
Scientists hypothesize that their mothers were nearing full term in January and February when seasonal flu cases spike, and pregnant women who contract the flu in the 2nd and 3rd trimesters have a slightly increased risk of premature labor._[10]
Nature Goes Into Overdrive

Spring migration is impressive
Birds return from their winter homes, and honeybees swarm to start new colonies. While some people prefer not to feed birds in spring and summer, during the spring migration, a feeder might be a useful source of food for traveling birds._[14]

Just don't forget to clean your bird feeders

Birds sing more in spring
Spring is mating season, so expect more singing as males attract mates and warn rivals._[14]
The first spring flowers appear
These are typically lilacs, irises, lilies, tulips, daffodils, and dandelions._[14]

She turned to the sunlight /And shook her yellow head / And whispered to her neighbor / 'Winter is dead.'

- A.A. Milne, When We Were Very Young

Honeybees are more likely to swarm during the spring
They swarm as a way to start new colonies from successful ones. Surprisingly, swarming honeybees are very docile and the most friendly they will ever be all year._[18]
Some animals change color or behavior in the spring
Arctic foxes, hares, and ptarmigans turn white in winter and revert to brown or gray for spring._[12]
Monarch butterflies travel huge distances
Millions fly 50–100 miles per day to reach warmer climates for winter and return in spring._[9]
Opposite Seasons, Same Day
When the Southern Hemisphere welcomes spring, the Northern Hemisphere is entering fall, a reminder that the Earth’s tilt flips the seasons between north and south._[14]
Two Ways to Start Spring
Spring can begin astronomically on March 20–21 with the equinox, or meteorologically on March 1, when average temperatures start rising in many regions._[20]
Tornado season peaks in spring
Warmer air colliding with lingering cold systems creates instability._[17]
Ancient Spring Traditions & History

Nowruz marks the Persian New Year on the spring equinox
The celebration dates back more than 3,000 years._[16]

Some Baltic and Slavic countries burn an effigy of winter as a way to welcome spring

Effigies of winter are burned in Poland
This centuries-old tradition bids farewell to winter and welcomes spring._[16]
The Mayan pyramid at Chichen Itza aligns with the equinox
A shadow illusion creates the appearance of a descending serpent._[16]
Groundhog Day has pagan roots
The day has its roots in the Neolithic Celtic festival of Imbolc, which marks a seasonal turning point and also involved animal prognostication._[16]

In the Eleusinian Mysteries, Persephone's return from the underworld each spring is a symbol of immortality, and she was frequently represented on sarcophagi

Persephone returns from the underworld
In Greek mythology, spring coincides with Persephone’s return from Hades, symbolizing fertility and rebirth._[16]
Spring tides are unrelated to the season
A “spring tide” has nothing to do with the season of spring. Rather, it connotes a “springing forth.” Spring tides happen twice each lunar month all year long, regardless of the season._[14]
Cultural & Calendar Facts About Spring

Several holidays occur in spring
Holidays include Easter, Passover, April Fool’s Day, Earth Day, Arbor Day, Mother’s Day, Father’s Day, Cinco De Mayo, and Holi (festival of colors in India)._[16]
The Spring Equinox Egg Myth
Despite popular belief, you can’t magically balance an egg on its end during the spring equinox; it’s no easier than any other day of the year!_[20]
Between 1.5 And 2 Million Students Travel For Spring Break Each Year
Every year, millions of American college students leave campus for spring break trips. Altogether, they spend more than $1 billion on travel, hotels, food, and entertainment._[15]
Cherry blossoms signal spring in Japan
The blooming of Japan’s national flower is a seasonal marker celebrated nationwide._[16]
April Fool’s Day may date back to calendar reform in 16th-century France.
While the origins April Fools’ Day are uncertain, some believe it started in 16th century France when the observation of New Year’s changed from April 1st to January 1st. Those who continued to celebrate on April 1st were called “April Fools.”_[3]
Spring in U.S. Pop Culture
In American culture, spring is often seen as stretching from the day after President’s Day to just before Memorial Day, marking the unofficial start of warmer weather, outdoor fun, and seasonal traditions._[16]
The Sphinx Greets the Spring Sun
The Great Sphinx of Egypt was built to face the rising sun on the spring equinox, linking ancient architecture with the rhythms of nature and the changing seasons._[16]

The Great Sphinx aligns with the spring equinox

March is named after Mars, the Roman god of war
In ancient Rome, this month signaled the beginning of warfare season._[7]
Spring: The Hottest Season for Home Sales
Spring isn’t just about flowers. It’s also the busiest season for real estate, with more homes listed, more buyers active, and more deals closing than any other time of year._[2]
Chinese New Year Marks Early Spring
Chinese New Year falls with the arrival of early spring in the Northern Hemisphere, celebrating renewal, new beginnings, and the lunar calendar’s first month._[8]
Seasons Aren’t Always “Spring”
In tropical and subtropical regions, people don’t talk about spring, summer, fall, or winter. Instead, they describe seasons by rain patterns like wet vs. dry or monsoonal and cyclonic periods._[16]
Why Easter Moves Every Year
Easter isn’t fixed on the calendar. It always falls on the first Sunday after the first full moon following the spring equinox, which is why its date changes every year._[20]
The word “season” is from the Latin sationem meaning “sowing” or “seed time"
A reminder that our calendars were once tied to planting and harvesting cycles._[14]
Climate & Environmental Changes

Climate change is shifting spring earlier
Studies in Colorado show spring now arrives on average three weeks earlier than in the 1970s._[13]
Spring Is Arriving Early, But Migratory Birds Aren’t
As temperatures rise, insects hatch and plants bloom earlier, but many migratory birds rely on day length, not temperature, to time their journeys. The result? They can arrive too late for peak food supplies, putting pressure on breeding success and survival._[14]
Tree pollen seasons are lasting longer than in previous decades
Tree pollen seasons now start earlier, last longer, and release more pollen than they did decades ago, largely due to rising temperatures and higher CO₂ levels. For millions of people, that means allergy season isn’t just bad. It’s getting longer every year._[9]
Snowmelt Timing Controls the Water Supply of Over a Billion People

Mountain snow isn’t just scenery; it’s a natural water reservoir. When it melts earlier due to warming temperatures, water runs off too soon, increasing the risk of summer shortages for millions (even over a billion) people worldwide.
In short: When snow melts changes how the world drinks._[19]
Why Spring Feels So Different

Spring represents biological reset, agricultural rebirth, astronomical precision, and deep cultural symbolism.

It is one of the few seasons that affects:

Hormones

Migration patterns

Religious holidays

Mental health statistics

Real estate markets

Ancient monuments
Few times of year touch as many systems at once.
_[14]