Caledon pollen forecast — Devil's Pulpit Golf Association – Pulpit Course neighborhood
Pollen Today
Today (20 September) pollen in Devil's Pulpit Golf Association – Pulpit Course, Caledon is moderate; grass and ragweed are moderate; mugwort is low.
Pollen Tomorrow
Tomorrow (21 September 2026) ragweed declining, grass no longer expected, mugwort no longer expected.
7-Day Trend
Over the next week grass, mugwort, and ragweed will increase.
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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 | 36/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | Low | 17/100 |
| Ragweed (Ambrosia) | Moderate | 45/100 |
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) | None | 0/100 | |
| Willow (Salicaceae) | None | 0/100 | — |
| Mugwort (Artemisia) | None | 0/100 | |
| Ragweed (Ambrosia) | Low | 8/100 |
Local Environmental Conditions
Devil's Pulpit's Caledon setting features sugar maple, oak, and white pine as the main pollen sources across this Niagara Escarpment ravine course, with exposure varying between deep wooded valleys and elevated open fairways. The escarpment's Carolinian-transition woodland adds a broad hardwood pollen mix through spring, while surrounding rural Caledon farmland contributes grass and ragweed pollen in summer.
Tree pollen from maple, oak, and pine peaks in May across the escarpment's wooded ravines, followed by grass pollen through June and July in the open fairway corridors. Ragweed builds more mildly here than in urban Toronto, given the rural Caledon surroundings, running from late August through September. Because the rural Caledon setting sees lighter overall pollen loads than urban Toronto, sensitive golfers generally find the course comfortable across most of the season.
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Frequently Asked Questions About Pollen in Ontario
Is pollen high in Caledon right now?
On 20 September 2026, overall pollen levels in Caledon are moderate. Ambrosia is the main contributor to airborne pollen, while grass and artemisia remain at lower levels
Will pollen levels change in Caledon tomorrow?
On 21 September 2026, pollen conditions in Caledon will be different from today, with ambrosia continuing to decline
Is pollen expected to decrease in Caledon 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 Caledon?
On 20 September 2026, Ambrosia is the dominant pollen source in Caledon. grass and artemisia are also present but at lower levels.
When is pollen season in Caledon?
How often is the Caledon pollen forecast updated?
The Caledon pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Caledon 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 Caledon 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 Caledon, 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. |
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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).
