Hay fever season UK
UK hay fever season runs from February to September, with grass pollen the main trigger from May to July.
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Upcoming dates
| Event | Date | Countdown | Region / notes |
|---|---|---|---|
| 2027 tree pollen season begins | Monday, 1 February 2027 | In 8 months | Hazel and alder first |
| 2027 grass pollen season begins | Saturday, 1 May 2027 | In 11 months | Main trigger season |
| 2027 weed pollen season begins | Tuesday, 1 June 2027 | In 1 year | Nettle, mugwort and plantain |
| 2027 peak grass pollen | Tuesday, 15 June 2027 | In 1 year | Typically June-July |
UK hay fever season spans from February to September, though the pollen type changes through the year. Tree pollen begins first, grass pollen is the main trigger from May to July, and weed pollen can continue into September. June and July are usually the hardest months for grass pollen. The Met Office publishes daily pollen forecasts, and NHS advice is to start treatment before your usual trigger season begins.
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Get a reminder 7 days before Hay fever season UK
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Verified 14 May 2026
Questions
When does hay fever season start in the UK?
Tree pollen can begin in February. Grass pollen, the main trigger for many people, usually starts in May.
When is hay fever at its worst?
June and July are usually worst because grass pollen levels are high.
When does hay fever season end?
Most pollen symptoms ease by late September as weed pollen falls.
Where can I check today's pollen count?
Use the Met Office daily pollen forecast.