CA pollen report
Los Angeles Pollen Report
Los Angeles has no traditional pollen off-season. The Mediterranean climate means something is always blooming — ornamental olives and oaks in spring, grasses nearly year-round, and weeds through fall — and Santa Ana winds can carry pollen (and dust) across the basin for days at a time.
Collection coming soon to Los Angeles
PollyMap is actively recruiting a verified local partner in Los Angeles. 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 Los Angeles
No allergy clinic is reporting from Los Angeles 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 Los Angeles
Trees: olive, oak, and sycamore (February – May)
LA's planted urban forest drives spring pollen: olive trees (Olea europaea) — a major, often overlooked allergen — plus coast live oak (Quercus agrifolia), sycamore, eucalyptus, and ash. Season starts early and peaks in spring.
Grasses: Bermuda and ryegrass, nearly year-round
Bermuda grass pollinates most of the year in LA's climate, and ornamental ryegrass adds to the spring and summer load. Grass is the most persistent allergen in the basin.
Weeds: sagebrush and ragweed (summer – fall)
Native sagebrush and invasive weeds pollinate through late summer and fall, especially in the hills and canyons surrounding the metro.
Mold and dust: a different kind of problem
LA's dry climate limits outdoor mold compared to humid cities, but Santa Ana wind events can spike particulate levels dramatically, aggravating allergy and asthma symptoms.
Pollen patterns in Los Angeles
In Los Angeles, 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
Los Angeles 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 Los Angeles
Explore pollen activity in nearby cities reported by the PollyMap network.
Frequently asked questions
What is the pollen count in Los Angeles today?
PollyMap publishes real, measured pollen counts for Los Angeles — collected with physical samplers and identified under a microscope. The latest LA report on this page shows current tree, grass, weed, and mold levels.
Is the pollen count high in Los Angeles right now?
LA pollen is highest in spring (olive, oak, sycamore) and during grass season, which stretches most of the year. Santa Ana winds can spike counts any time from fall through spring. Check the measured reports on this page for the latest levels.
When is allergy season in Los Angeles?
Effectively year-round. Tree pollen peaks February–May, grasses pollinate most months, and weeds carry late summer into fall. There is no true off-season.
Why do my allergies act up during Santa Ana winds?
Santa Ana winds sweep pollen, mold spores, and fine dust from inland valleys and deserts across the LA basin, often for days. Many residents notice their worst symptoms during these wind events.
Are you an allergy clinic in Los Angeles? 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 Los Angeles, 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 Los Angeles metro — like a franchise territory. Los Angeles has room for multiple partners, but once your area is assigned, it's locked to your clinic.
No clinic has claimed a territory in Los Angeles 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.
Greater Los Angeles is one of the largest metros in the world — there is room for many PollyMap territories, from the Valley and the Westside to Pasadena, Long Beach, and Orange County's edge. The first allergy clinic in each territory owns the local pollen authority.
- Your clinic credited on every Los Angeles 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 Los Angeles
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