PA pollen report
Philadelphia Pollen Report
Philadelphia sits in the humid Delaware Valley, surrounded by mature hardwood forest and lined with some of the densest street-tree canopy on the East Coast. Spring brings heavy oak and maple pollen, early summer belongs to grasses, and ragweed owns the fall — with mold riding along through every humid stretch in between. It's a long, reliable allergy season that keeps local clinics busy from March to November.
Collection coming soon to Philadelphia
PollyMap is actively recruiting a verified local partner in Philadelphia. Be the first to know — or apply to be the partner.
While we find a local clinic
Test the air at your own home in Philadelphia
No allergy clinic is reporting from Philadelphia 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.
What drives allergies in Philadelphia
Trees: oak, maple, and sycamore (March – May)
Oaks (Quercus) are Philadelphia's biggest spring trigger, joined by maples, birch, and the city's iconic sycamores. Warm spells in April can send counts soaring almost overnight.
Grasses: Timothy and Bermuda (May – July)
Lawn and meadow grasses peak in June across the metro's parks and suburbs, overlapping with the tail end of tree season.
Weeds: ragweed (August – October)
Ragweed (Ambrosia) flourishes along the region's rail lines, riverbanks, and vacant lots. Counts stay elevated until the first killing frost.
Mold: humid from June through fall
Delaware Valley humidity keeps Alternaria and Cladosporium active all summer, with a second spike as leaves drop in October and November.
Pollen patterns in Philadelphia
In Philadelphia, tree pollen — including Birch, Oak, Maple — typically dominates from late winter through spring. Timothy grass is the most common warm-season pollinator, and Ragweed drives the largest fall pollen load.
Top trees
- Birch
- Oak
- Maple
- Beech
- Ash
Top grasses
- Timothy
- Bluegrass
- Orchard
- Rye
Top weeds
- Ragweed
- Plantain
- Pigweed
- Lamb's quarters
Top molds
- Alternaria
- Cladosporium
- Aspergillus
- Penicillium
Philadelphia pollen calendar
Typical monthly intensity across the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| tree | ||||||||||||
| grass | ||||||||||||
| weed | ||||||||||||
| mold |
Historical reports
Cities near Philadelphia
Explore pollen activity in nearby cities reported by the PollyMap network.
Frequently asked questions
What is the pollen count in Philadelphia today?
PollyMap publishes real, microscope-verified pollen counts for Philadelphia — measured from physical air samples. The latest report on this page shows current tree, grass, weed, and mold levels.
Is the pollen count high in Philadelphia right now?
Philadelphia pollen typically peaks in April and May (trees), June (grasses), and September (ragweed). Check the measured reports on this page for today's levels.
When is allergy season in Philadelphia?
March through November: tree pollen in spring, grass in early summer, ragweed from late summer to frost, and mold through every humid stretch.
Why are allergies so bad in Philadelphia?
The metro combines heavy hardwood tree canopy, abundant urban ragweed habitat, and Delaware Valley humidity that sustains mold — so there's a major allergen active in almost every month from March to November.
Are you an allergy clinic in Philadelphia? Claim your territory on PollyMap.
PollyMap is a local authority-building tool for allergy clinics, ENT practices, and any clinic that offers allergy care. By becoming the Official PollyMap Partner for your part of Philadelphia, your clinic gets credited on real pollen reports, receives ready-to-share weekly content, and becomes the go-to local expert patients trust.
We assign each partner a designated territory within the Philadelphia metro — like a franchise territory. Philadelphia has room for multiple partners, but once your area is assigned, it's locked to your clinic.
No clinic has claimed a territory in Philadelphia yet. The best areas go to the first clinics that sign up — once one does, that part of town is off the table for everyone else.
From Center City to the Main Line, South Jersey, and Wilmington, Greater Philadelphia has room for many PollyMap territories. The first allergy clinic in each area becomes its credited local expert.
- Your clinic credited on every Philadelphia pollen report
- Weekly real-sample reports and ready-to-share content under your brand
- Locked territory — competing clinics can't claim your area
- Become the go-to allergy expert in your part of Philadelphia
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