OR pollen report
Portland Pollen Report
PollyMap is actively seeking a qualified local collection partner in Portland. This guide uses regional climate and historical allergen data while we recruit a local host.
Collection coming soon to Portland
PollyMap is actively recruiting a verified local partner in Portland. Be the first to know — or apply to be the partner.
Pollen patterns in Portland
In Portland, 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
Portland 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 Portland
Explore pollen activity in nearby cities reported by the PollyMap network.
Frequently asked questions
When is allergy season in Portland?
In Portland, 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 Portland?
The most prevalent local pollens in Portland include Alder, Birch, Cedar in the spring season.
What months are worst for allergies in Portland?
Most Portland allergy sufferers report the worst symptoms during peak tree pollen in March-May and again during ragweed season in September.
Does Portland have mold allergies?
Yes. Portland's climate supports Cladosporium and Alternaria spore exposure, with counts typically peaking in the warm and humid months.
Why are allergies bad in Portland?
Local geography, climate, and seasonal plant cycles all influence allergen load in Portland. The combination of regional vegetation and weather creates predictable spring and fall pollen peaks.
Is there a local pollen collection site in Portland?
Not yet. PollyMap is actively seeking a qualified local allergy clinic or environmental health partner in Portland to host weekly pollen collection.
How can my clinic become a PollyMap partner in Portland?
Clinics in Portland 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 Portland.
Become the lead PollyMap collection partner in Portland and join our national network.
Apply today