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Frostline in Utah (not specifically for Box Elder County) is 30 inches deep. I assume that this is a typical statewide rule of thumb good for most locations but would not apply to very high elevations.
12 inches
Wilmington, North Carolina, is located in New Hanover County. The frost line depth in New Hanover County is 2 inches.
36 inches
The frost line in Wilmington, North Carolina is 2 inches. This is the same for all of New Hanover county.
24"
According to the building permit section of the Clermont County, Ohio web site "The frost line is 30 inches below grade." See attached link
no Frost
The frost line in Salt lake city is 30 in. I would assume that that is average for most of the state.
According to the Idaho Association of Building Officials, the frost line in Idaho ranges from as little as 12 inches in Orofino County to as much as 36 inches in several counties. Ada County, where Boise is located, has a frost depth of 24 inches. See the full list here: http://www.idabo.org/loads.htm
From Council Bluffs, Iowa. to Oakland, California.meeting in the middle at Promontory Summit, Utah Territory for a total distance of .1907 miles.It was built between 1863 and 1869.May 10, 1869 the Union and Central Pacific Railroads joined their rails at Promontory Summit, Utah Territory.
frost line in Gwinnett