Pollen Counts in Norway
Check daily pollen forecasts, the pollen map, seasonal trends, and all the cities we cover in Norway. Forecasts update every day, so check back regularly during pollen season.
Updated: 8 Oct 2026.
Norway Pollen Map
- Alder
- Birch
- Grass
- Mugwort
- Olive
- Ragweed
Norway's Pollen Seasons
In Norway, pollen from trees starts with alder in March, and it can continue through April and May. Birch pollen follows in April, remains common in May, and may last into June in many recorded seasons.
Grass pollen season usually arrives in June and continues through July. These flowering plants grow in many places and release tiny grains into the air. For people with allergies, grass pollen can make these summer months uncomfortable.
Weeds also have pollen seasons: mugwort can appear in July and August, while ragweed is recorded in September. Olive pollen is recorded in June. These plants add several later or less familiar parts to Norway’s pollen calendar.
Birch pollen is the most common type across the year in these records, and April is the busiest month for pollen overall. The dates are averages from 28 cities, so local seasons may differ from place to place.
Pollen Calendar for Norway
Typical pollen calendar for Norway, averaged across 37 cities from previous years. Alder peaks in March, Birch peaks in May, Grass peaks in June, Mugwort peaks in August. Use it to see which months each pollen type usually rises and falls.
| Alder | Birch | Grass | Mugwort | Olive | Ragweed | |
|---|---|---|---|---|---|---|
| Jan | 0 | 0 | 0 | 0 | 0 | 0 |
| Feb | 0 | 0 | 0 | 0 | 0 | 0 |
| Mar | 11.1 | 34.7 | 0 | 0 | 0 | 0 |
| Apr | 6.3 | 1181.1 | 0.1 | 0 | 0 | 0 |
| May | 4.1 | 1375.5 | 8.6 | 0 | 0 | 0 |
| Jun | 0.2 | 418.1 | 225.2 | 0 | 0 | 0 |
| Jul | 0 | 21 | 200.5 | 12.2 | 0 | 0 |
| Aug | 0 | 0 | 14 | 14.7 | 0 | 0.2 |
| Sep | 0 | 0 | 0.6 | 0.1 | 0 | 4.9 |
| Oct | 0 | 0 | 0 | 0 | 0 | 0 |
| Nov | 0 | 0 | 0 | 0 | 0 | 0 |
| Dec | 0 | 0 | 0 | 0 | 0 | 0 |
Values in gr/m³ (pollen grains per cubic metre), averaged across covered cities. Local microclimates vary. Not medical advice.
Places We Cover in Norway
We publish forecasts for these cities across Norway. Check the list to see what is near you, or view them on the Norway Pollen Map above.
Agder
Akershus
Buskerud
Finnmark
Innlandet
Møre og Romsdal
Oslo
Oslo County
Other
Rogaland
Troms
Trøndelag
Vestfold og Telemark
Vestland
Østfold
Pollen information is for education and planning only. This is not medical advice. Consult a qualified healthcare provider about symptoms or treatment.