Try Our Apps


Avoid these words. Seriously.


[frawst-lahyn, frost-] /ˈfrɔstˌlaɪn, ˈfrɒst-/
the maximum depth at which soil is frozen.
the lower limit of permafrost.
Compare permafrost table.
Origin of frostline
An Americanism dating back to 1860-65; frost + line1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
Cite This Source
Examples from the Web for frost line
Historical Examples
  • This is done to get the invalid below the frost line as quickly as possible.

    The houseboat book William F. Waugh
  • Below the frost line the slopes were dark or covered with yellow barley and wheat stubble or green alfalfa.

  • Thus in a half hour we passed the frontier between the agricultural folk below the frost line and the shepherd folk above it.

  • 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.

    A Woman's Hardy Garden

    Helena Rutherfurd Ely
  • Then the pipe throughout its entire length must be in a trench below the frost line at the entrance to the spring as elsewhere.

    Rural Hygiene Henry N. Ogden
  • It should never be so high that it will come above the frost line which is two and a half feet in depth.

    Garden Ornaments Mary H. Northend
  • The march of civilization has actually pushed back the frost line some distance.

    Reading the Weather

    Thomas Morris Longstreth
  • Earthworms live underground in burrows that are sunk well below the frost line.

  • Gasoline is admitted through pipes below the frost line from two 50-gallon tanks underground, 30 feet from building.

    Farm Boys and Girls

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

British Dictionary definitions for frost line

frost line

the deepest point in the ground to which frost will penetrate
the limit towards the equator beyond which frosts do not occur
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Cite This Source
frost line in Science
frost line  
  1. In regions where there is no permafrost, the maximum depth to which frost penetrates the ground in the winter.

  2. The lower limit of permafrost.

  3. In tropical regions, the elevation below which frost never occurs.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source

Word of the Day

Nearby words for frost line

Word Value for frost

Scrabble Words With Friends