WA · Allergy Season Guide
Bellevue Allergy Season Guide
PollyMap is actively seeking a qualified local collection partner in Bellevue. 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 Bellevue.
We're recruiting a qualified local allergy clinic — or any clinic that provides allergy care — to become the official pollen collection partner for Bellevue.
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Test the air at your own home in Bellevue
No allergy clinic is reporting from Bellevue 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 Bellevue. 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 Bellevue
Bellevue shares Washington's a cool, wet maritime climate with mild summers, rainy winters, and high year-round humidity. at 256 ft elevation.
Bellevue at 256 ft elevation sits within Washington's broader regional climate.
In Bellevue, 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.
Bellevue'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.
Bellevue monthly allergy calendar
Typical month-by-month intensity for the four major airborne allergen categories in Bellevue.
| 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 Bellevue
Related guides
State Guide
Washington Allergy Season Guide
Nearby city
Seattle Allergy Season Guide
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Spokane Allergy Season Guide
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Tacoma Allergy Season Guide
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Vancouver Allergy Season Guide
Nearby city
Olympia Allergy Season Guide
Library
Pollen species library
Library
Mold species library
Reports
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