First Day of Spring 2027: Exact Date, Time, and Spring Equinox Guide

The first day of spring 2027 is Saturday, March 20, 2027, marked by the astronomical event known as the March equinox or vernal equinox. Spring 2027 begins on Saturday, March 20, 2027, at 4:25 p.m. EDT (20:25 UTC) — the exact moment of the March equinox.

The Spring equinox 2027 falls at 20:25 UTC on March 20. Meteorologists, by contrast, mark the start of spring three weeks earlier, on Monday, March 1, 2027.

This guide covers the astronomical first day of spring 2027, the competing meteorological definition, exact time-zone conversions, the equinox’s relationship to Daylight Saving Time and Easter, the Southern Hemisphere’s autumn equinox on the same date, and the cultural traditions tied to the season’s start.

When Is the First Day of Spring 2027?

The first day of spring 2027 is Saturday, March 20, 2027, marked by the astronomical event known as the March equinox or vernal equinox.

At this moment, the Sun shines directly over Earth’s equator, equally illuminating the Northern and Southern Hemispheres — one of only two times each year this happens, the other being the September equinox.

The term “equinox” combines the Latin words aequus (equal) and nox (night), referencing the near-equal split of daylight and darkness on this date.

Two distinct definitions of “spring” exist, and they do not share a start date. The astronomical definition — the one tied to the equinox — is based on Earth’s position relative to the Sun.

The meteorological definition, used by the National Weather Service and climatologists, is based on fixed calendar months rather than solar geometry.

What Time Does the First Day of Spring 2027 Begin in Every U.S. Time Zone?

The first day of spring 2027 begins at 4:25 p.m. Eastern Daylight Time, with the exact local time varying by time zone.

Daylight Saving Time in the United States begins on Sunday, March 14, 2027 — six days before the equinox — so all four contiguous U.S. time zones will already be on daylight time when the equinox occurs.

First Day of Spring 2027 Time Zone Conversion Table

Arizona is a notable exception among Mountain time-zone states: it does not observe Daylight Saving Time, so most of the state remains on Mountain Standard Time (UTC−7) year-round.

On March 20, 2027, Phoenix experiences the equinox at 1:25 p.m., the same clock time as Pacific Daylight Time, not Mountain Daylight Time.

The United Kingdom and most of continental Europe are also unaffected by any spring clock change at this point, because British Summer Time and Central European Summer Time both begin on the last Sunday in March — March 28, 2027, eight days after the equinox.

Does the Equinox Happen at the Same Instant Everywhere on Earth?

Yes. The equinox is a single, simultaneous global event — the moment the center of the Sun crosses the celestial equator — not a phenomenon that occurs at different times for different regions.

Only the local clock reading changes, based on each location’s time-zone offset from UTC. This is why the equinox falls on Saturday, March 20 across the Americas and Europe but on Sunday, March 21 in Australia: the underlying instant, 20:25 UTC, is identical everywhere; the calendar date attached to it depends solely on how far a given time zone sits ahead of or behind UTC.

Astronomical Spring vs. Meteorological Spring: Two Different Start Dates

Astronomical spring and meteorological spring are not the same season. Astronomical spring 2027 begins Saturday, March 20, and ends Monday, June 21, 2027, with the June solstice — a span of 93 days determined by Earth’s tilt and orbital position.

Meteorological spring 2027 begins Monday, March 1, and ends Monday, May 31, 2027 — a fixed 92-day span covering three complete calendar months.

Why Meteorologists Use March 1 as the Start of Spring

Meteorologists define spring by the calendar month rather than the equinox because fixed, equal-length seasons simplify climate record-keeping and season-to-season temperature comparisons.

Splitting the year into four three-month blocks — spring (March–May), summer (June–August), fall (September–November), and winter (December–February) — produces consistent statistical boundaries every year. In contrast, equinox and solstice dates drift by a day or more depending on leap-year timing.

Why the Equinox Date Moves Between March 19 and March 21

The equinox date shifts because Earth’s orbit takes approximately 365.2422 days to complete, not exactly 365.

The Gregorian calendar’s leap-year system resets this drift periodically, which is why the March equinox can fall on March 19, 20, or 21 depending on the year, and why the last UTC-based March 21 equinox occurred in 2007, with the next not due until 2101.

Locations in the mainland United States, which sit behind UTC, have not observed a March 21 equinox at all during the 21st century, and March 19 equinoxes become more frequent in U.S. time zones during leap years A concrete example: while the equinox remains a March 20 event in UTC terms through at least 2030, the 2028 equinox — which falls at 02:17 UTC — converts to 10:17 p.m.

Eastern Daylight Time on March 19, 2028, making it a March 19 equinox for anyone on U.S. Eastern Time. This directly illustrates why the “always March 21” rule taught in many schools is outdated.

Is Day and Night Really Equal on the Spring Equinox?

No. Daylight typically runs several minutes longer than nighttime on the day of the equinox, rather than splitting exactly 12 hours and 12 hours.

Most locations on Earth experience slightly more daylight than darkness on the equinox itself, a result of how Earth’s atmosphere and the standard definitions of sunrise and sunset work.

The true day of equal daylight and darkness — called the equilux — falls on a different date than the equinox.

What Is the Equilux, and How Does It Differ From the Spring Equinox?

The equilux is the calendar date on which daytime and nighttime are actually equal to within a few minutes, and in the Northern Hemisphere it typically falls several days before the March equinox rather than on it.

This gap exists for two combined reasons: atmospheric refraction bends sunlight near the horizon, making the Sun visible slightly before it geometrically rises and after it geometrically sets, and sunrise/sunset times are measured from the top edge of the Sun’s disc rather than its center, while the equinox itself is defined by the Sun’s center crossing the equator.

The exact equilux date varies by latitude — locations closer to the poles see a wider gap between equilux and equinox than locations near the equator — so no single date applies globally; at most U.S. and European mid-latitudes, it generally lands within about a week before the equinox.

This distinction matters for one specific reason: content claiming that “day and night are exactly equal everywhere on the equinox” is technically inaccurate, even though it is one of the most commonly repeated claims about the March equinox.

Spring 2027 Key Dates: Daylight Saving Time, Easter, and the Full Worm Moon

Several notable dates cluster around the first day of spring 2027, and they are frequently confused with one another or assumed to be linked when they are calculated independently.

Daylight Saving Time and Spring 2027: A Separate Event From the Equinox

Daylight Saving Time in the United States begins on Sunday, March 14, 2027, when clocks move forward one hour from 2:00 a.m. to 3:00 a.m. local time — six days before the equinox, not on the same day.

The two events are governed by entirely different mechanisms: DST is a fixed legal rule (the second Sunday in March, under the Energy Policy Act of 2005), while the equinox is an astronomical event whose date shifts independently.

Their proximity on the calendar each year is coincidental, not causal, despite frequent conflation between the two.

Easter 2027 and the Paschal Full Moon Connection

Easter 2027 falls on Sunday, March 28, 2027, determined by its relationship to the first day of spring rather than a fixed calendar date. Easter’s date is set by the Computus, the traditional method for calculating it each year.

Under this system, Easter is the first Sunday after the first full moon that falls on or after the vernal equinox — a moon traditionally called the Paschal Full Moon.

In 2027, that full moon is the March Full Moon, popularly known as the Worm Moon, which reaches peak illumination on Monday, March 22, 2027, at approximately 6:43 a.m. Eastern Daylight Time.

Because this Full Moon occurs on or after March 21, it also serves as that year’s Paschal Moon; in some years the Paschal Moon is instead the following month’s Full Moon, the Pink Moon Counting forward from the Worm Moon on Monday, March 22, the first Sunday is March 28 — matching the confirmed Easter date and directly explaining why Easter falls so close to the start of spring in 2027.

Spring in the Southern Hemisphere: Why March 20, 2027 Marks Autumn, Not Spring

March 20, 2027 is the autumn equinox in the Southern Hemisphere, not the spring equinox. The same astronomical instant — 20:25 UTC — governs both hemispheres simultaneously; the difference is which season it initiates.

In the Northern Hemisphere, the March equinox brings lengthening days and starts spring; in the Southern Hemisphere, the same event brings shortening days and starts autumn, affecting countries such as Australia, South Africa, Argentina, Brazil, Chile, and New Zealand.

Autumn Equinox 2027 Local Times for Australia, South Africa, and South America

These same countries will mark their own first day of spring roughly six months later, at the September 2027 equinox, when the astronomical relationship reverses.

Cultural and Calendar Significance of the Spring Equinox

The March equinox carries observances that predate the modern calendar and extend across multiple religious, cultural, and astrological traditions, distinct from the Christian and meteorological dates already covered.

Nowruz: The Persian New Year

Nowruz, the Iranian and Persian New Year, is calculated directly from the vernal equinox rather than a fixed date, and in 2027 it coincides with the same astronomical moment as the first day of spring.

The holiday’s 2027 date is tied to the equinox occurring at 20:24 UTC on March 20, which places its local observance on Saturday, March 20, 2027, in Iran (Iran Standard Time, UTC+3:30).

Rooted in Zoroastrian tradition, Nowruz is observed by more than a dozen countries across Central Asia, the Caucasus, and the Middle East, and typically includes the Haft-Seen table — a display of seven symbolic items, each beginning with the Persian letter “S.”

Ostara and the Wiccan Wheel of the Year

Ostara is a modern Pagan and Wiccan Sabbat observed at the spring equinox, marking one of eight festivals in the Wheel of the Year alongside observances such as Beltane, Litha, and Samhain.

It is typically observed on the date of the astronomical equinox itself, March 20, 2027, and traditions associated with it commonly include egg decoration, seed planting, and altar arrangements symbolizing renewal and balance — themes that predate, and likely influenced, several secular spring customs.

The Vernal Equinox in Western Astrology

In tropical Western astrology, the vernal equinox marks the Sun’s ingress into Aries, the first sign of the zodiac, ending the preceding Pisces period. This transition is sometimes referred to informally as the “astrological new year,” since Aries opens the twelve-sign zodiac cycle that the equinox resets annually by definition.

Preparing for Spring 2027: A Practical Checklist

Seasonal preparation tasks cluster around the equinox window even though they are not astronomically determined. This checklist covers general home, garden, and health preparation categories; it does not include hyperlocal frost-date tables or hardiness-zone-specific planting schedules, which vary by region and require location-specific data.

Home and Garden Preparation

Common early-spring maintenance tasks include the following, each tied to the seasonal transition rather than the equinox date itself:

• Inspecting and replacing HVAC air filters before consistent warm-weather use begins
• Testing smoke and carbon monoxide detector batteries, a task frequently paired with the DST clock change on March 14, 2027
• Clearing gutters and downspouts of winter debris ahead of spring rainfall
• Checking the last local frost date before starting outdoor planting, since frost dates vary by USDA hardiness zone and do not align with the equinox
• Inspecting roofing and exterior surfaces for winter weather damage

Seasonal Allergy Preparation

Tree pollen is typically the dominant airborne allergen in temperate regions during the weeks surrounding the equinox, as budding trees begin releasing pollen ahead of grass and weed pollen later in the season.

Common preparation steps include monitoring local pollen forecasts, keeping windows closed on high-pollen days, and laundering bedding more frequently during peak pollen weeks.

Allergy timing and severity vary substantially by region and by year’s weather pattern, so specific pollen counts are not addressed in this guide.

Frequently Asked Questions About the First Day of Spring 2027

Spring Equinox Dates, 2025–2030: Historical and Forward Reference

The 2028 row illustrates the time-zone effect described earlier: although the equinox remains a March 20 event in UTC throughout this six-year window, its Eastern Daylight Time equivalent falls late on March 19, 2028 — a direct, near-term example of the equinox occurring one calendar day earlier for U.S. audiences than the UTC date alone would suggest.