It's just too early to go hitting the parks. Might be warmer near the lake, but I'm betting you got at least two inches of solid ground to cut through.
Those plugs stay open until the ground completely thaws so they can become liabilities to all of us.
I'm just a believer in making sure we don't dig graves for our hobby along with the sparse coinage, so I wait until I know I have ground that will cut and replace easily.
It would be a real shame to draw busybody attention to md'ing this way, especially if you don't take anything more than a few cents and some canslaw home.
This morning I was walking on top of snow as deep as 7 inches and it was solid, the ground under the ice and snow was solid, the ground that was bare was solid also. There was plenty of soft diggable ground, under the creeks however.