凍線

凍線（frost line、frost depth 或 freezing depth）是指冬季時凍結之表層土壤與未凍結之下層土壤間的分界線。

不同地點的凍線例子

^ Columbus Building Codes. library.municode.com. [2018-03-13]. （原始内容存档于2018-03-14）（英语）.
^ ^2.0 ^2.1 Frost Depth: Minnesota State Building Code Rules 1303.1600 (PDF) 2007. Minnesota Department of Labor and Industry. 2007-03-09 [2010-01-04]. （原始内容存档 (PDF)于2011-07-18）.
^ ^3.0 ^3.1 The 2007 Minnesota State Building Code (PDF). Minnesota Department of Labor and Industry. 2007-10-09 [2010-01-04]. （原始内容 (PDF)存档于2010-05-27）.
^ ^4.0 ^4.1 Foundation, Frost Penetration Depths for Southern Ontario (OPSD 3090.101 rev.1) (PDF). Ontario Ministry of Transportation. Nov 2010 [16 January 2014]. （原始内容存档 (PDF)于2019-01-15）.
^ ^5.0 ^5.1 Frost Heave (Civil Engineering vol.1 No.11). Walters Forensic Engineering. [16 January 2014]. （原始内容存档于2019-01-15）.