Coeur d'Alene pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Coeur d'Alene is high; ragweed is high; grass is moderate; mugwort is low.
Pollen Tomorrow
Tomorrow (21 September 2026) levels are similar to today.
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) | Moderate | 37/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | Low | 7/100 |
| Ragweed (Ambrosia) | High | 56/100 |
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 | 37/100 | |
| Willow (Salicaceae) | None | 0/100 | — |
| Mugwort (Artemisia) | Low | 9/100 | |
| Ragweed (Ambrosia) | High | 56/100 |
Local Environmental Conditions
Coeur d'Alene's parks, including Tubbs Hill and the Lake Coeur d'Alene shoreline, feature pine, birch, and western red cedar as the main tree pollen sources, with exposure varying between these green areas and the more built-up city centre. Surrounding Idaho Panhandle woodland and the Bitterroot Mountain foothills contribute substantial tree and grass pollen, while the lake position can moderate local airflows and periodically disperse urban pollen.
Coeur d'Alene's pollen season opens with birch and pine from late February, followed by western red cedar through March and April. Grass pollen peaks through June and July. The Lake Coeur d'Alene position means onshore lake breezes can periodically moderate pollen levels, while surrounding Idaho Panhandle woodland and the Bitterroot Mountain foothills contribute substantial tree pollen. The season is shorter than in southern US cities due to the northern inland climate.
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Frequently Asked Questions About Pollen in Idaho
Is pollen high in Coeur d'Alene right now?
On 20 September 2026, overall pollen levels in Coeur d'Alene are high. Ambrosia is the main contributor to airborne pollen, while grass and artemisia remain at lower levels
Will pollen levels change in Coeur d'Alene tomorrow?
On 21 September 2026, pollen conditions in Coeur d'Alene will be similar to today, with grass at moderate levels, ambrosia at high levels, artemisia at low levels
Is pollen expected to decrease in Coeur d'Alene this week?
According to the five-day outlook, grass, ambrosia, and artemisia pollen levels are expected to gradually decrease, suggesting improving conditions later in the week.
Which pollen types are currently active in Coeur d'Alene?
On 20 September 2026, Ambrosia is the dominant pollen source in Coeur d'Alene. grass and artemisia are also present but at lower levels.
When is pollen season in Coeur d'Alene?
How often is the Coeur d'Alene pollen forecast updated?
The Coeur d'Alene pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Coeur d'Alene 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 Coeur d'Alene 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 Coeur d'Alene, 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).
