Ground frost occurs when the temperature close to the ground (measured 5 cm above the natural ground level) falls to the freezing point or below. This can have certain damaging effects on agriculture and forestry.
Ground frost warnings are only issued during certain times of the year from 15 March to 31. October and for low-lying areas (below 600 m):
Ground frost also occurs in the winter, but since this is not unusual for the season, no warnings are issued during the winter period.