re: Laramie, Wyoming to Yellowstone NP

The best way I can think of to get there would be to take 80 west to Rock Springs and then up US 191 to Jackson, and then you could go to Grand Teton and Yellowstone. Just be careful, even in late may the mountains can get a lot of snow (Yellowstone area got 3 feet of snow the weekend before Memorial Day weekend when we were there in 2007). Like PNW said, you are talking 800+ miles and close to 9 hours drive one way.

Rocky Mountain is only about 120 miles and less than 3 hours south of Laramie. Also, if the road is open, take Wyoming 130 west out of Laramie to Centennial and then keep going up into the Medicine Bows at Snowy Range pass. beautiful area up there, but again accessibility all depends on the weather and how much late season snow they get.