PA · Allergy Season Guide
Pennsylvania Allergy Season Guide
Pennsylvania experiences a humid continental climate with four distinct seasons — cold, snowy winters and warm, humid summers.
Summary
Pennsylvania has 0 active PollyMap collection sites, and is seeking partners in 5 additional cities. Tree pollen typically dominates early spring, grass pollen peaks in late spring and early summer, and weed pollen (including ragweed) extends from late summer through fall.
PollyMap collection status across Pennsylvania
While we find a local clinic
Test the air at your own home in Pennsylvania
No allergy clinic is reporting from Pennsylvania yet. Until one does, you can order your own PollyKit — a simple air sampler you hang outdoors or indoors. Send it back and the PollyKit Lab shows you exactly what's floating in your air.
- Pollen from local trees, grasses and weeds
- Airborne mold spores
- Dust mites and other indoor allergens
Hang it outdoors
See which pollen and mold are in your yard this season.
Or hang it indoors
Check bedrooms and living spaces for mold, dust mites and more.
Statewide allergy overview
Pennsylvania experiences a humid continental climate with four distinct seasons — cold, snowy winters and warm, humid summers.
Birch, oak, maple, and beech produce an intense April-May tree season. Grass pollen peaks in June, and ragweed lasts from mid-August through October.
Humid summers, dense tree cover, and heavy leaf decay drive elevated Alternaria and Cladosporium counts from late summer into fall.
Allergy patterns vary by elevation and proximity to coast or mountains within Pennsylvania, but most of the state shares a common seasonal rhythm of spring tree pollen, summer grass pollen, and late-summer to fall weed pollen.
Pennsylvania allergy calendar
Month-by-month intensity for the four major airborne allergen categories.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Tree | Low | Mod | High | V.High | V.High | High | Mod | Low | Low | Low | Low | Low |
| Grass | — | — | Low | Mod | V.High | V.High | High | Mod | Low | Low | — | — |
| Weed | Low | Low | Low | Mod | Mod | Mod | High | V.High | V.High | High | Mod | Low |
| Mold | Low | Low | Mod | Mod | High | High | High | V.High | V.High | V.High | Mod | Low |
Top weed pollens
Top airborne molds
Major city guides in Pennsylvania
PA
Philadelphia
View Philadelphia allergy season guide →
PA
Pittsburgh
View Pittsburgh allergy season guide →
PA
Allentown
View Allentown allergy season guide →
PA
Reading
View Reading allergy season guide →
PA
Erie
View Erie allergy season guide →
Latest PollyMap reports for Pennsylvania
Frequently asked questions
Get local pollen alerts for Pennsylvania.
Subscribe to PollyMap email alerts and be notified when new local reports are published in your area.
Subscribe to alerts