Dictionary.com
Thesaurus.com

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.


Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The refuges must be deep enough to extend below the frost line, while also being sheltered from wind, rain and dripping snowmelt.

From Seattle Times • Jun. 6, 2017

About 300 homes are without water and the number is growing as the frost line penetrates deeper in the ground, he said.

From Reuters • Feb. 25, 2015

What is the frost line, and what does it help to explain?5.

From Textbooks • Jan. 1, 2015

For instance, if you live in a cold climate, you might find that the pier is required to extend below the frost line of the house so that a frost heave doesn't occur.

From US News • Jun. 30, 2014

Miyax dug to the frost line, then whacked at the ice until, many hours later, she had chopped three feet into it.

From "Julie of the Wolves" by Jean Craighead George