Will it freeze tonight where you are?
Overnight frost risk for gardens and fields from the forecast for your selected location. We show risk categories and available nights in the next 48 hours, not garden measurements.
Choose another location →Choose a location for planning. Forecast values load when the data service is available.
We forecast temperature at 2 m. Ground-level temperature is unavailable. Ground frost is a risk estimate from temperature at 2 m, cloud cover and wind.
Nights in the next 48 hours
We assess only the available hourly forecast. An incomplete night or missing inputs means “unknown”.
Spraying
The product label, crop condition, spray drift and bee protection determine whether to apply. The weather filter does not assess these.
Spray conditions by hour
✓ Weather meets the indicative filter · ~ Cold for the general filter — check the product’s temperature requirements · × Filter not met · ? Cannot assess
Rainfall and irrigation
Daily forecast totals. Today covers only the remaining part of the day. These are not field measurements or recommended irrigation amounts.
Wind and fieldwork
Mean speed and gusts for planning spraying, fertilisation and fieldwork. Gusts can be much stronger than the mean.
| Time | Mean | Gusts | Temperature °C |
|---|
What is ground frost?
Ground frost occurs when air close to the ground falls below freezing during the night or morning. CHMI measures the ground-level minimum at 5 cm above the ground.
Definition source: CHMI — Meteorological terminology
How to read the risk categories
These are internal indicative Fakt počasí thresholds, version 2. They are not CHMI thresholds or a verified probability of frost or plant damage.
| Category | Condition |
|---|---|
| Frost at 2 m | Nightly minimum at 2 m ≤ 0 °C. |
| Ground frost possible | Minimum at 2 m > 0 to ≤ 3 °C; at the coldest hour cloud cover ≤ 30 % and wind < 7.2 km/h (2 m/s). |
| No frost signal in the model | A complete night with the required inputs known that does not meet the preceding rules. This does not rule out local ground frost. |
| Unknown | The night is not fully covered or required data is missing. A missing temperature does not mean zero. |
Threshold source: indicative Fakt počasí service rules, version 2. The server calculates categories; dew point is not used in frost assessment.
The category does not describe how a particular plant tolerates frost.
How do we know?
This is a deterministic forecast from the Fakt počasí API for the selected point, not a measurement in your field. Inversion is only estimated from clear skies and light wind, not a measured temperature profile.
Terrain and crops can change local conditions. Historical rainfall, evaporation and water balance are unavailable in this forecast.