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Well, there more then one frost line in Illinois: 1) 10" to 20" for Southern Illinois

2) 15" to 30" for Central Illinois (frost line for Peoria)

3) 20" to 35" for Northern Illinois

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12y ago
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9y ago

The frost line in Chicago depends on the average temperature in winter over a period of time. The winter of 2013 - 2014 was especially cold and the frost line reached a depth of 15 feet in some areas of Chicago. The average frost line in Chicago is about 7 feet per winter.

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9y ago

The frost line refers to how deeply frost is able to penetrate into the ground. In Colorado, the frost line is around 14 inches into the soil.

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14y ago

Your local building council should have that. You can call them and ask how deep does the footings have to be - which will actually be below the frost line.

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9y ago

The frost line in Wisconsin is different in different parts of the state. In northern Wisconsin, the frost line is 40 inches. In southern Wisconsin the frost line is 48 inches.

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11y ago

From 50 - 90 inches depending on how far north you are

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15y ago

42 inches

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Q: How deep is frost line in Wisconsin?
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