^^^^This^^^
Frost has been out for weeks! I would investigate a breakage, especially if you know exactly how far up the pipe you are.
If the area had good snow cover, the frost was likely never really that deep to begin with. I was able to dig a 5 foot deep hole in my yard the second weekend in January (I did not do this for fun, in case anyone is curious) frost was about 3" deep under 2 or so feet of snow.
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