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oldmanski@eheath is correct. West Yellowstone all the way to Ashton on hwy 20 should be the worst of the worst. I have seen I-15 get pretty bad all the way from Idaho Falls to SLC but that is quite rare. Just watch the weather and ride it out if needed. Malad pass can get a little sketchy(one of the last southern towns in Idaho) before Tremonton, UT. If you have any troubles, hit me up. I got some connects throughout the area.
eheathI must have had pretty good luck on 15, slc to idaho falls is always fine, even if its snowing I've had zero issues. As soon as you hit the mnts in ID it can get super sketch, I've had some really snowy drives through yellowstone and big sky to bozeman and if you're a good snow driver its not bad at all, just takes a lil longer.
chris.goodhueI've had some seriously gnarly drives from SLC to MT, unless it's sunny I'd probably avoid the Madison Valley route...
eheathI know alot of people who will go the madison river route when it snows, definitely less elevation gain/loss, but i usually just send it over big sky, its never closed and its never that bad.
chris.goodhueI've experienced the most intense wind / driving snow / zero visibility twice while driving at night through the Madison Valley...so bad we had to stop, wind was so strong almost couldn't open our door haha. The Madison Valley is so wide winds can just get going....but your right, less up / down.