Shelby, Montana pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Shelby, Montana is moderate; ragweed is moderate; mugwort is low.
Pollen Tomorrow
Tomorrow (21 September 2026) mugwort increasing, ragweed increasing, grass at moderate levels.
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) | None | 0/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | Low | 12/100 |
| Ragweed (Ambrosia) | Moderate | 44/100 |
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) | Moderate | 26/100 | |
| Willow (Salicaceae) | None | 0/100 | — |
| Mugwort (Artemisia) | Moderate | 37/100 | |
| Ragweed (Ambrosia) | High | 69/100 |
Local Environmental Conditions
Shelby's setting on open high-plains ranchland near the Canadian border in northern Montana supports mixed-grass prairie, wheat fields, and shelterbelt cottonwood as the leading local vegetation, all factoring into the pollen count through the year. Seasonal timing here follows the broader regional pattern typical of this part of the country. Nearby towns with similar terrain tend to see a broadly similar pattern.
The pollen calendar in Shelby opens with juniper and cottonwood starting March before ash extends the tree season through April. Grass pollen rises through May and June, and grass and sagebrush extend exposure into September. Low humidity and high elevation mean pollen disperses easily once released.
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Frequently Asked Questions About Pollen in Montana
Is pollen high in Shelby, Montana right now?
On 20 September 2026, overall pollen levels in Shelby, Montana are moderate. Ambrosia is the main contributor to airborne pollen, while artemisia remain at lower levels
Will pollen levels change in Shelby, Montana tomorrow?
On 21 September 2026, pollen conditions in Shelby, Montana will be different from today, with grass at moderate levels and ambrosia, artemisia increasing
Is pollen expected to decrease in Shelby, Montana 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 Shelby, Montana?
On 20 September 2026, Ambrosia is the dominant pollen source in Shelby, Montana. artemisia are also present but at lower levels. grass are not currently active.
When is pollen season in Shelby, Montana?
How often is the Shelby, Montana pollen forecast updated?
The Shelby, Montana pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Shelby, Montana 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 Shelby, Montana 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 Shelby, Montana, 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).
