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