Might not be completely out but all the standing melt water disappeared the last 3 days. Good enough for me
Noon news a week ago said there was only about a 15" frost line to start with. Somebody yanking our chain.
Frost depth has a fair number of variables. How bare is the ground? Has it been tilled? How wet or dry is the soil compared to normal? Have you had deep snow cover, or has it been near nothing this winter? When your area gets to 20+ degrees, is it sunny or cloudy? Is the referenced site in any way, shape, or form different than your exact location?
There are more and more soil temperature profiles available every year. Back when I started to get interested in this topic there wasn't 1/20th what is currently available. Take a gander at NDAWN's Soil Temp data.
I always try to describe a given area's frost depth as a reasonable range.