West Yellowstone pollen forecast - today, tomorrow and the week ahead

Today (9 August) pollen in West Yellowstone is high; ragweed is high; grass and mugwort are low. Tomorrow (10 August 2026) levels are similar. Over the following five days grass, mugwort, and ragweed will increase. Forecasts are calculated by Airmine using satellites to map local vegetation and determine pollen season onset.

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West Yellowstone's setting on a high plateau at the western entrance to Yellowstone National Park supports lodgepole pine forest, sagebrush meadows, and willow along the creeks 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. The mix of native and introduced species here is fairly typical for this part of the country.

Today - 9 August

  • Alder (Alnus):

    None

    0/100

  • Birch (Betula):

    None

    0/100

  • Hazel (Corylus):

    None

    0/100

  • Cypress (Cupressaceae):

    None

    0/100

  • Grass (Poaceae):

    Low

    19/100

  • Willow (Salicaceae):

    None

    0/100

  • Mugwort (Artemisia):

    Low

    16/100

  • Ragweed (Ambrosia):

    High

    58/100

High pollen levels may trigger sneezing, itchy eyes, and congestion. Airmine's neighbourhood estimates use satellites to map local vegetation and a statistical prediction model, updated four times daily.

Tomorrow - 10 August

  • Alder (Alnus):

    None

    0/100

  • Birch (Betula):

    None

    0/100

  • Hazel (Corylus):

    None

    0/100

  • Cypress (Cupressaceae):

    None

    0/100

  • Grass (Poaceae):

    Low

    21/100

  • Willow (Salicaceae):

    None

    0/100

  • Mugwort (Artemisia):

    Low

    20/100

  • Ragweed (Ambrosia):

    High

    63/100

Air quality in West Yellowstone

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Frequently Asked Questions

Is pollen high in West Yellowstone right now?

On 9 August 2026, overall pollen levels in West Yellowstone are high. Ambrosia is the main contributor to airborne pollen, while artemisia and grass remain at lower levels

Will pollen levels change in West Yellowstone tomorrow?

On 10 August 2026, pollen conditions in West Yellowstone will be similar to today, with ambrosia at high levels, artemisia at low levels, grass at low levels

Is pollen expected to decrease in West Yellowstone this week?

According to the five-day outlook, ambrosia, artemisia, and grass pollen levels will increase later in the week.

Which pollen types are currently active in West Yellowstone?

On 9 August 2026, Ambrosia is the dominant pollen source in West Yellowstone. artemisia and grass are also present but at lower levels. cypress are not currently active.

When is pollen season in West Yellowstone?
West Yellowstone's pollen season opens with juniper and cottonwood from March before ash extends the tree season through April. Grass follows, peaking through May and June, while grass pollen lingers into early September before tapering off. The semi-arid high-elevation climate means fewer rainfall interruptions than in wetter US regions throughout the year.
How often is the West Yellowstone pollen forecast updated?

The West Yellowstone pollen forecast is updated four times daily. See the timestamp below for the most recent update.

Does pollen in West Yellowstone 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 West Yellowstone 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 West Yellowstone, 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.

Want to see pollen forecasts for other cities in United States?

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Data provided by Airmine — Last update: 10 August 2026 at 02:34 CEST (Data is updated four times daily.)

This page provides the latest public pollen forecast for West Yellowstone.

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Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.

Disclaimer: Forecasts are provided for informational purposes only and should not be relied upon as medical advice. Actual pollen and air quality conditions may vary from the forecast. If you have allergies, asthma, or another medical condition, consult a healthcare professional. Please see our Terms of Service for important information about limitations of liability.