They are more rare the further south you go. That said, you could run into one just about anywhere in region g & h, but it's not likely at all. Where I was hunting this year (Hoback area), there was some black bear sign, but no grizzly sign at all. In talking with the biologist and co for the area, they both confirmed that grizzlies had been reported in the Wyoming range before, but its not something to be overly concerned with.
Aside from that, camping in grizzly country isn't something to be feared. Be smart and camp clean and you should be fine. Hang your food and meat if you can't get it out in the same day as you kill and make sure it's 10' off the ground and 4' from the nearest tree.