District of Columbia pollen and allergy seasons
Washington has a strong spring tree season led by oak and a heavy ragweed season in the fall.
Twelve month pollen calendar
What is active in August
Cities in District of Columbia
No tracked cities yet for District of Columbia.
Today and worst today come from live readings where available. Typical shows the usual level for this month from the seasonal profile.
Pollen is only half of what's in the air. See today's air quality in District of Columbia for ozone, dust, and smoke readings by city.
The District of Columbia allergy season
Allergy levels in District of Columbia peak in April, when oak pollen runs highest. The season moves through tree pollen around April, grass in May, weed pollen such as ragweed in September. Levels start to climb around February. The lowest pollen levels of the year arrive in January.
Common questions
When does allergy season start in District of Columbia?
Pollen levels in District of Columbia usually begin climbing in February and reach their highest point in April.
What is the worst month for allergies in District of Columbia?
April is typically the worst month in District of Columbia, driven by oak pollen.
When does ragweed season end in District of Columbia?
Ragweed pollen in District of Columbia usually fades by the end of October, after the first hard frost in colder areas.
When is the best time for allergies in District of Columbia?
January usually brings the lowest pollen levels of the year in District of Columbia.