In Quartzsite, thinking of Montanna.. don’t like mountains..

I15 goes north to Montana, without crossing anything significant. Well, there's a broad pass on the ID/Mt border. And the I90 crossing at Butte is relatively high. But what do you expect from a state that's called Mountain?

Define flat. Lot's of mountains out West. Part of the beauty.

Sierras aren't the rockies but they are more anything back East. If you are crossing on I-10, it probably isn't too bad but it's all relative. Crossing at Lake Tahoe to cut back to Montana has decent climbs. Not sure about going further north before cutting back East.

U.S. Hwy. 395 is not flat but the grades are not that steep.

What’s your issue with hill climbing?