The pollen season varies depending on the type of pollen and your location:
- Tree pollen season generally ends by late spring or early summer, around May to June. In milder climates, it can extend into June or even July.
- Grass pollen season usually ends by mid-summer, around July or August, but in some areas can last into early fall.
- Weed pollen season, especially ragweed, tends to end after the first hard frost, which can be late October to early November in many areas, though it can persist longer in warmer regions.
Overall, pollen can be present through most of the year depending on the type, but traditional hay fever season typically winds down by September when grass and nettle pollen seasons end. After that, pollen levels drop significantly though some weed pollen may linger into October and November, before pollen levels become very low in winter and December.
