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 Falls 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.
Last edited by troutman; 07-08-2014 at 02:29 PM.
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