Pollen Count in Chelmsford
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In Chelmsford, pollen seasons start in late March and last until late August. Tree pollen is the first to appear, coming from trees like oak, birch, and hazel.
Updated: 3/23/2026
In May, grass pollen takes over, making it a difficult time for people with allergies. This is usually the worst time for pollen in Chelmsford.
Weed pollen arrives in June and stays until late August. This type of pollen comes from plants like nettle, dock, and sorrel.
Chelmsford's pollen counts are usually highest on warm, sunny days and lowest on cool, rainy days. Pollen counts are highest in the morning and decrease at night.
Pollen Forecast Chart
Recommendations
When pollen concentrations reach a peak, we suggest these simple steps to help with hay fever. These tips are extra important on windy days when plants are in peak anthesis (the time when they release the most pollen).
- Wear masks if necessary
- Shower after going out
- Wear sunglasses if windy
- Close windows and doors
- Use an indoor air purifier
- Avoid wearing woolen clothes outside
- Limit outdoor activities
Annual Pollen Overview
Check out this month-by-month overview of the daily average pollen count in Chelmsford 🌾. This data is based on previous years and serves as a guideline to help you understand when different pollen seasons typically occur in your city.
| Alder | Birch | Grass | Mugwort | Olive | Ragweed | |
|---|---|---|---|---|---|---|
| Jan | 0.3 | 0 | 0 | 0 | 0 | 0 |
| Feb | 15.1 | 0 | 0 | 0 | 0 | 0 |
| Mar | 38.2 | 100.8 | 0 | 0 | 0 | 0 |
| Apr | 0.5 | 437.2 | 3.2 | 0 | 0.3 | 0 |
| May | 0 | 8.3 | 85.6 | 0 | 2.4 | 0 |
| Jun | 0 | 0.2 | 1188.4 | 38.9 | 0 | 0 |
| Jul | 0 | 0 | 383.7 | 161.2 | 0 | 0 |
| Aug | 0 | 0 | 70.7 | 33.9 | 0 | 0.3 |
| Sep | 0 | 0 | 4.4 | 0.6 | 0 | 6 |
| Oct | 0 | 0 | 0 | 0 | 0 | 0 |
| Nov | 0 | 0 | 0 | 0 | 0 | 0 |
| Dec | 0 | 0 | 0 | 0 | 0 | 0 |
(16 km)