WA pollen report
Seattle Pollen Report
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.
Collection coming soon to Seattle
PollyMap is actively recruiting a verified local partner in Seattle. Be the first to know — or apply to be the partner.
Pollen patterns in Seattle
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.
Top trees
- Alder
- Birch
- Cedar
- Hazel
- Maple
Top grasses
- Rye
- Orchard
- Timothy
- Bentgrass
Top weeds
- Plantain
- Dock
- Nettle
Top molds
- Cladosporium
- Alternaria
- Penicillium
- Aspergillus
Seattle 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 Seattle
Explore pollen activity in nearby cities reported by the PollyMap network.
Frequently asked questions
When is allergy season in Seattle?
In Seattle, allergy season starts with tree pollen in late winter and early spring, transitions to grass pollen in May and June, and ends with weed pollen — primarily ragweed and sagebrush — from August through October.
What pollen is highest in Seattle?
The most prevalent local pollens in Seattle include Alder, Birch, Cedar in the spring season.
What months are worst for allergies in Seattle?
Most Seattle allergy sufferers report the worst symptoms during peak tree pollen in March-May and again during ragweed season in September.
Does Seattle have mold allergies?
Yes. Seattle's climate supports Cladosporium and Alternaria spore exposure, with counts typically peaking in the warm and humid months.
Why are allergies bad in Seattle?
Local geography, climate, and seasonal plant cycles all influence allergen load in Seattle. The combination of regional vegetation and weather creates predictable spring and fall pollen peaks.
Is there a local pollen collection site in Seattle?
Not yet. PollyMap is actively seeking a qualified local allergy clinic or environmental health partner in Seattle to host weekly pollen collection.
How can my clinic become a PollyMap partner in Seattle?
Clinics in Seattle can apply to become the official PollyMap collection partner. Approved partners receive PollyKits weekly, conduct 24-48 hour collections, and mail samples back for microscope analysis.
Bring real pollen data to Seattle.
Become the lead PollyMap collection partner in Seattle and join our national network.
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