CO pollen report
Fort Collins Pollen Report
PollyMap is actively seeking a qualified local collection partner in Fort Collins. This guide uses regional climate and historical allergen data while we recruit a local host.
Collection coming soon to Fort Collins
PollyMap is actively recruiting a verified local partner in Fort Collins. Be the first to know — or apply to be the partner.
Pollen patterns in Fort Collins
In Fort Collins, tree pollen — including Juniper, Cedar, Cottonwood — typically dominates from late winter through spring. Brome grass is the most common warm-season pollinator, and Sagebrush drives the largest fall pollen load.
Top trees
- Juniper
- Cedar
- Cottonwood
- Pine
- Aspen
Top grasses
- Brome
- Bluegrass
- Fescue
Top weeds
- Sagebrush
- Ragweed
- Russian thistle
Top molds
- Cladosporium
- Alternaria
Fort Collins 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 Fort Collins
Explore pollen activity in nearby cities reported by the PollyMap network.
Frequently asked questions
When is allergy season in Fort Collins?
In Fort Collins, 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 Fort Collins?
The most prevalent local pollens in Fort Collins include Juniper, Cedar, Cottonwood in the spring season.
What months are worst for allergies in Fort Collins?
Most Fort Collins allergy sufferers report the worst symptoms during peak tree pollen in March-May and again during ragweed season in September.
Does Fort Collins have mold allergies?
Yes. Fort Collins's climate supports Cladosporium and Alternaria spore exposure, with counts typically peaking in the warm and humid months.
Why are allergies bad in Fort Collins?
Local geography, climate, and seasonal plant cycles all influence allergen load in Fort Collins. The combination of regional vegetation and weather creates predictable spring and fall pollen peaks.
Is there a local pollen collection site in Fort Collins?
Not yet. PollyMap is actively seeking a qualified local allergy clinic or environmental health partner in Fort Collins to host weekly pollen collection.
How can my clinic become a PollyMap partner in Fort Collins?
Clinics in Fort Collins 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 Fort Collins.
Become the lead PollyMap collection partner in Fort Collins and join our national network.
Apply today