It’s only frost
Frost depth is important for agriculture and hydrologic forecasting in the spring, but otherwise it's not much of a concern unless it's on your windshield in the morning.
The National Weather Service has deployed a scattering of frost tubes in the upper midwest. These tubes are about five feet in depth, filled with colored water and placed down a bored hole in the soil. Observers pull the tube out of the ground and report the frost depth.
Other reports of frost depth often come from grave diggers.
Frost leaves the soil in the spring from both the top and the bottom.
CE
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