Pollen season generally spans much of the year but varies by pollen type and region:

• Start: Pollen season can begin as early as January with tree pollen starting to release

• Spring: Tree pollen peaks from February to May, with the highest pollen counts typically in late March to late April

• Summer: Grass pollen season usually runs from April through July or August, peaking in June or early summer

• Autumn: Weed pollen season begins around July and can continue until September or even into October and November, especially ragweed pollen which ends after the first hard frost

• Winter: Most pollen levels are low, but some tree pollen (e.g., alder, hazel, yew) can still cause symptoms in winter months

Overall, the peak pollen season typically lasts from early spring (February or March) through early fall (September), about 6 to 8 months, but low levels of pollen can be present year-round depending on the local climate and plant types

. Climate change and regional differences can extend or shorten these periods. In summary, pollen season can last from early January to as late as November in some areas, with the highest allergy impacts usually from February through September