Pollen Count in Heidelberg
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Tree pollen season in Heidelberg starts in March and ends in May. This is when trees like oak, birch, and hazel release pollen into the air.
Updated: 2/11/2026
Grass pollen season is next, from May to July. This is when many types of grass release pollen. It's a busy time for pollens in Heidelberg!
Weed pollen season is from July to September. Weeds like nettle and sorrel release pollen during this time. It's still important to be aware of pollen counts.
The pollen season ends in September. Heidelberg's pollen seasons are important to know for people who want to enjoy the outdoors.
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 Heidelberg 🌾. 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 | 1 | 0 | 0 | 0 | 0 | 0 |
| Feb | 40.1 | 0 | 0 | 0 | 0 | 0 |
| Mar | 186.7 | 400.8 | 0.2 | 0 | 0 | 0 |
| Apr | 24.4 | 1750.4 | 25 | 0 | 0 | 0 |
| May | 0.5 | 70.5 | 321.1 | 0 | 0.8 | 0 |
| Jun | 0 | 0.3 | 761 | 44.2 | 0.9 | 0 |
| Jul | 0 | 0.1 | 241.2 | 304.3 | 0 | 0 |
| Aug | 0 | 0 | 51.1 | 96.1 | 0 | 31.4 |
| Sep | 0 | 0 | 4.5 | 43.2 | 0 | 41.2 |
| Oct | 0 | 0 | 0.2 | 5.2 | 0 | 0 |
| Nov | 0 | 0 | 0 | 0 | 0 | 0 |
| Dec | 0 | 0 | 0 | 0 | 0 | 0 |
(51 km)