Pollen Counts in Croatia
Check daily pollen forecasts, the pollen map, seasonal trends, and all the cities we cover in Croatia. Forecasts update every day, so check back regularly during pollen season.
Updated: 25 Oct 2026.
Croatia Pollen Map
- Alder
- Birch
- Grass
- Mugwort
- Olive
- Ragweed
Croatia's Pollen Seasons
In Croatia, tree pollen appears in spring. Alder and birch pollen are measured in March and April. Olive trees release pollen in May and June. Olive pollen is the most common type across the year.
Grass pollen season in Croatia runs through May, June, and July. June is the busiest month for pollen overall. This can make late spring and early summer a challenging time for people with pollen allergies.
Mugwort and ragweed are weeds that release pollen in August and September in Croatia. Their season comes later than the main tree and grass seasons. They contribute to the late-summer pollen mix.
Pollen Calendar for Croatia
Typical pollen calendar for Croatia, averaged across 71 cities from previous years. Alder peaks in February, Birch peaks in March, Grass peaks in June, Mugwort peaks in August, Olive peaks in May, Ragweed peaks in August. Use it to see which months each pollen type usually rises and falls.
| Alder | Birch | Grass | Mugwort | Olive | Ragweed | |
|---|---|---|---|---|---|---|
| Jan | 25.3 | 0 | 0 | 0 | 0 | 0 |
| Feb | 73.6 | 0 | 0.9 | 0 | 0 | 0 |
| Mar | 31.4 | 471.1 | 8.2 | 0 | 0.1 | 0 |
| Apr | 9.9 | 444.7 | 55.1 | 0 | 105.9 | 0 |
| May | 0.5 | 26.3 | 256.9 | 0 | 496.8 | 0 |
| Jun | 0.1 | 6.1 | 410.2 | 0 | 277.7 | 0 |
| Jul | 0 | 0.1 | 193.9 | 5.9 | 0.8 | 7.6 |
| Aug | 0 | 0 | 72.5 | 15 | 0 | 629.2 |
| Sep | 0 | 0 | 14.5 | 6.1 | 0 | 409.6 |
| Oct | 0 | 0 | 2.7 | 0.4 | 0 | 0.5 |
| Nov | 0 | 0 | 0.4 | 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 Croatia
We publish forecasts for these cities across Croatia. Check the list to see what is near you, or view them on the Croatia Pollen Map above.
County of Osijek-Baranja
Dubrovačko-Neretvanska Županija
Dubrovnik-Neretva
Istria
Istria County
Karlovac
Krapina-Zagorje
Lika-Senj
Lika-Senj County
Međimurje County
Osječko-Baranjska Županija
Other
Požega-Slavonia
Primorje-Gorski Kotar
Primorje-Gorski Kotar County
Sisak-Moslavina
Split-Dalmatia
Split-Dalmatia County
Varaždin County
Virovitica-Podravina
Vukovar-Srijem
Zadar
Zagreb County
Šibenik-Knin
Šibenik-Knin County
Pollen information is for education and planning only. This is not medical advice. Consult a qualified healthcare provider about symptoms or treatment.