Next year we will be traveling in a fifth wheel from Portland, Oregon to Salt Lake on I84, then I15 down to St George. Beside summer, what are the safe months to travel this route? March at the earliest? November at the latest? Thanks in advance for any advice you can give.
Like others, we've driven this route perhaps 30 times, in every month of the year. Some January-March trips have been completely clear (and cold!), and I've also been in heavy snow in Eastern Oregon in October and late April.
I check the forecasts for Meacham OR, Baker City, and Snowville UT. Oregon's highway website is very good, and has cameras in all the critical spots. That's how I choose the actual day.
I will add that we stopped several times at the Wild Horse Casino. When the truckers left the truck stop down the road, we knew that the road was open and in good shape.
We have driven 84 in February about 10 times, seen snow a few times. But someone not on a schedule could easily travel even in February and avoid snow events. It's a main truck route, so cleared often and kept open all year. Just avoid traveling during or right after a winter storm. For the most part, not much to worry about.