Pollen Count in Riga
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Riga, Latvia has four distinct pollen seasons.
Updated: 2/9/2026
The first season starts in late March or early April with alder pollen. This pollen comes from alder trees that bloom during this time.
The second season begins in late April or early May with birch pollen. Birch pollen is one of the most allergenic pollen types. It causes strong reactions in people with allergies.
The third season starts in late May or early June with grass pollen. This pollen season is usually the longest, lasting around 2-3 weeks. The fourth and final season begins in late July or early August with ragweed pollen.
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 Riga 🌾. 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 | 1.9 | 0 | 0 | 0 | 0 | 0 |
| Feb | 13.1 | 0 | 0 | 0 | 0 | 0 |
| Mar | 139.8 | 70.3 | 0 | 0 | 0 | 0 |
| Apr | 10.1 | 7238.5 | 1.1 | 0 | 0 | 0 |
| May | 1.3 | 1608.5 | 27.2 | 0 | 0 | 0 |
| Jun | 0 | 20.3 | 211.6 | 0.2 | 0 | 0 |
| Jul | 0 | 1.2 | 156 | 323.1 | 0 | 0 |
| Aug | 0 | 0 | 28.1 | 350.2 | 0 | 16 |
| Sep | 0 | 0 | 3.3 | 3 | 0 | 75.2 |
| Oct | 0 | 0 | 0.1 | 0 | 0 | 0 |
| Nov | 0 | 0 | 0 | 0 | 0 | 0 |
| Dec | 0 | 0 | 0 | 0 | 0 | 0 |
(20 km)