CA
California Pollen Reports
California experiences a Mediterranean climate with mild, wet winters and warm, dry summers along the coast, with hotter inland valleys.
No active PollyMap Partner in California yet
We're seeking a pollen partner in California.
PollyMap doesn't publish cheap forecast estimates — the kind that guess what might be in the air and are often wrong by the time you read them. Every report on PollyMap is real airborne pollen and mold, captured by a PollyKit air sampler and counted under a microscope by a trained local partner.
We're actively seeking an allergy clinic or qualified collector to become the Official PollyMap Partner for California. Exclusive territory, weekly content, and AI-assisted analysis included.
Pollen patterns across California
Oak, olive, cypress, and acacia tree pollen are the largest spring triggers. Bermuda and rye grass extend the season into summer, and ragweed plus sagebrush are the late-summer weeds.
California pollen calendar
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
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Featured cities in California
Don't see your city? PollyMap partners can serve any city in California — request a local report below.
Don't see your city?
We cover every city in California through our partner network. Request a report for your town and we'll route it to the nearest certified allergist.
Latest reports
Frequently asked questions
When is allergy season in California?
Allergy season in California typically runs from late winter through fall. Tree pollen rises first, followed by grass pollen in late spring and early summer, and weed pollen (especially ragweed) in late summer and fall.
What pollen is highest in California?
In California, the highest-pollen species are typically Oak, Olive, Cypress in spring, Bermuda grass in early summer, and Ragweed in fall.
What months are worst for allergies in California?
For most people, April and May (tree pollen) and September (ragweed) are the most difficult months in California, with grass pollen creating a third peak in June.
Does California have mold allergies?
Yes. The region's climate supports both outdoor and indoor mold exposure — particularly Cladosporium, Alternaria. Outdoor mold spore counts often rise after rain and in fall when leaves decay.
How can clinics become PollyMap collection partners?
Qualified allergy clinics, naturopathic offices, universities, and environmental health professionals can apply to host a PollyKit and become an official PollyMap collection partner. Applications are reviewed by the PollyMap team.
Become the lead collection partner for California.
PollyMap is actively seeking allergy clinics and qualified collectors in California.
Apply today