CA pollen report
San Francisco Pollen Report
San Francisco's mild, fog-cooled climate stretches its allergy seasons long. Grasses pollinate from spring well into fall across the Bay Area's hills, eucalyptus and cypress add heavy tree pollen, and the city's famous wind keeps everything moving. Microclimates mean pollen levels can differ sharply between the Sunset, downtown, and the East Bay hills.
Collection coming soon to San Francisco
PollyMap is actively recruiting a verified local partner in San Francisco. Be the first to know — or apply to be the partner.
While we find a local clinic
Test the air at your own home in San Francisco
No allergy clinic is reporting from San Francisco 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.
What drives allergies in San Francisco
Grasses: the Bay Area's main event (March – October)
Wild oats, ryegrass, and other annual grasses cover Bay Area hills and pollinate for months — grass is the region's single biggest allergen season.
Trees: eucalyptus, cypress, and oak (January – June)
Monterey cypress and eucalyptus release heavy pollen, with coast live oak (Quercus agrifolia) and acacia contributing through spring.
Weeds: modest fall season (August – October)
Ragweed (Ambrosia) is present but lighter than the Midwest; sagebrush and coyote brush contribute in the hills.
Mold: fog and damp winters
Coastal fog and winter rains keep Alternaria and Cladosporium in play through the wet months — unusual for a West Coast city.
Pollen patterns in San Francisco
In San Francisco, 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
San Francisco 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 San Francisco
Explore pollen activity in nearby cities reported by the PollyMap network.
Frequently asked questions
What is the pollen count in San Francisco today?
PollyMap publishes real, microscope-verified pollen counts for San Francisco — measured from physical air samples. The latest report on this page shows current tree, grass, weed, and mold levels.
Is the pollen count high in San Francisco right now?
Grass pollen is the Bay Area's longest season, running spring through fall; trees peak in late winter and spring. The measured reports on this page show today's actual levels.
When is allergy season in San Francisco?
Trees January–June, grasses March–October, weeds in fall, and mold through the foggy and rainy months — one of the longest overall seasons in the country.
Why do allergies vary so much within the Bay Area?
Microclimates. Fog and ocean wind can hold pollen down in the city while the sunny East Bay hills spike — real local measurements matter more here than regional forecasts.
Are you an allergy clinic in San Francisco? Claim your territory on PollyMap.
PollyMap is a local authority-building tool for allergy clinics, ENT practices, and any clinic that offers allergy care. By becoming the Official PollyMap Partner for your part of San Francisco, your clinic gets credited on real pollen reports, receives ready-to-share weekly content, and becomes the go-to local expert patients trust.
We assign each partner a designated territory within the San Francisco metro — like a franchise territory. San Francisco has room for multiple partners, but once your area is assigned, it's locked to your clinic.
No clinic has claimed a territory in San Francisco yet. The best areas go to the first clinics that sign up — once one does, that part of town is off the table for everyone else.
The Bay Area is many micro-markets — San Francisco, Oakland, Berkeley, San Mateo, and Marin each make PollyMap territories. First clinic in each area becomes its credited pollen expert.
- Your clinic credited on every San Francisco pollen report
- Weekly real-sample reports and ready-to-share content under your brand
- Locked territory — competing clinics can't claim your area
- Become the go-to allergy expert in your part of San Francisco
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