Tree pollen season UK
Tree pollen season usually runs from February to May, with birch pollen highest in spring.
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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 often start first |
| 2027 birch pollen period begins | Thursday, 1 April 2027 | In 10 months | Birch is often the main spring tree pollen trigger |
| 2027 tree pollen season ends | Monday, 31 May 2027 | In 1 year | UK |
Tree pollen is the first major pollen season of the UK year. Hazel and alder can start from February, while birch pollen is usually most noticeable in April and May. Exact timing varies with weather and location, so daily forecasts matter more than a single fixed date. If tree pollen is your trigger, plan treatment before the first mild spell of late winter or early spring.
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Verified 14 May 2026
Questions
When does tree pollen season start?
It can start in February, especially with hazel and alder pollen.
When is birch pollen highest?
Birch pollen is usually highest during April and May.
Does tree pollen affect everyone with hay fever?
No. It affects a smaller share of sufferers than grass pollen, but symptoms can be severe for those sensitive to it.