Frost line depth by state

Estimated frost depth ranges in typical soil for every state.

State	Frost depth range	Counties
Alabama	5–15″	67
Alaska	23–89″	33
Arizona	0–25″	15
Arkansas	8–21″	75
California	0–29″	58
Colorado	21–57″	64
Connecticut	27–34″	8
Delaware	19–23″	3
District of Columbia	19″	1
Florida	0–6″	67
Georgia	3–16″	160
Hawaii	0″	5
Idaho	26–48″	44
Illinois	22–44″	102
Indiana	25–39″	93
Iowa	36–50″	99
Kansas	21–34″	105
Kentucky	21–30″	120
Louisiana	3–9″	64
Maine	35–49″	16
Maryland	15–34″	24
Massachusetts	20–38″	14
Michigan	35–53″	83
Minnesota	46–65″	87
Mississippi	4–15″	82
Missouri	20–38″	115
Montana	35–59″	56
Nebraska	31–44″	94
Nevada	6–36″	17
New Hampshire	33–53″	10
New Jersey	19–34″	21
New Mexico	9–41″	33
New York	22–46″	62
North Carolina	7–25″	100
North Dakota	53–65″	54
Ohio	26–39″	88
Oklahoma	10–23″	77
Oregon	5–35″	37
Pennsylvania	21–39″	68
Rhode Island	26–31″	5
South Carolina	5–11″	46
South Dakota	39–57″	66
Tennessee	13–24″	95
Texas	2–22″	255
Utah	12–52″	29
Vermont	38–49″	14
Virginia	11–32″	131
Washington	10–39″	39
West Virginia	25–35″	56
Wisconsin	40–55″	72
Wyoming	32–54″	23