Big Sky Marketing Director Dax Schieffer says the resort tried to find an environmentally friendly paintball. But it turned out that the one selected contains a vegetable oil that can attract grizzly and black bears that commonly roam the region.
A wildlife official says that some bears were even eating unexploded paintballs.
The resort is on the side of a ski hill, and opened earlier this summer. It shut down in mid-July after the bear problem arose.
Schieffer says workers are now trying to find a paintball that won't attract bears.