frost line

noun

frost line

In regions where there is no permafrost, the maximum depth to which frost penetrates the ground in the winter.
The lower limit of permafrost.
In tropical regions, the elevation below which frost never occurs.

It should be a permanent trellis, made of cedar posts set three feet deep, so as to be below the frost line and four feet high.

Coffee is found growing in all altitudes, from sea-level up to the frost-line, which is about 6,000 feet in the tropics.

Growers tell me that Snyder blackberries are killed down to the frost line, which proves it is not iron-clad, as some believe.

The cost of installation will depend largely on how deep it is necessary to go to get below the frost line.

The crevices where racers hibernate are known to be several feet deep in some instances, extending well below the frost line.

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