Houston Pollen Count Today
Houston, TX · Monday, September 21, 2026
TreesNone
0 grains/m³
GrassNone
0 grains/m³
WeedsMedium
46 grains/m³
MoldMedium
7,545 spores/m³
Pollen: Medium. Mold: Medium.
Last 60 reporting days
Full trends →Trees
10
Jul 23Aug 11Aug 31Sep 21
Grass
20100
Jul 23Aug 11Aug 31Sep 21
Weeds
100500
Jul 23Aug 11Aug 31Sep 21
Mold
20,00010,0000
Jul 23Aug 11Aug 31Sep 21
Past year
Trees
5,0002,5000
Sep 23Jan 23May 20Sep 21
Grass
50250
Sep 23Jan 23May 20Sep 21
Weeds
2,0001,0000
Sep 23Jan 23May 20Sep 21
Mold
50,00025,0000
Sep 23Jan 23May 20Sep 21
Top allergens today
Pollen
| Ragweed (Ambrosia) | 42 |
| Amaranth (Chenopodiaceae/ Amaranthaceae) | 4 |
Mold
| Cladosporium | 3,146 |
| Ascospores | 3,110 |
| Basidiomycetes | 583 |
| Penicillium/Aspergillus | 344 |
| Curvularia | 127 |
Explore Houston's pollen & mold
Full daily reportEvery type, with the species breakdownTree & grass pollenOak, pecan, cedar & grassWeed pollenRagweed & other fall triggersMold countOutdoor spore levelsAllergen directoryEvery pollen & mold trackedTrends & seasonWhen pollen is worst in HoustonCedar feverWinter mountain-cedar seasonRagweed seasonWhen it starts, peaks & ends
About these counts
HoustonPollen.com publishes the actual pollen and mold counts measured by the Houston Health Department — not a forecast model. Counts cover tree, grass and weed pollen plus mold spores, with a species-level breakdown, and are released on weekdays (excluding City of Houston holidays). See the full report,trends, or how the scale works.