CO pollen report
Boulder Pollen Report
Boulder sits exactly where the Great Plains meet the Rockies — juniper from the foothills on one side, prairie grass on the other. Elm and cottonwood drive the spring, grasses carry the early summer, and ragweed and sagebrush close out the fall. Chinook winds off the Flatirons keep pollen moving, and the city's open spaces are full of native grasses.
Collection coming soon to Boulder
PollyMap is actively recruiting a verified local partner in Boulder. Be the first to know — or apply to be the partner.
What drives allergies in Boulder
Trees: juniper, elm, and cottonwood (March – June)
Rocky Mountain juniper and Siberian elm open the season; cottonwoods (Populus) along Boulder Creek peak in May.
Grasses: bluegrass and native grasses (May – July)
Irrigated lawns and the open space system's native prairie grasses pollinate heavily in June.
Weeds: ragweed and sagebrush (August – October)
Ragweed (Ambrosia) and sagebrush (Artemisia) dominate the fall across the Front Range.
Mold: low, irrigation-linked
The dry climate keeps mold modest, with rises in irrigated landscapes and after summer storms.
Historical reports
Cities near Boulder
Explore pollen activity in nearby cities reported by the PollyMap network.
Frequently asked questions
What is the pollen count in Boulder today?
PollyMap publishes real, microscope-verified pollen counts for Boulder — measured from physical air samples. The latest report on this page shows current tree, grass, weed, and mold levels.
Is the pollen count high in Boulder right now?
Boulder's worst stretches are April–May (elm, cottonwood, juniper), June (grasses), and September (ragweed, sagebrush). The measured reports on this page show today's actual levels.
When is allergy season in Boulder?
March through October: trees in spring, grasses in early summer, and ragweed and sagebrush in the fall.
Do the mountains protect Boulder from pollen?
The opposite — Boulder gets pollen from both ecosystems: foothill juniper and pine from the west, prairie grasses and weeds from the east.
Are you an allergy clinic in Boulder? 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 Boulder, 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 Boulder metro — like a franchise territory. Boulder has room for multiple partners, but once your area is assigned, it's locked to your clinic.
No clinic has claimed a territory in Boulder 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.
Boulder, Louisville, Lafayette, and Longmont each make natural PollyMap territories. The first allergy clinic in each area becomes its credited pollen expert.
- Your clinic credited on every Boulder 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 Boulder