IL pollen report
Chicago Pollen Report
PollyMap is actively seeking a qualified local collection partner in Chicago. This guide uses regional climate and historical allergen data while we recruit a local host.
Collection coming soon to Chicago
PollyMap is actively recruiting a verified local partner in Chicago. Be the first to know — or apply to be the partner.
Pollen patterns in Chicago
In Chicago, tree pollen — including Maple, Oak, Birch — typically dominates from late winter through spring. Bluegrass grass is the most common warm-season pollinator, and Ragweed drives the largest fall pollen load.
Top trees
- Maple
- Oak
- Birch
- Ash
- Walnut
Top grasses
- Bluegrass
- Timothy
- Orchard
- Rye
Top weeds
- Ragweed
- Lamb's quarters
- Pigweed
- Plantain
Top molds
- Alternaria
- Cladosporium
- Aspergillus
- Penicillium
Chicago 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 Chicago
Explore pollen activity in nearby cities reported by the PollyMap network.
Frequently asked questions
When is allergy season in Chicago?
In Chicago, allergy season starts with tree pollen in late winter and early spring, transitions to grass pollen in May and June, and ends with weed pollen — primarily ragweed and sagebrush — from August through October.
What pollen is highest in Chicago?
The most prevalent local pollens in Chicago include Maple, Oak, Birch in the spring season.
What months are worst for allergies in Chicago?
Most Chicago allergy sufferers report the worst symptoms during peak tree pollen in March-May and again during ragweed season in September.
Does Chicago have mold allergies?
Yes. Chicago's climate supports Alternaria and Cladosporium spore exposure, with counts typically peaking in the warm and humid months.
Why are allergies bad in Chicago?
Local geography, climate, and seasonal plant cycles all influence allergen load in Chicago. The combination of regional vegetation and weather creates predictable spring and fall pollen peaks.
Is there a local pollen collection site in Chicago?
Not yet. PollyMap is actively seeking a qualified local allergy clinic or environmental health partner in Chicago to host weekly pollen collection.
How can my clinic become a PollyMap partner in Chicago?
Clinics in Chicago can apply to become the official PollyMap collection partner. Approved partners receive PollyKits weekly, conduct 24-48 hour collections, and mail samples back for microscope analysis.
Bring real pollen data to Chicago.
Become the lead PollyMap collection partner in Chicago and join our national network.
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