TJB:
You should be fine heading to Montana. I go to Missoula every 4 months or so and as long as you adhere to the major arteries/roads, I don't forsee any issues. The State Authority does a great job of keeping the roads clear up there; perhaps because there aren't many other jobs to be had - J/K. [img]/infopop/emoticons/icon_biggrin.gif[/img]
I travel back and forth from the Bay Area to Tahoe on Highway 80 all the time. The CHP had a chain check enforced this weekend during the storm and they took one look at my tires and waved me through.
If you have M + S tires, you should be OK without chains. I cannot speak for Idaho's enforcement [en route to Montana], as I have always crossed-through that State at times when the road is entirely clear.
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