Silverton pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Silverton is low; ragweed is low.
Pollen Tomorrow
Tomorrow (21 September 2026) ragweed increasing.
7-Day Trend
Over the next week mugwort will increase; grass and ragweed will remain stable.
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Features and forecast availability vary by region.
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) | None | 0/100 |
| Ragweed (Ambrosia) | Low | 24/100 |
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) | None | 0/100 | |
| Willow (Salicaceae) | None | 0/100 | — |
| Mugwort (Artemisia) | None | 0/100 | |
| Ragweed (Ambrosia) | Moderate | 30/100 |
Local Environmental Conditions
Silverton sits on a high mountain town at over 9,300 feet in the San Juans, where the dominant vegetation is a mix of Engelmann spruce, alpine wildflower meadows, and willow along the creek, shaping the local pollen profile across the seasons. Exposure varies with proximity to green space versus the more built-up parts of Silverton. The mix of native and introduced species here is fairly typical for this part of the country.
Silverton's tree pollen season begins with juniper and cottonwood from March with ash joining in and continuing through April. A grass pollen peak follows through May and June; sagebrush and ragweed extend the season into September. The dry mountain climate offers fewer rain breaks than more humid parts of the country.
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Pollen forecast neighborhoods 1 neighborhood
Frequently Asked Questions About Pollen in Colorado
Is pollen high in Silverton right now?
On 20 September 2026, overall pollen levels in Silverton are low. Ambrosia is the main contributor to airborne pollen
Will pollen levels change in Silverton tomorrow?
On 21 September 2026, pollen conditions in Silverton will be different from today, with ambrosia increasing
Is pollen expected to decrease in Silverton this week?
According to the five-day outlook, artemisia pollen levels will increase later in the week.
Which pollen types are currently active in Silverton?
On 20 September 2026, Ambrosia is the dominant pollen source in Silverton. artemisia and grass are not currently active.
When is pollen season in Silverton?
How often is the Silverton pollen forecast updated?
The Silverton pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Silverton 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 Silverton 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 Silverton, 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).
