Places
Frost dates in Czechia
2 places in Czechia, each with a last and first frost worked out from its own daily temperature record rather than from a regional average. Median dates are listed below; follow a town for the full distribution, the early and late years behind it, and a planting calendar built from them.
Earliest last frost
18 Apr
At Brno, the first place here safe to plant out.
Latest last frost
22 Apr
At Prague. Spring arrives 4 days later there than at Brno.
Growing season
180–189 d
Frost-free days: shortest at Prague, longest at Brno.
Hardiness zone
7a
USDA-equivalent, the same across every place listed here.
Why frost dates vary across Czechia
A national figure would be no use to anyone here. The growing season runs from 180 frost-free days at Prague to 189 at Brno — a difference of 9 days, which is the difference between one tomato crop and none. That is why every date on this site is calculated for one place at a time.
How to read the table
Last frost is the median date of the final spring frost: in half of the years on record the last frost fell before it, in half after. First frost is the median date of the first autumn frost, and season is the number of frost-free days between them. All three are measured at the 0 °C air-temperature threshold.
A median is a planning date, not a guarantee. Plant tender crops on it and you accept roughly a one-in-two chance of a later frost in any given year. Each town page shows the cautious date — safe in nine years out of ten — alongside it, together with the earliest and latest frost the record holds. Read how the figures are calculated.
Every place in Czechia
Listed by population, because that is how most people find their own town.
| Place | Region | Last frost | First frost | Season | Zone |
|---|---|---|---|---|---|
| Prague | Prague | 22 Apr | 18 Oct | 180 d | 7a |
| Brno | South Moravian | 18 Apr | 24 Oct | 189 d | 7a |
All countries → Browse all crops → How the dates are calculated →