Philadelphia, PA Grass Pollen
Grass pollen in Philadelphia usually peaks around June, reaching High at its worst. Philadelphia's allergy year opens with an early tree season and ends with a long ragweed fall: maple and birch in spring, grass through early summer, and ragweed from late summer into October.
Grass pollen runs high in late spring and early summer across the Delaware Valley.
Grass in Philadelphia today
Monday, July 27, 2026
Grass pollen by month in Philadelphia
How grass usually runs across the year. The current month is outlined.
Managing grass season in Philadelphia
If grass is your trigger, start a daily antihistamine like cetirizine (Zyrtec) or loratadine (Claritin) a week or two before the June peak, rather than waiting for symptoms. Keep windows closed on high-count mornings, shower and change clothes after time outside, and run the AC on recirculate in the car.
When symptoms don't ease with over-the-counter medicine, an allergist in Pennsylvania can test whether grass is really what you react to and talk through longer-term options like allergy shots.
Sources
More pollen in Philadelphia
- Philadelphia ragweed pollen — peaks September.
- Philadelphia birch pollen — peaks April.
- Philadelphia oak pollen — peaks April.
- Philadelphia maple pollen — peaks March to April.
- Philadelphia pollen calendar — every allergen, month by month.
- Philadelphia pollen count today — live tree, grass, and weed levels with a 5-day forecast.
- Pennsylvania pollen season — the statewide calendar and other cities.
Get Philadelphia pollen alerts
We send a free email whenever pollen is High or Very High in Philadelphia. No spam, no daily emails when pollen is low. Just a heads-up on the days that matter.
Sign up for free alertsSeasonal pattern based on Pennsylvania pollen data and local sources. Today's reading updated daily. MyPollenPal