TX pollen report
Houston Pollen Report
Houston's subtropical climate makes it one of the toughest allergy cities in America. Mild winters barely interrupt the pollen calendar — oak and pine start in late winter, grasses run nearly the entire warm season, ragweed finishes the fall — and the Gulf Coast humidity keeps mold spores elevated almost every month of the year.
Collection coming soon to Houston
PollyMap is actively recruiting a verified local partner in Houston. 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 Houston
No allergy clinic is reporting from Houston 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 Houston
Trees: oak and pine (January – April)
Houston's tree season starts early — sometimes in January. Oaks (Quercus) are the biggest trigger, with pine (Pinus), cedar elm, and hackberry adding to the mix. Yellow pine dust is visible on cars by early spring.
Grasses: Bermuda, nearly year-round (March – October)
Bermuda and other lawn grasses pollinate for most of the year in Houston's climate. Grass counts climb through spring and stay high into the hot, humid summer.
Weeds: ragweed (September – November)
Ragweed (Ambrosia) thrives in Houston's disturbed soils and open fields. Fall weed season overlaps with heavy mold activity after late-summer storms.
Mold: the year-round constant
Humidity is Houston's allergy signature. Outdoor mold spores (Alternaria, Cladosporium) stay active virtually all year, with spikes after heavy rain and tropical weather.
Pollen patterns in Houston
In Houston, 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
Houston 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 Houston
Explore pollen activity in nearby cities reported by the PollyMap network.
Frequently asked questions
What is the pollen count in Houston today?
PollyMap publishes real, microscope-verified pollen counts for Houston — measured from physical air samples rather than computer estimates. The latest Houston report on this page shows current tree, grass, weed, and mold levels.
Is the pollen count high in Houston right now?
Houston's pollen is highest in late winter and spring (oak, pine), through the long grass season, and again in fall with ragweed. Mold stays elevated most of the year. Check the measured reports on this page for the latest levels.
When is allergy season in Houston?
Almost always. Tree pollen runs January through April, grasses March through October, ragweed September through November, and mold is a year-round factor thanks to Gulf humidity.
Why are allergies so bad in Houston?
A long, warm growing season means something is almost always pollinating, and the humidity supercharges mold. Houston is one of the few major metros where allergy season never fully ends.
Are you an allergy clinic in Houston? 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 Houston, 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 Houston metro — like a franchise territory. Houston has room for multiple partners, but once your area is assigned, it's locked to your clinic.
No clinic has claimed a territory in Houston 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 Houston is one of the largest metros in the country — there is room for many PollyMap territories, from Katy and Sugar Land to The Woodlands and Clear Lake. Lock in your area and become the go-to allergy clinic patients see first.
- Your clinic credited on every Houston 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 Houston
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