The state keeps I-15 free of snow as long as it isn't actively snowing. I live near Provo and the past few years we typically don't have snow on the lawn during the winter. It will snow and then melt. If you watch the forecast, you should be fine. Avoid driving during expected snow fall. Here in the valleys we can go weeks without snow falling in the winter.
South of Provo, you have a couple of short passes that can get snow.... one north of Fillmore and one south of Beaver... Cove Fort area.... Scipio.
There is construction between south Salt Lake City and Provo on I-15. They are pretty far along with the construction so traffic is driving on the new cement lanes but there may be some lane shifts on each end of the construction.
