When Do the Seasons Start in the UK? A Clear Guide to Spring, Summer, Autumn and Winter
In the UK, the answer to when do the seasons start depends on which system you are using. That is why people often find themselves asking several slightly different questions at once: when does spring start in the UK, what is the first day of summer, or why do the official seasons not match the calendar quite the way we expect. The short answer is that there is more than one correct answer. The longer answer is far more interesting.
As we are now well into spring in the UK, it is worth starting there. Meteorological spring began on 1 March and runs until 31 May. This is the system used by the Met Office and by climate scientists because it divides the year into four neat three-month blocks, making weather records easier to compare from year to year. Astronomical spring began later, at the spring equinox, which falls around 20 March in the Northern Hemisphere, when day and night are close to equal in length. So, in practical terms, one version of spring had already been under way for nearly three weeks before the other officially began.
That difference explains why many of us feel spring arriving before the equinox. By March, days are already lengthening, bulbs are up, and gardens begin to change. The Met Office notes that spring in the UK often feels calm and dry, with marked differences between daytime and night-time temperatures because the ground has not yet stored much heat from the sun. The Woodland Trust’s Nature’s Calendar project adds another layer, showing that seasonal signs in plants and animals are often arriving earlier than in the past, which means the living world does not always wait politely for a textbook date.
This brings us to a third way of thinking about the seasons: phenological seasons. Phenology is the study of recurring seasonal changes in plants and animals, such as blossom opening, insects emerging, birds nesting or leaves turning. Unlike meteorological or astronomical seasons, phenological seasons are not fixed to a single date. They are observed through nature itself. In Britain, people often recognise early spring through snowdrops, frogspawn, bees and blossom long before the equinox arrives. That makes phenology especially appealing for gardeners, walkers and anyone who pays close attention to the natural world.
So what happens after spring? Meteorological summer always runs from 1 June to 31 August. Astronomical summer begins at the summer solstice, around 21 June, when the Northern Hemisphere is tilted furthest towards the sun. The Royal Observatory notes that this is the longest day of the year, and in the UK it brings roughly 16.5 hours of daylight. For many people, this is the season that feels easiest to recognise because the days are long, gardens are full, and daily life moves more naturally outdoors.
Then comes autumn. Meteorological autumn begins on 1 September and ends on 30 November. Astronomical autumn begins at the autumnal equinox, usually around 23 September. This is the point when summer officially gives way to autumn in astronomical terms. In practice, many people begin to feel autumn much earlier through harvest time, blackberries, shortening days and the first noticeable drop in temperature. Again, nature often signals the shift before the calendar does.
Winter follows the same pattern. Meteorological winter runs from 1 December to 28 or 29 February, depending on the year. Astronomical winter begins at the winter solstice, around 21 or 22 December, which is the shortest day of the year in the Northern Hemisphere. The solstice marks the moment when daylight is at its briefest before beginning, very gradually, to lengthen again. That small shift is often the first quiet sign that the cycle has started to turn back towards spring.
The reason meteorological seasons differ from astronomical ones is practical. Meteorologists need fixed dates for weather analysis. It is far easier to compare March against March, or summer rainfall across identical calendar blocks, than to use equinoxes and solstices that vary slightly from year to year. Astronomical seasons, by contrast, are linked to the Earth’s orbit and axial tilt, so they reflect the movement of the planet rather than the needs of forecasting. Both systems are valid. They simply answer different questions.
For everyday life in the UK, the most useful answer depends on context. If you are asking when does spring start in the UK for weather, gardening or climate comparisons, the answer is likely 1 March. If you are asking from an astronomical point of view, the answer is the spring equinox, around 20 March. If you are asking nature, you may get a different answer again.
There is something reassuring in that. The seasons are not only dates in a diary. They are also shifts in light, weather, behaviour and landscape. Here in the UK, and especially in gardens and countryside settings, like ours at Nynehead Court, we often feel them arriving before we formally name them. Spring has done exactly that this year. It began on paper in early March, announced itself more officially at the equinox, and has already been visible in blossom, birdsong and brighter afternoons for some weeks now. Visit us to see for yourself!
Understanding the seasons in this way helps us appreciate the year as it unfolds. Meteorological dates give us structure. Astronomical dates give us perspective. Nature gives us the lived experience. And together, they make the changing seasons in the UK all the more fascinating.