MD pollen report
Baltimore Pollen Report
Baltimore sits between the Piedmont and the Chesapeake Bay, and its allergy calendar reflects both: oak and maple pour pollen over the metro each spring, grasses run through humid summers, and ragweed is heavy from August to frost. Bay humidity keeps mold spores active through every warm, damp stretch — which in Baltimore is most of the year.
Collection coming soon to Baltimore
PollyMap is actively recruiting a verified local partner in Baltimore. 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 Baltimore
No allergy clinic is reporting from Baltimore 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 Baltimore
Trees: oak, maple, and birch (March – May)
Oaks (Quercus) dominate the Piedmont and the city's mature canopy, with maple, birch, and sycamore contributing. April is typically the peak.
Grasses: June – July
Lawn and meadow grasses pollinate heavily in early summer across the metro's parks and suburbs.
Weeds: ragweed (August – frost)
Ragweed (Ambrosia) thrives along the region's roadsides, rail lines, and waterfront lots. Counts stay elevated until a hard frost.
Mold: Chesapeake humidity
Bay-driven humidity keeps Alternaria and Cladosporium active from late spring through fall, with spikes after storms and during damp autumns.
Pollen patterns in Baltimore
In Baltimore, tree pollen — including Oak, Birch, Cedar — typically dominates from late winter through spring. Bluegrass grass is the most common warm-season pollinator, and Ragweed drives the largest fall pollen load.
Top trees
- Oak
- Birch
- Cedar
- Maple
- Pine
Top grasses
- Bluegrass
- Bermuda
- Rye
- Fescue
Top weeds
- Ragweed
- Pigweed
- Plantain
Top molds
- Alternaria
- Cladosporium
- Aspergillus
Baltimore 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 Baltimore
Explore pollen activity in nearby cities reported by the PollyMap network.
Frequently asked questions
What is the pollen count in Baltimore today?
PollyMap publishes real, microscope-verified pollen counts for Baltimore — 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 Baltimore right now?
Baltimore's worst stretches are April (oak), June (grasses), and September (ragweed). The measured reports on this page show today's actual levels.
When is allergy season in Baltimore?
March through November: trees in spring, grasses in early summer, ragweed from August until frost, and mold through the humid months.
Does living near the Chesapeake make allergies worse?
The Bay's humidity sustains outdoor mold for much of the year, and the region's mix of mature tree canopy and disturbed urban soil means heavy spring trees and heavy fall ragweed.
Are you an allergy clinic in Baltimore? 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 Baltimore, 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 Baltimore metro — like a franchise territory. Baltimore has room for multiple partners, but once your area is assigned, it's locked to your clinic.
No clinic has claimed a territory in Baltimore 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.
Baltimore's suburbs are distinct territories — Towson, Catonsville, Columbia, and Bel Air each qualify. The first allergy clinic in each area becomes its credited pollen expert.
- Your clinic credited on every Baltimore 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 Baltimore
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