Stow, Massachusetts pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Stow, Massachusetts is low; grass and ragweed are low.
Pollen Tomorrow
Tomorrow (21 September 2026) grass increasing, ragweed increasing, mugwort at low levels.
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 | 23/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | None | 0/100 |
| Ragweed (Ambrosia) | Low | 23/100 |
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) | High | 55/100 | |
| Willow (Salicaceae) | None | 0/100 | — |
| Mugwort (Artemisia) | Low | 18/100 | |
| Ragweed (Ambrosia) | High | 55/100 |
Local Environmental Conditions
In Stow, moisture-loving hazel and willow dominate the bank, both quick to release pollen on the wind; this sits in the vicinity. A stand of oak and birch, the latter ranked among the region's most potent tree allergens, a short distance from here. Seasonal timing here generally tracks the wider region, give or take a week or so.
Around Stow, the nearby oak and birch stands take the lead as spring progresses, reaching maximum intensity across the April-May window. By late spring, grass pollen is climbing steadily toward a June high point, and then ragweed picks up the slack, running from mid-August through October. Warmer or wetter years can pull these peaks a week or two earlier or later.
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Resource Hub
Sports venues in Stow, Massachusetts 3 sports venues
Frequently Asked Questions About Pollen in Massachusetts
Is pollen high in Stow, Massachusetts right now?
On 20 September 2026, overall pollen levels in Stow, Massachusetts are low. Ambrosia is the main contributor to airborne pollen, while grass remain at lower levels
Will pollen levels change in Stow, Massachusetts tomorrow?
On 21 September 2026, pollen conditions in Stow, Massachusetts will be different from today, with artemisia at low levels and ambrosia, grass increasing
Is pollen expected to decrease in Stow, Massachusetts 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 Stow, Massachusetts?
On 20 September 2026, Ambrosia is the dominant pollen source in Stow, Massachusetts. grass are also present but at lower levels. artemisia are not currently active.
When is pollen season in Stow, Massachusetts?
How often is the Stow, Massachusetts pollen forecast updated?
The Stow, Massachusetts pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Stow, Massachusetts 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 Stow, Massachusetts 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 Stow, Massachusetts, 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).
