OFF ICE IS NEVER 100% SAFE! Recommended Minimum Ice Thickness (Guidelines for New, Clear Ice Only) Aur m 4" On foot <4" Keep off 7-8" Side-by-side ATV 5-7" Snowmobile DEPARTMENT OF NATURAL RESOURCES 9-12" Car 13-17" Truck 20+" Heavy duty truck with wheelhouse shelter 2024 State of Minnesota, Department of Natural Resources. The Minnesota DNR is an equal opportunity provider. OFF ICE IS NEVER 100 % SAFE ! Recommended Minimum Ice Thickness ( Guidelines for New , Clear Ice Only ) Aur m 4 " On foot < 4 " Keep off 7-8 " Side - by - side ATV 5-7 " Snowmobile DEPARTMENT OF NATURAL RESOURCES 9-12 " Car 13-17 " Truck 20+ " Heavy duty truck with wheelhouse shelter 2024 State of Minnesota , Department of Natural Resources . The Minnesota DNR is an equal opportunity provider .