The lack of snow can also help ice get thicker faster, because when snow accumulates on ice it insulates the ice. Meyer said he took up ice fishing three years ago. Meyer said Wednesday was the “most beautiful day” he’s experienced while ice fishing, with sunshine, mild temperatures and no wind. According to Minnesota’s Department of Natural Resources, 4 inches of clear ice (as opposed to slushy ice) is the minimum needed for safe ice fishing. Holes for ice fishing should be no more than 10 inches in diameter.