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frost line

British  

noun

  1. the deepest point in the ground to which frost will penetrate

  2. 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
frost line Scientific  

  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.

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.