CA pollen report
Fresno Pollen Report
PollyMap is actively seeking a qualified local collection partner in Fresno. This guide uses regional climate and historical allergen data while we recruit a local host.
Collection coming soon to Fresno
PollyMap is actively recruiting a verified local partner in Fresno. Be the first to know — or apply to be the partner.
Pollen patterns in Fresno
In Fresno, tree pollen — including Oak, Olive, Cypress — typically dominates from late winter through spring. Bermuda grass is the most common warm-season pollinator, and Ragweed drives the largest fall pollen load.
Top trees
- Oak
- Olive
- Cypress
- Acacia
- Sycamore
Top grasses
- Bermuda
- Rye
- Fescue
Top weeds
- Ragweed
- Sagebrush
- Pigweed
Top molds
- Cladosporium
- Alternaria
- Penicillium
Fresno 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 Fresno
Explore pollen activity in nearby cities reported by the PollyMap network.
Frequently asked questions
When is allergy season in Fresno?
In Fresno, 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 Fresno?
The most prevalent local pollens in Fresno include Oak, Olive, Cypress in the spring season.
What months are worst for allergies in Fresno?
Most Fresno allergy sufferers report the worst symptoms during peak tree pollen in March-May and again during ragweed season in September.
Does Fresno have mold allergies?
Yes. Fresno's climate supports Cladosporium and Alternaria spore exposure, with counts typically peaking in the warm and humid months.
Why are allergies bad in Fresno?
Local geography, climate, and seasonal plant cycles all influence allergen load in Fresno. The combination of regional vegetation and weather creates predictable spring and fall pollen peaks.
Is there a local pollen collection site in Fresno?
Not yet. PollyMap is actively seeking a qualified local allergy clinic or environmental health partner in Fresno to host weekly pollen collection.
How can my clinic become a PollyMap partner in Fresno?
Clinics in Fresno 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.
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