Quote:
Originally Posted by troutman
Calgary to Idaho Falls could be real dicey in December. You have to go over a high pass between Butte MT and Idaho. Day 1 is a really long drive, in good conditions (1100 km). Idaho Falls to Reno is another 1000 km.
Idaho Halls to Reno/Tahoe to San Fran is more direct. Las Vegas is quite a bit further South. Could encounter bad conditions again crossing from Nevada to Cali.
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Monida pass right on the border of Idaho and Montana on the I15. As troutman said, it can get real dicey. I did the trip before Christmas a few years ago and I can't say I would want to go through that pass again in the winter. Further south in Utah there are some high passes as well, I think the State Troopers can require you to have chains to even let you try it.
Going to Reno/San Francisco would go through Donner Pass. There is a National Geographic show Hell on the Highway about it. It seems like it can get pretty nasty in the winter as well.
Finally, if you can, go from North to south on the 101/PCH and hope it isn't foggy! It might be less sketchy getting to Seattle in the winter than going south.