Houston, TX Ragweed Pollen
Ragweed pollen in Houston usually peaks around September, reaching Very High at its worst. Houston sits on the humid Gulf coast, far from the Hill Country cedar that defines central Texas. Its allergy year leans on a big oak and pine spring, grass through the long warm season, and ragweed in fall.
Ragweed peaks in September along the coastal plain, the last big push of the Houston allergy year.
Ragweed in Houston today
Monday, July 27, 2026
Ragweed pollen by month in Houston
How ragweed usually runs across the year. The current month is outlined.
Managing ragweed season in Houston
If ragweed is your trigger, start a daily antihistamine like cetirizine (Zyrtec) or loratadine (Claritin) a week or two before the September peak, rather than waiting for symptoms. Keep windows closed on high-count mornings, shower and change clothes after time outside, and run the AC on recirculate in the car.
When symptoms don't ease with over-the-counter medicine, an allergist in Texas can test whether ragweed is really what you react to and talk through longer-term options like allergy shots.
Sources
More pollen in Houston
- Houston oak pollen — peaks March.
- Houston grass pollen — peaks May.
- Houston pine pollen — peaks late February and March.
- Houston pollen calendar — every allergen, month by month.
- Houston pollen count today — live tree, grass, and weed levels with a 5-day forecast.
- Texas pollen season — the statewide calendar and other cities.
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Sign up for free alertsSeasonal pattern based on Texas pollen data and local sources. Today's reading updated daily. MyPollenPal