Great Falls pollen forecast - today, tomorrow and the week ahead

Today (16 July) pollen in Great Falls is medium; grass is medium; oak and ragweed are low. Tomorrow (17 July 2026) levels are similar. Over the following five days oak and ragweed will increase; grass will decrease. Forecasts are calculated by Airmine using satellites to map local vegetation and determine pollen season onset.

For long term forecasts and maps, see the Airmine app

Download on the App Store Get it on Google Play

Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team

Use our Strava plugin to check your own exposure.

How to connect?

Great Falls's Montana Missouri River setting features cottonwood, Russian olive, and sagebrush as the main pollen sources, with exposure varying between the irrigated riverside residential areas and the surrounding high plains desert and Montana farmland. The Missouri River corridor is a particularly significant local source, while the Rocky Mountain Front Range to the west creates chinook wind conditions that can rapidly modify pollen dispersal and the open plains allow wide dispersal.

Today - 16 July

  • Alder (Alnus):

    None

    0/100

  • Birch (Betula):

    None

    0/100

  • Hazel (Corylus):

    None

    0/100

  • Cypress (Cupressaceae):

    None

    0/100

  • Grass (Poaceae):

    Medium

    50/100

  • Oak (Quercus):

    Low

    19/100

  • Willow (Salicaceae):

    None

    0/100

  • Mugwort (Artemisia):

    None

    0/100

  • Ragweed (Ambrosia):

    Low

    20/100

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 - 17 July

  • Alder (Alnus):

    None

    0/100

  • Birch (Betula):

    None

    0/100

  • Hazel (Corylus):

    None

    0/100

  • Cypress (Cupressaceae):

    None

    0/100

  • Grass (Poaceae):

    Medium

    35/100

  • Oak (Quercus):

    Low

    5/100

  • Willow (Salicaceae):

    None

    0/100

  • Mugwort (Artemisia):

    None

    0/100

  • Ragweed (Ambrosia):

    Low

    6/100

Air quality in Great Falls

View air quality

Frequently Asked Questions

Is pollen high in Great Falls right now?

On 16 July 2026, overall pollen levels in Great Falls are moderate. Grass is the main contributor to airborne pollen, while ambrosia and oak remain at lower levels

Will pollen levels change in Great Falls tomorrow?

On 17 July 2026, pollen conditions in Great Falls will be similar to today, with ambrosia at low levels, grass at medium levels, oak at low levels

Is pollen expected to decrease in Great Falls this week?

According to the five-day outlook, grass pollen levels are expected to gradually decrease, while ambrosia and oak pollen will increase, suggesting mixed conditions later in the week.

Which pollen types are currently active in Great Falls?

On 16 July 2026, Grass is the dominant pollen source in Great Falls. ambrosia and oak are also present but at lower levels. willow, alder, artemisia, birch, and cypress are not currently active.

When is pollen season in Great Falls?
Great Falls's Montana high plains setting on the Missouri River produces a season opening in late March with cottonwood and elm before grass from surrounding Montana plains peaks through May and June. Mugwort from surrounding high desert and rangeland extends exposure into September, while the dry, windy continental climate means fewer rainfall interruptions and the Front Range of the Rocky Mountains concentrates pollen under certain wind conditions.
How often is the Great Falls pollen forecast updated?

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

Does pollen in Great Falls 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 Great Falls 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 Great Falls, 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?

Atlanta Boston Chicago Dallas Houston Los Angeles Miami New York Philadelphia

Check pollen in other popular cities:

Rio de Janeiro Copenhagen Athens Denpasar Rome Cape Town Barcelona London Los Angeles New York

Data provided by Airmine — Last update: 16 July 2026 at 10:33 CEST (Data is updated four times daily.)

This page provides the latest public pollen forecast for Great Falls.

For long term forecasts and maps, see the Airmine app

Download on the App Store Get it on Google Play

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