25" from the furthest outward spot on the bumper, to the ground.
Bumper height laws in Minnesota, only apply to Passenger vehicles, ie daily drivers. I have collector plates on my Land Cruiser, which designates it as a special use vehicel, similar to street rods. I have not been harrassed by the law while driving this truck on the roads in Minnesota. In the nicer months, I do drive it back and forth to work in Bloomington, from Farmington, a few times a month.
I once had printed a copy of the state statute concerning this, I will try to find it.
-Steve