TX pollen report
San Antonio Pollen Report
San Antonio sits on the edge of the Texas Hill Country, home of the infamous mountain cedar — Ashe juniper (Juniperus ashei) — whose winter pollen clouds cause 'cedar fever,' one of the most intense allergic reactions in the country. Add long oak, grass, and ragweed seasons to the mix, and San Antonio is genuinely a year-round allergy city.
Collection coming soon to San Antonio
PollyMap is actively recruiting a verified local partner in San Antonio. 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 Antonio
No allergy clinic is reporting from San Antonio 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 Antonio
Mountain cedar (December – February)
Ashe juniper (Juniperus ashei) pollinates in the dead of winter, often explosively after cold fronts sweep pollen down from the Hill Country. Cedar fever hits San Antonio hardest from mid-December through February — when the rest of the country barely has pollen at all.
Trees: oak, elm, and pecan (February – May)
Live oak (Quercus virginiana) and other oaks blanket the city in spring, along with elm, pecan, and mulberry. Oak season in San Antonio is long and heavy, often overlapping the end of cedar season.
Grasses: Bermuda and Johnson grass (April – September)
Bermuda, Johnson grass, and other lawn and pasture grasses dominate the hot months, with the longest grass pollen season of any northern-tier city.
Weeds and mold: ragweed fall, mold year-round
Ragweed (Ambrosia) runs September through November, and warm, humid stretches keep mold spores (Alternaria, Cladosporium) active in every season.
Pollen patterns in San Antonio
In San Antonio, tree pollen — including Mountain cedar, Oak, Pecan — 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
- Mountain cedar
- Oak
- Pecan
- Ash
- Elm
Top grasses
- Bermuda
- Johnson
- Rye
Top weeds
- Ragweed
- Pigweed
- Russian thistle
Top molds
- Cladosporium
- Alternaria
- Aspergillus
San Antonio 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 Antonio
Explore pollen activity in nearby cities reported by the PollyMap network.
Frequently asked questions
What is the pollen count in San Antonio today?
PollyMap publishes real, measured pollen counts for San Antonio — collected with physical samplers and identified under a microscope. See the latest San Antonio report on this page for current cedar, oak, grass, weed, and mold levels.
When is cedar fever season in San Antonio?
Mountain cedar (Ashe juniper) pollinates from mid-December through February, with the worst days following strong cold fronts that carry pollen out of the Hill Country. Cedar season is San Antonio's signature allergy event.
When is allergy season in San Antonio?
Practically all year. Mountain cedar runs December through February, oak and other trees February through May, grasses through the long summer, and ragweed from September to November.
Is the pollen count high in San Antonio right now?
It depends on the season: winter means cedar, spring means oak, summer means grass, and fall means ragweed. The measured reports on this page show the latest real levels across every category.
Are you an allergy clinic in San Antonio? 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 Antonio, 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 Antonio metro — like a franchise territory. San Antonio 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 Antonio 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.
San Antonio's sprawl supports multiple PollyMap territories — from Stone Oak and Alamo Heights to the Medical Center and the south side. The first allergy clinic in each territory owns the local pollen authority there.
- Your clinic credited on every San Antonio 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 Antonio
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