MD · Allergy Season Guide
Maryland Allergy Season Guide
Maryland experiences a humid subtropical to humid continental climate with warm, humid summers and mild to cold winters.
Summary
Maryland 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 Maryland
While we find a local clinic
Test the air at your own home in Maryland
No allergy clinic is reporting from Maryland 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
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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
Maryland experiences a humid subtropical to humid continental climate with warm, humid summers and mild to cold winters.
Oak, birch, cedar, maple, and pine drive a long March-through-May tree season. Grass pollen is heaviest in May and June, and ragweed extends through October.
High summer humidity and dense forest cover produce sustained high mold counts from June through frost.
Allergy patterns vary by elevation and proximity to coast or mountains within Maryland, but most of the state shares a common seasonal rhythm of spring tree pollen, summer grass pollen, and late-summer to fall weed pollen.
Maryland 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 | V.High | V.High | High | Mod | Low | Low | Low | Low | Low | Low |
| Grass | — | Low | Mod | High | V.High | High | Mod | Low | Low | Low | — | — |
| Weed | Low | Low | Low | Mod | Mod | Mod | High | V.High | V.High | High | Mod | Low |
| Mold | Low | Mod | Mod | Mod | High | High | V.High | V.High | V.High | High | Mod | Low |
Top airborne molds
Major city guides in Maryland
MD
Baltimore
View Baltimore allergy season guide →
MD
Frederick
View Frederick allergy season guide →
MD
Gaithersburg
View Gaithersburg allergy season guide →
MD
Rockville
View Rockville allergy season guide →
MD
Bowie
View Bowie allergy season guide →
Latest PollyMap reports for Maryland
Frequently asked questions
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