Arizona pollen and allergy seasons
Arizona spreads its allergy season across most of the year, with desert trees in late winter and spring and weeds returning after the summer monsoon.
Twelve month pollen calendar
What is active in August
Cities in Arizona
No tracked cities yet for Arizona.
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 Arizona for ozone, dust, and smoke readings by city.
The Arizona allergy season
Allergy levels in Arizona peak in April, when olive pollen runs highest. The season moves through tree pollen around April, grass in April, weed pollen such as ragweed in September. Levels start to climb around January. The lowest pollen levels of the year arrive in June.
Common questions
When does allergy season start in Arizona?
Pollen levels in Arizona usually begin climbing in January and reach their highest point in April.
What is the worst month for allergies in Arizona?
April is typically the worst month in Arizona, driven by olive pollen.
When does ragweed season end in Arizona?
Ragweed pollen in Arizona usually fades by the end of October, after the first hard frost in colder areas.
When is the best time for allergies in Arizona?
June usually brings the lowest pollen levels of the year in Arizona.