Maryland pollen and allergy seasons
Maryland 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 September
Cities in Maryland
No tracked cities yet for Maryland.
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 Maryland for ozone, dust, and smoke readings by city.
The Maryland allergy season
Allergy levels in Maryland 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 Maryland?
Pollen levels in Maryland usually begin climbing in February and reach their highest point in April.
What is the worst month for allergies in Maryland?
April is typically the worst month in Maryland, driven by oak pollen.
When does ragweed season end in Maryland?
Ragweed pollen in Maryland usually fades by the end of October, after the first hard frost in colder areas.
When is the best time for allergies in Maryland?
January usually brings the lowest pollen levels of the year in Maryland.