Bozeman pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Bozeman is moderate; ragweed is moderate; grass and mugwort are low.
Pollen Tomorrow
Tomorrow (21 September 2026) grass remains low, mugwort increasing, ragweed increasing.
7-Day Trend
Over the next week grass, mugwort, and ragweed will decrease.
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Pollen Risk
Today - 20 September
| Pollen species | Level | Value |
|---|---|---|
| Alder (Alnus) | None | 0/100 |
| Birch (Betula) | None | 0/100 |
| Hazel (Corylus) | None | 0/100 |
| Cypress (Cupressaceae) | None | 0/100 |
| Grass (Poaceae) | Low | 10/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | Low | 16/100 |
| Ragweed (Ambrosia) | Moderate | 47/100 |
Tomorrow - 21 September
| Pollen species | Level | Value | 7-Day Trend |
|---|---|---|---|
| Alder (Alnus) | None | 0/100 | — |
| Birch (Betula) | None | 0/100 | — |
| Hazel (Corylus) | None | 0/100 | — |
| Cypress (Cupressaceae) | None | 0/100 | — |
| Grass (Poaceae) | Low | 24/100 | |
| Willow (Salicaceae) | None | 0/100 | — |
| Mugwort (Artemisia) | Moderate | 30/100 | |
| Ragweed (Ambrosia) | High | 59/100 |
Local Environmental Conditions
Bozeman's Gallatin River valley Montana setting features cottonwood, alder, and ponderosa pine as the main tree pollen sources, with exposure varying between the wooded Gallatin River corridor and the ponderosa pine-covered Bridger Range and the more built-up commercial corridors along Main Street. The Gallatin River corridor is a particularly significant local source, while the mountain-valley elevation gradient creates distinct pollen zones between the forested ranges and the agricultural valley floor.
Bozeman's Montana Rocky Mountain setting at elevation produces a season opening in late March with cottonwood and alder before grass from surrounding mountain valley farmland peaks through May and June. Mugwort from surrounding rangeland extends exposure into September, while the Gallatin River valley concentrates pollen and the elevated Rocky Mountain setting means a more compressed season than in lower elevation cities.
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Resource Hub
Pollen forecast neighborhoods 1 neighborhood
Sports venues in Bozeman 1 sports venue
Frequently Asked Questions About Pollen in Montana
Is pollen high in Bozeman right now?
On 20 September 2026, overall pollen levels in Bozeman are moderate. Ambrosia is the main contributor to airborne pollen, while artemisia and grass remain at lower levels
Will pollen levels change in Bozeman tomorrow?
On 21 September 2026, pollen conditions in Bozeman will be different from today, with grass at low levels and ambrosia, artemisia increasing
Is pollen expected to decrease in Bozeman this week?
According to the five-day outlook, ambrosia, artemisia, and grass pollen levels are expected to gradually decrease, suggesting improving conditions later in the week.
Which pollen types are currently active in Bozeman?
On 20 September 2026, Ambrosia is the dominant pollen source in Bozeman. artemisia and grass are also present but at lower levels.
When is pollen season in Bozeman?
How often is the Bozeman pollen forecast updated?
The Bozeman pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Bozeman come from nearby or far away?
Studies show that most pollen exposure (often 70–90%) comes from nearby sources, such as local trees and vegetation. A good pollen forecast therefore depends on accurately representing local vegetation. Pollen can travel long distances, but this usually matters only early in the season or during specific wind events.
Are pollen levels in Bozeman based on measurements or forecasts?
Pollen data is often misunderstood. Most "pollen levels" are not real-time measurements, but forecasts.
Direct pollen measurements are typically delayed by 1-2 days because they require manual analysis. To show current conditions in Bozeman, modern forecasts combine recent measurements, weather data, and information about local vegetation.
This allows us to estimate pollen levels for today and the coming days, not just report the past.
Airmine’s atmospheric monitoring platform was developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team, using satellite and Earth observation technologies to improve emissions monitoring.
Understanding the Scale
The 0–100 scores represent risk levels, not direct measurements of pollen or air pollutant concentrations. Higher scores indicate higher risk. Pollen and air quality use different thresholds.
Pollen
| None | 0 | No or negligible risk of exposure. Pollen/mold exposure is expected to be minimal. |
| Low | 0-25 | Low risk of exposure. Small amounts of pollen or mold spores may be present. |
| Moderate | 25-50 | Moderate risk of exposure. Pollen/mold exposure is expected to be noticeable. |
| High | 50-75 | High risk of exposure. Elevated pollen/mold exposure is expected. |
| Very High | 75-100 | Very high risk of exposure. Pollen/mold exposure is expected to be at or near its highest levels. |
Get More in the Airmine Pollen app
Get 15-day pollen forecasts with morning, afternoon and evening detail, plus 5-day air quality forecasts. Explore interactive pollen risk maps, estimated pollen season start, route profiles and a symptoms diary.
Features and forecast availability vary by region. Currently covering Europe, the contiguous US, southern Canada, South Africa, Australia, Indonesia (Java & Bali), Brazil, Paraguay, Uruguay and the Buenos Aires area.
Developed with support from the European Space Agency (ESA) Business Applications and Space Solutions (BASS).
