La Grande pollen forecast - today, tomorrow and the week ahead

Today (9 August) pollen in La Grande is medium; mugwort and ragweed are medium. Tomorrow (10 August 2026) levels are similar - mugwort remains medium, ragweed remains medium, grass at low levels. 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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The vegetation around La Grande, on the Grande Ronde Valley in the Blue Mountains, is dominated by ponderosa pine and farmland crops, with cottonwood along the river adding further seasonal pollen exposure. Local parks and open ground tend to see higher pollen counts than the denser urban core. None of this differs sharply from one year to the next barring unusual weather.

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):

    None

    0/100

  • Willow (Salicaceae):

    None

    0/100

  • Mugwort (Artemisia):

    Medium

    28/100

  • Ragweed (Ambrosia):

    Medium

    26/100

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

    5/100

  • Willow (Salicaceae):

    None

    0/100

  • Mugwort (Artemisia):

    Medium

    36/100

  • Ragweed (Ambrosia):

    Medium

    38/100

Air quality in La Grande

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Frequently Asked Questions

Is pollen high in La Grande right now?

On 9 August 2026, overall pollen levels in La Grande are moderate. Ambrosia is the main contributor to airborne pollen, while artemisia remain at lower levels

Will pollen levels change in La Grande tomorrow?

On 10 August 2026, pollen conditions in La Grande will be different from today, with ambrosia at medium levels, artemisia at medium levels, grass at low levels

Is pollen expected to decrease in La Grande 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 La Grande?

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

When is pollen season in La Grande?
La Grande's tree pollen season begins with alder and birch from February before maple peaks during March and April. A grass pollen peak follows through May and June; dock and mugwort keep weed pollen elevated into September. The mild, wet Pacific Northwest climate and frequent spring rain periodically wash pollen from the air throughout the year.
How often is the La Grande pollen forecast updated?

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

Does pollen in La Grande 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 La Grande 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 La Grande, 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 La Grande.

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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.