Spring is often seen as a time for new beginnings. The days become longer, the weather feels warmer, and nature starts to wake up. However, looking at a calendar can sometimes be confusing. You might notice two different dates listed for the start of the season.
One date is based on the calendar months, while the other depends on the Earth’s position in relation to the sun. This creates two separate definitions: meteorological spring and astronomical spring.
Understanding the difference helps you know exactly when to expect the change in seasons. This guide explains when meteorological spring 2026 begins and why we use two different systems to measure the year.
The difference between meteorological and astronomical spring
To make sense of the seasons, scientists and astronomers use different methods. This is why you will see different start dates depending on who you ask.
Meteorological spring
Meteorologists and climatologists define seasons based on the annual temperature cycle. They divide the year into four seasons, with each season lasting exactly three months. This system aligns perfectly with the Gregorian calendar (the calendar we use every day).
Because this system is based on full months, the dates remain the same every year. In the Northern Hemisphere, meteorological spring always follows this schedule:
- Starts: 1 March
- Ends: 31 May
For 2026, meteorological spring begins on Sunday, 1 March 2026.
Astronomical spring
Astronomical seasons are likely what you learned about in school. This definition is based on the Earth’s tilt and its orbit around the sun. The season begins on the vernal equinox. This is the moment when the sun passes directly over the equator, making day and night roughly equal in length.
Because the Earth does not orbit the sun in exactly 365 days, the date of the equinox shifts slightly from year to year. It usually falls on 20 March or 21 March.
For 2026, astronomical spring begins on Friday, 20 March 2026.
Why do we reference meteorological spring?
You might wonder why we need two definitions. While the astronomical date is tied to the movement of our planet, the meteorological date serves a more practical purpose for researchers and planners.
Consistent weather recording
Meteorologists monitor weather patterns over long periods. To do this accurately, they need to compare statistics from one year to the next.
If the start date of spring changed every year—even by just a day or two—it would make it very difficult to compare seasonal averages for temperature and rainfall. By starting spring on 1 March every single year, scientists ensure that their data is consistent. This helps them track climate trends with greater accuracy.
Simpler planning for media and business
The media, civil planners, and gardeners often rely on meteorological spring because it is easier to manage.
Breaking the year into clear three-month blocks helps businesses organise their quarters. It helps the media communicate clear forecasts to the public. For example, when a TV weather presenter talks about the “first day of spring” on 1 March, they are using the meteorological definition. It signals a shift in typical weather patterns, even if the astronomical equinox is still a few weeks away.
Frequently Asked Questions
When does spring 2026 officially start?
It depends on which definition you follow. Meteorological spring starts on Sunday, 1 March 2026. Astronomical spring starts on Friday, 20 March 2026. Both are considered correct in their own context.
Is meteorological spring the same length every year?
Yes. Because it covers the months of March, April, and May, the length of meteorological spring is constant (92 days). This consistency is the main reason scientists prefer it.
Which definition should I use for gardening?
Most gardeners pay attention to the weather rather than the exact date. However, meteorological spring is a useful guide. The start of March often signals that the soil is beginning to warm up, though you should always check your local frost forecast before planting.
Looking forward to the season
Whether you mark your calendar for the first of March or wait for the equinox later in the month, spring 2026 is on its way. Understanding the difference between these dates simply gives you a better insight into how we track time and weather.
Meteorological spring offers a clear and simple schedule for the changing seasons. It marks the time when we can confidently look forward to brighter days and warmer weather.