Eight of the bison have been corralled, but ten are still on the loose.
Sheriff deputies received a call around 8 a.m. Saturday morning about the bison, reported WDJT.
The bison escaped their enclosure after a tree fell on part of the fence.
Some roads in the area have been blocked off as deputies and others try to catch the remaining ones.
Some of the bison have been spotted in the area of Highway K and Highway EW.
TMJ4 noted that anyone who spots any of the loose bison should call 262-653-6600.