MT · Allergy Season Guide
Montana Allergy Season Guide
Montana experiences a high-elevation semi-arid to alpine climate with cold winters, warm dry summers, and dramatic day-night temperature swings.
Summary
Montana has 0 active PollyMap collection sites, and is seeking partners in 5 additional cities. Tree pollen typically dominates early spring, grass pollen peaks in late spring and early summer, and weed pollen (including ragweed) extends from late summer through fall.
PollyMap collection status across Montana
Statewide allergy overview
Montana experiences a high-elevation semi-arid to alpine climate with cold winters, warm dry summers, and dramatic day-night temperature swings.
Juniper, cedar, and cottonwood drive an early-spring tree season. Grasses peak in early summer and sagebrush is the dominant fall weed.
Mold counts are typically lower at altitude but spike after monsoon storms and irrigated agricultural cycles in the lower valleys.
Allergy patterns vary by elevation and proximity to coast or mountains within Montana, but most of the state shares a common seasonal rhythm of spring tree pollen, summer grass pollen, and late-summer to fall weed pollen.
Montana allergy calendar
Month-by-month intensity for the four major airborne allergen categories.
| 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 |
Top tree pollens
Top weed pollens
Top airborne molds
Major city guides in Montana
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Billings
View Billings allergy season guide →
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Missoula
View Missoula allergy season guide →
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Great Falls
View Great Falls allergy season guide →
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Bozeman
View Bozeman allergy season guide →
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Helena
View Helena allergy season guide →
Latest PollyMap reports for Montana
Partner Program
Become a PollyMap Collection Partner in Montana
We work with allergy clinics, naturopathic clinics, universities, and qualified environmental health professionals to build the most reliable, locally-collected pollen network in America.
Partner benefits
- Dedicated local partner profile on PollyMap
- Local exposure to thousands of allergy searchers
- Backlinks from your city and state guide pages
- Lead generation from local allergy patients
- Featured on every local PollyMap report
- Recognition as a pollen data collection center
- Collaboration on local pollen research and reports
Partner requirements
- Receive a PollyKit weekly by mail
- Hang the PollyKit collector for 24–48 hours
- Mail the sample back weekly using prepaid packaging
- Maintain a consistent collection schedule year-round
Test the air at your address
Curious what's actually in the air at your Montana home or office?
The PollyKit is the easiest air-sampling kit on the market — collect outdoor pollen and airborne mold indoors at your home, office, classroom or rental, then mail it in for a full lab report. Just $39.99.
- Outdoor pollen counts
- Indoor airborne mold
- Lab-analyzed results
- Ships nationwide
What's in the box
- Air sampling rodsx2
- Indoor mold slidex1
- Prepaid lab returnincluded
- Personal results report3–5 days
The only consumer kit that pairs outdoor pollen with indoor airborne mold sampling.
Frequently asked questions
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