Warszawa, Poland · 52.23°
When to plant blackberries in Warszawa
The Warszawa dates are calculated from the observed last spring frost — a 2016–2025 mean of 15 April — rather than from a latitude estimate or a national calendar. The frost-free season here averages 211 days.
Season anchorobserved 2016–2025
Last spring frost: 15 April · latest 11 May
First autumn frost: 12 November · earliest 21 Oct
Frost-free season: 211 days · 10 complete years
These come from the ERA5 reanalysis on a roughly 9 km grid, so they describe the area rather than your plot. A hollow, a frost pocket or an exposed site regularly runs several degrees colder, so use the cautious date for a decision you cannot undo.
Frost date estimator →Local calendar windows
The cautious column is calculated from the latest frost recorded in the period (11 May). Use it for tender crops you cannot re-sow.
The year in Warszawa
What can move the date
It fruits on last year’s canes, so tie the new growth to one side of the wires and the fruiting canes to the other — that way you can cut the spent ones out without untangling anything. Thornless varieties are worth the small loss of flavour.
Final spacing: 200 × 250 cm. Soil: pH 5.5–7.
Problems in Warszawa
Each has its locally favourable conditions counted month by month, from the weather archive for this city.
Full guide: blackberries diseases and pests →