UK Pollen Calendar

Generally speaking there are three main groups of culprits that release their pollen during different parts of the spring and summer. These are the trees, grasses and weeds all of which release allergy causing pollen grains. The timing and severity of the pollen season does vary from year to year depending on weather conditions. Timings will also vary slightly according to region.

UK Tree Pollen Calendar

Species	Start of season	Peak pollen	End of season
Alder	Early January	Mid February to early April	Mid April
Hazel	Mid January	Mid February to mid March	Mid April
Yew	Mid January	Late February to late March	End of April
Elm	Late February	Early March to early April	End of April
Willow	Late February	Early March to mid May	End of April
Poplar	Mid March	End of Mar to early April	End of April
Birch	Early March	End of March to mid May	Early June
Ash	Early March	Early April to end of April	Mid May
Plane	Mid March	Late April to mid May	Late May
Oak	Early April	Mid April to early June	Mid June
Pine	Mid April	Start of May to mid June	Mid July
Lime	Start of June	Late June to early July	End of July

Grass & Crop Pollen Calendar

Species	Start of season	Peak pollen	End of season
Grass	Start of May	Start of June to end of July	Early Septemper
Oil seed rape	Late March	Early May to end of June	Mid July

UK Weed Pollen Calendar

Species	Start of season	Peak pollen	End of season
Plantain	Start of May	Early May to end of June	Mid July
Nettle	Start of May	Early June to early July	Late August
Dock	Late May	Mid June to late July	Early August
Mugwort	Late June	Mid June to mid August	Early September