MD · Allergy Season Guide
Baltimore Allergy Season Guide
PollyMap is actively seeking a qualified local collection partner in Baltimore. This guide uses regional climate and historical allergen data while we recruit a local host.
PollyMap is actively looking for a qualified local partner in Baltimore.
We're recruiting a qualified local allergy clinic, naturopathic clinic, university, environmental health professional, or other qualified organization to become the official pollen collection partner for Baltimore.
Become the Official PollyMap Partner for BaltimoreSummary
PollyMap does not yet have weekly collected pollen data for Baltimore. This guide is based on regional climate patterns and historical allergen data while we recruit a local collection partner. Tree pollen peaks in spring, grass pollen in late spring and early summer, and weed pollen in late summer and fall.
Local allergy guide for Baltimore
Baltimore shares Maryland's a humid subtropical to humid continental climate with warm, humid summers and mild to cold winters. at 33 ft elevation.
Baltimore at 33 ft elevation sits within Maryland's broader regional climate.
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.
Baltimore's local mold profile includes Alternaria, Cladosporium, Aspergillus. Spore counts tend to peak after rainfall and during the warm, humid portion of the year.
Local weather — temperature, rainfall, wind, and humidity — drives day-to-day pollen levels. Dry, windy days following warm weather typically produce the highest counts, while heavy rain temporarily clears the air.
Baltimore monthly allergy calendar
Typical month-by-month intensity for the four major airborne allergen categories in Baltimore.
| 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 |
Most common airborne molds
Current PollyMap data for Baltimore
Official PollyMap Partner in Baltimore
Frequently asked questions about allergies in Baltimore
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Related guides
State Guide
Maryland Allergy Season Guide
Nearby city
Frederick Allergy Season Guide
Nearby city
Gaithersburg Allergy Season Guide
Nearby city
Rockville Allergy Season Guide
Nearby city
Bowie Allergy Season Guide
Library
Pollen species library
Library
Mold species library
Reports
Latest PollyMap reports
Partners
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