Sinclue,

The ride over Beartooth Mountain, from Yellowstone into Red Lodge, Montana is most certainly memorable.  I don't know if the mountain pass will be open, it depends upon the weather, but I know they try to have it open by the end of May.  Charles Kuralt called it, "the most beautiful drive in the world."  The Yodeler Motel web-site calls Beartooth Pass: "The National Scenic Byway US-212 is a spectacular 67 miles from Red Lodge to Cooke City. The 2-3 hour drive with stops will take you to the "Top of the World" at nearly 11,000 ft.  This adventure takes you through alpine plateaus and lakes with views of snowcapped mountains, glaciers and meadows of incredible beauty. Not only can you play in the snow fields, but the area abounds with wildlife and acres of wild flowers in mid July.

The extra time spent here will be the most unforgettable exp erience of your vacation!"

I wouldn't miss it, if I were to visit Yellowstone again.  I was fortunate enuf' not to tow the TrailManor the first time we took this pass and if we were to take the ride again, I wouldn't take the TM along.  Just leave it parked and enjoy the view.  If you're anything like me, you'll be white-knuckled enuf, without wondering if the trailer will get you to the bottom faster than you want to go.  The northeast pass was not open when we were in Yellowstone (Thank God). We exited Yellowstone using the Northwest exit and made our way to Red Lodge, MT.  When we arrived at the Red Lodge KOA, we were told the highway would open the following day.  We made the journey without the TM.  It was great.

Happy Trails.............George