Location: 42.53.250N 088.12.703W el. 764ft (give or take)
Mileage: zero miles
Primary Sled: 1996 Yamaha V-Max 600 DX
Where I sled: WI
Unfortunately, no. Insurance is not mandatory for snowmobiles in WI. It is advised to carry it though, as with anything else, you are personally liable for damage caused (which as we all know can be quite costly). I would suggest carrying at least liability and medical which is fairly cheap.
Just my $0.02.
"Life should NOT be a journey to the grave
with the intention of arriving safely
in an attractive and well-preserved body,
but rather to skid in sideways,
chocolate in one hand,
martini in the other,
body thoroughly used up,
totally worn out and screaming...
I wouldn't ride without it regardless of the law , My cousin got hit by a guy crossing a lake across the trail and was sued . The guy was a sue happy person and it took two years to settle the matter even with insurance . The guy that hit him got cash from the helmet mfg co. because he didn't see a warning to remove the protective plastic film from the visor and a settlement from my cousins insurance to make it go away. Imagine getting your pockets picked clean by slime like that if you didn't have insurance .