Coos Bay pollen forecast — Old Macdonald – Old Macdonald Course neighborhood
Pollen Today
Today (20 September) pollen in Old Macdonald – Old Macdonald Course, Coos Bay is moderate; ragweed is moderate; grass and mugwort are low.
Pollen Tomorrow
Tomorrow (21 September 2026) grass remains low, ragweed remains moderate, mugwort increasing.
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) | Low | 1/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | Low | 23/100 |
| Ragweed (Ambrosia) | Moderate | 34/100 |
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) | Low | 5/100 | |
| Willow (Salicaceae) | None | 0/100 | — |
| Mugwort (Artemisia) | Moderate | 27/100 | |
| Ragweed (Ambrosia) | Moderate | 38/100 |
Local Environmental Conditions
Old Macdonald's Oregon coast setting features coastal grasses, shore pine, and gorse as the main pollen sources across the links-style course, with exposure varying between the exposed Pacific Ocean-facing holes and the more sheltered inland sections. The Pacific Ocean position means strong onshore winds frequently disperse pollen, while the very wet Oregon coast climate provides very frequent rainfall interruptions throughout the long spring and summer season.
Coos Bay's regional pollen pattern holds at Old Macdonald – Old Macdonald Course, with alder and birch first appearing in February then maple builds through March and April. Grass pollen then peaks through May and June, and dock and mugwort keep weed pollen elevated into September. Frequent spring rain across the Pacific Northwest periodically clears pollen from the air, moderating peak counts.
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Sports venues in Coos Bay 6 sports venues
Frequently Asked Questions About Pollen in Oregon
Is pollen high in Coos Bay right now?
On 20 September 2026, overall pollen levels in Coos Bay are moderate. Ambrosia is the main contributor to airborne pollen, while artemisia and grass remain at lower levels
Will pollen levels change in Coos Bay tomorrow?
On 21 September 2026, pollen conditions in Coos Bay will be different from today, with ambrosia at moderate levels, grass at low levels and artemisia increasing
Is pollen expected to decrease in Coos Bay this week?
According to the five-day outlook, ambrosia, artemisia, and grass pollen levels are expected to gradually decrease, suggesting improving conditions later in the week.
Which pollen types are currently active in Coos Bay?
On 20 September 2026, Ambrosia is the dominant pollen source in Coos Bay. artemisia and grass are also present but at lower levels.
When is pollen season in Coos Bay?
How often is the Coos Bay pollen forecast updated?
The Coos Bay pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Coos Bay 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 Coos Bay 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 Coos Bay, 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).
