CO · Allergy Season Guide
Denver Allergy Season Guide
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.
PollyMap is actively looking for a qualified local partner in Denver.
We're recruiting a qualified local allergy clinic, naturopathic clinic, university, environmental health professional, or other qualified organization to become the official pollen collection partner for Denver.
Become the Official PollyMap Partner for DenverSummary
PollyMap does not yet have weekly collected pollen data for Denver. This guide is based on regional climate patterns and historical allergen data while we recruit a local collection partner. Tree pollen peaks in spring, grass pollen in late spring and early summer, and weed pollen in late summer and fall.
Local allergy guide for Denver
Denver shares Colorado's a high-elevation semi-arid to alpine climate with cold winters, warm dry summers, and dramatic day-night temperature swings. at 5,280 ft elevation.
Denver at 5,280 ft elevation sits within Colorado's broader regional climate.
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.
Denver's local mold profile includes Cladosporium, Alternaria. Spore counts tend to peak after rainfall and during the warm, humid portion of the year.
Local weather — temperature, rainfall, wind, and humidity — drives day-to-day pollen levels. Dry, windy days following warm weather typically produce the highest counts, while heavy rain temporarily clears the air.
Denver monthly allergy calendar
Typical month-by-month intensity for the four major airborne allergen categories in Denver.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Tree | Low | Mod | High | V.High | V.High | High | Mod | Low | Low | Low | Low | Low |
| Grass | — | — | Low | Mod | High | V.High | High | Mod | Low | Low | — | — |
| Weed | Low | Low | Low | Mod | Mod | Mod | High | V.High | V.High | High | Mod | Low |
| Mold | Low | Low | Mod | Mod | Mod | Mod | High | High | Mod | Mod | Low | Low |
Most common local pollens — trees
Most common local pollens — weeds
Most common airborne molds
Current PollyMap data for Denver
Official PollyMap Partner in Denver
Frequently asked questions about allergies in Denver
The PollyKit — $39.99
Test the air at your exact address.
Test the air at your exact address — not a regional forecast, your actual air. Tests for pollen, mold spores, dust mites, and other airborne particles. Ships nationwide. Results in 3–5 days.
- 1
Hang
Hang the PollyKit indoors or outdoors at your home, office, or classroom for 24–48 hours.
- 2
Return
Mail it back in the included prepaid envelope.
- 3
Results
Receive your personal lab report showing what's actually in your air.
Related guides
State Guide
Colorado Allergy Season Guide
Nearby city
Colorado Springs Allergy Season Guide
Nearby city
Aurora Allergy Season Guide
Nearby city
Fort Collins Allergy Season Guide
Nearby city
Lakewood Allergy Season Guide
Library
Pollen species library
Library
Mold species library
Reports
Latest PollyMap reports
Partners
Become a partner
Get local pollen alerts for Denver.
Subscribe and we'll email you when new local reports are published.
Subscribe to alerts