Montréal Pollen Forecast - Today, Tomorrow and the Week Ahead
Pollen Today
Today (16 October) pollen in Montréal is low; mugwort, ragweed, mold (alternaria), and mold (cladosporium) are low.
Pollen Tomorrow
Tomorrow (17 October 2026) mold (cladosporium) remains low, mugwort no longer expected, ragweed no longer expected, mold (alternaria) no longer expected.
7-Day Trend
Over the next week mugwort, ragweed, mold (alternaria), and mold (cladosporium) will increase; grass will remain stable.
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Pollen Risk
Today - 16 October
| 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) | None | 0/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | Low | 8/100 |
| Ragweed (Ambrosia) | Low | 14/100 |
| Mold (Alternaria) | Low | 2/100 |
| Mold (Cladosporium) | Low | 11/100 |
Tomorrow - 17 October
| 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) | None | 0/100 | |
| Mold (Alternaria) | None | 0/100 | |
| Mold (Cladosporium) | Low | 4/100 |
Local Environmental Conditions
Montreal's pollen comes from its trees, its lawns and one particularly troublesome weed. Maple, birch, ash, poplar, alder and elm grow along the city's streets and in large parks such as Mount Royal, the Parc Jean-Drapeau islands and the woodlands along the St. Lawrence. Lawns, sports fields and the farmland around the island supply grass pollen. Ragweed is a major allergen across southern Quebec, growing on vacant lots, roadsides, construction sites and in sidewalk cracks, and is the main cause of late-summer hay fever in Montreal.
Montreal's pollen season is short but intense. Long, cold winters, averaging around -10°C in January, hold the trees back until late March or April, when alder, maple and elm begin to flower. Birch, poplar, ash and oak follow in May, bringing the highest tree pollen counts of the year. Grass pollen peaks in June and July, when temperatures average around 21°C. Ragweed takes over from late July or early August and usually peaks in late August, until the first frost in Montreal, often in early October.
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Resource Hub
Pollen forecast neighborhoods 46 neighborhoods
Sports venues in Montréal 8 sports venues
Popular Local Routes 1 route
Local parkruns 4 parkruns
Local events 2 events
Frequently Asked Questions About Pollen in Quebec
Is pollen high in Montréal right now?
On 16 October 2026, overall pollen levels in Montréal are low. Mugwort is the main contributor to airborne pollen, while ragweed remain at lower levels
Will pollen levels change in Montréal tomorrow?
On 17 October 2026, pollen conditions in Montréal will be similar to today with no significant pollen expected.
Is pollen expected to decrease in Montréal this week?
According to the five-day outlook, mugwort and ragweed pollen levels will increase later in the week.
Which pollen types are currently active in Montréal?
On 16 October 2026, Mugwort is the dominant pollen source in Montréal. ragweed are also present but at lower levels. grass are not currently active.
When is pollen season in Montréal?
How often is the Montréal pollen forecast updated?
The Montréal pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Montréal 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 Montréal 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 Montréal, 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 pollen scores represent risk levels, not direct pollen measurements. Higher scores indicate higher risk.
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).
