Low
Pollen is low — most people won't notice
Multiple pollen types are active · Tomorrow ↑ · Updated 13 hours ago
Today in Houston: tree pollen is very low, grass pollen is very low, weed pollen is very low. Overall score: 20/100. Allergies are unlikely for most people right now. Multiple pollen types are active. Tomorrow is expected to be higher. Updated at 1:00 AM.
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Pollen levels in Houston are currently low. Most people should not experience allergy symptoms from pollen.
Tree pollen: Very Low. Grass pollen: Very Low. Weed pollen: Very Low.
Tomorrow's pollen forecast for Houston is expected to be higher, with mild pollen conditions.
Multiple pollen types are active in Houston today, so no single supported allergen is clearly highest.
Tree pollen in Houston is very low today.
Grass pollen in Houston is very low today.
Weed pollen in Houston is very low today.
Tomorrow's pollen forecast for Houston is expected to be higher, with mild pollen conditions.
The allergy forecast in Houston is low today based on the supported tree, grass, and weed pollen data shown on this page.
This forecast tracks supported tree, grass, and weed pollen for Houston. Cedar can be part of local tree-pollen season, but this page does not show a separate cedar or mold count unless source data provides it.
Houston's humid subtropical climate, mild winters, and Gulf Coast proximity create one of the most challenging allergy environments in the United States, with an extended pollen season that often spans nearly the entire year.
Tree pollen kicks off as early as December and dominates through spring, with mountain cedar (ashe juniper) triggering the notorious "cedar fever" in January, followed by oak, pine, ash, elm, pecan, and mulberry peaking from February through April—oak alone can blanket the city in visible yellow pollen.
As trees taper, grass pollen takes over from late April through summer and into early fall, driven primarily by Bermuda, Johnson, Bahia, and ryegrass, with Bermuda often producing symptoms well into October thanks to Houston's long warm season.
Weed pollen rises sharply in late summer and fall, with ragweed leading the charge from August through November, alongside pigweed, lamb's quarters, and marsh elder. Overlap between lingering grasses and emerging weeds in late summer frequently intensifies symptoms.
Beyond pollen, Houston's persistent humidity fuels year-round mold growth (especially Alternaria and Cladosporium), while dust mites, urban air pollution, and ozone further aggravate respiratory allergies.
Overall, Houston's allergy profile is defined by a long, overlapping, high-intensity season compounded by humidity and mold.