When is allergy season worst in Saint Louis, MO?

In Saint Louis, allergy season typically peaks with tree pollen in early spring, grass pollen in late spring through summer, and weed pollen (especially ragweed) from late summer into fall. Mold spores rise after wet stretches.

Where can I get tested for allergies in Saint Louis?

PollyMap is recruiting a verified allergy clinic to serve as the Official Collection Partner for Saint Louis. Until then, search for board-certified allergists in the MO area.

How is pollen measured in Saint Louis?

PollyMap partners collect airborne particles with a Rotorod-style sampler placed in Saint Louis, then identify and count tree, grass, weed and mold spores under a microscope each week. These are real counts — not modeled forecasts.

MO pollen report

Saint Louis Pollen Report

Weekly pollen, mold and air quality data for Saint Louis, MO, collected by the PollyMap network.

Collection coming soon to Saint Louis

PollyMap is actively recruiting a verified local partner in Saint Louis. Be the first to know — or apply to be the partner.

Get alerts Become a partner

While we find a local clinic

Test the air at your own home in Saint Louis

No allergy clinic is reporting from Saint Louis 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

Order your PollyKit

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.

Historical reports

No historical reports yet.

Cities near Saint Louis

Explore pollen activity in nearby cities reported by the PollyMap network.

Territory open in Saint Louis

Are you an allergy clinic in Saint Louis? 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 Saint Louis, 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 Saint Louis metro — like a franchise territory. Saint Louis has room for multiple partners, but once your area is assigned, it's locked to your clinic.

No clinic has claimed a territory in Saint Louis 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.

Your clinic credited on every Saint Louis 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 Saint Louis

Claim your Saint Louis, MO territory See current collection sites

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Reach local families checking real pollen conditions in their community.

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Report findings are based on reviewed sample data and are not influenced by sponsors.