WA · Allergy Season Guide
Seattle Allergy Season Guide
PollyMap is actively seeking a qualified local collection partner in Seattle. 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 Seattle.
We're recruiting a qualified local allergy clinic — or any clinic that provides allergy care — to become the official pollen collection partner for Seattle.
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Test the air at your own home in Seattle
No allergy clinic is reporting from Seattle 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.
Summary
PollyMap does not yet have weekly collected pollen data for Seattle. 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 Seattle
Seattle shares Washington's a cool, wet maritime climate with mild summers, rainy winters, and high year-round humidity. at 175 ft elevation.
Seattle at 175 ft elevation sits within Washington's broader regional climate.
In Seattle, tree pollen — including Alder, Birch, Cedar — typically dominates from late winter through spring. Rye grass is the most common warm-season pollinator, and Plantain drives the largest fall pollen load.
Seattle's local mold profile includes Cladosporium, Alternaria, Penicillium. 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.
Seattle monthly allergy calendar
Typical month-by-month intensity for the four major airborne allergen categories in Seattle.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Tree | High | V.High | V.High | High | Mod | Low | Low | Low | Low | Low | Mod | Mod |
| Grass | — | Low | Mod | High | V.High | V.High | High | Mod | Low | Low | Low | — |
| Weed | Low | Low | Mod | Mod | Mod | Mod | High | High | High | Mod | Low | Low |
| Mold | High | High | Mod | Mod | Low | Low | Low | Mod | Mod | High | V.High | High |
Most common airborne molds
Frequently asked questions about allergies in Seattle
Related guides
State Guide
Washington Allergy Season Guide
Nearby city
Spokane Allergy Season Guide
Nearby city
Tacoma Allergy Season Guide
Nearby city
Vancouver Allergy Season Guide
Nearby city
Bellevue Allergy Season Guide
Nearby city
Olympia Allergy Season Guide
Library
Pollen species library
Library
Mold species library
Reports
Latest PollyMap reports
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