Washington pollen and allergy seasons
Washington has an early tree season west of the mountains and an intense grass season in late spring and early summer.
Twelve month pollen calendar
What is active in August
Cities in Washington
No tracked cities yet for Washington.
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 Washington for ozone, dust, and smoke readings by city.
The Washington allergy season
Allergy levels in Washington peak in June, when grass pollen runs highest. The season moves through tree pollen around February, grass in June, weed pollen such as ragweed in August. Levels start to climb around February. The lowest pollen levels of the year arrive in January.
Common questions
When does allergy season start in Washington?
Pollen levels in Washington usually begin climbing in February and reach their highest point in June.
What is the worst month for allergies in Washington?
June is typically the worst month in Washington, driven by grass pollen.
When does ragweed season end in Washington?
Ragweed pollen in Washington usually fades by the end of September, after the first hard frost in colder areas.
When is the best time for allergies in Washington?
January usually brings the lowest pollen levels of the year in Washington.