Frost Depth

Links to some additional information about frost depth and soil temperatures:

• Link to ArcGIS Online app for Frost Depth
• NCDC Winter Severity and Frost Depth in a Warming Climate About AFI - Air Freezing Index
• Illinois State Water Survey - Water and Atmospheric Resources Monitoring Program (WARM)-  IllinoisSoil Data
• Iowa State Soil Moisture Network Iowa Average 4 inch Soil Temperature - Reports and Interpolated County Average
• North Dakota USGS Soil Moisture / Temperature Sites 
• North Dakota Agricultural Weather Network Soil Temperatures