Litchfield, Connecticut pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Litchfield, Connecticut is moderate; ragweed is moderate; grass is low.
Pollen Tomorrow
Tomorrow (21 September 2026) ragweed remains moderate, grass 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) | Moderate | 27/100 |
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 | 35/100 | |
| Willow (Salicaceae) | None | 0/100 | — |
| Mugwort (Artemisia) | Low | 12/100 | |
| Ragweed (Ambrosia) | Moderate | 40/100 |
Local Environmental Conditions
Litchfield sits on the rolling hills of the Litchfield Hills, where the dominant vegetation is a mix of sugar maple and oak forest, eastern hemlock, and farmland hedgerows, shaping the local pollen profile across the seasons. Wind patterns across the area help determine how far pollen travels from these source plants. Residents who spend time outdoors around Litchfield typically notice the shift as each season turns over.
Pollen season in Litchfield starts with maple and elm in March before birch and oak takes over and peaks through April and May. Grass follows, peaking through June and July, while ragweed and mugwort keep weed pollen elevated into September. A relatively short growing season compresses tree, grass, and weed pollen into a more intense stretch.
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Frequently Asked Questions About Pollen in Connecticut
Is pollen high in Litchfield, Connecticut right now?
On 20 September 2026, overall pollen levels in Litchfield, Connecticut are moderate. Ambrosia is the main contributor to airborne pollen, while grass remain at lower levels
Will pollen levels change in Litchfield, Connecticut tomorrow?
On 21 September 2026, pollen conditions in Litchfield, Connecticut will be different from today, with ambrosia at moderate levels, artemisia at low levels and grass increasing
Is pollen expected to decrease in Litchfield, Connecticut 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 Litchfield, Connecticut?
On 20 September 2026, Ambrosia is the dominant pollen source in Litchfield, Connecticut. grass are also present but at lower levels. artemisia are not currently active.
When is pollen season in Litchfield, Connecticut?
How often is the Litchfield, Connecticut pollen forecast updated?
The Litchfield, Connecticut pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Litchfield, Connecticut 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 Litchfield, Connecticut 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 Litchfield, Connecticut, 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).
