New Jersey pollen and allergy seasons
New Jersey has a spring tree season and a heavy ragweed season in late summer and early fall.
Twelve month pollen calendar
What is active in September
Cities in New Jersey
No tracked cities yet for New Jersey.
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 New Jersey for ozone, dust, and smoke readings by city.
The New Jersey allergy season
Allergy levels in New Jersey peak in September, when ragweed 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 March. The lowest pollen levels of the year arrive in January.
Common questions
When does allergy season start in New Jersey?
Pollen levels in New Jersey usually begin climbing in March and reach their highest point in September.
What is the worst month for allergies in New Jersey?
September is typically the worst month in New Jersey, driven by ragweed pollen.
When does ragweed season end in New Jersey?
Ragweed pollen in New Jersey usually fades by the end of October, after the first hard frost in colder areas.
When is the best time for allergies in New Jersey?
January usually brings the lowest pollen levels of the year in New Jersey.