In Virginia, pollen season generally starts in late February and ends in November. The pattern of pollen falling depends on the type of pollen:

• Tree pollen starts releasing from late February and usually ends by June.
• Grass pollen peaks mainly in early summer, from May to early July, then declines.
• Weed pollen season begins in late August and continues until the first frost, which typically arrives in November and marks the end of pollen season.

Therefore, pollen typically stops falling in Virginia by November when the first frost occurs, although the exact end can vary slightly based on weather conditions from year to year. The first frost is key because it kills or slows down plants producing pollen, significantly reducing airborne pollen levels.