Allergy season generally ends by late autumn when plants stop producing pollen and enter dormancy. Specifically, tree pollen season usually ends by late spring or early summer (around May to June), grass pollen season typically wraps up by mid-summer (July or August), and weed pollen, particularly ragweed, often marks the last of the pollen season, ending after the first hard frost, which is usually from late October to early November in many regions. However, this can vary greatly depending on the location, climate, and individual sensitivities to different allergens. In some places, allergy season might last from early spring to late autumn, while others may experience allergies mainly in certain sub-seasons within that range.
