In all likehood I'd say no, but you never know about how an animal will travel. Several years ago a cougar tagged as a kitten down south of Custer State Park in SD was killed over in the southern BigHorns, which is over 200 miles as the crow flies. I can tell you there is occasionally a wolf or three that gets over into the Bighorns. Several years ago a pack of 8 killed 40+ sheep on the ranch next to where I hunt and it was kept very quiet. The Father of the Government hunter that came in and killed three of them by plane told me the alha male his son killed had a collar on showing he was from up above Yellowstone near Gardner, MT. That again is hundreds of miles from collaring to where he ended up. So yes it's possible on the grizzly question, but pretty unlikely.