That time of year is really iffy. You re going to want to bring a couple different options. Some years, it can be quite warm, shorts and t-shirts weather, and other times it can be snowing. Your best bet is to keep an eye on the weather channel in the weeks prior to get a better idea of what to expect while you re going to be there.
March is usually windy in Gatlinburg, so wear a short sleeve shirt and a wind breaker, that way if it gets warm, which it usually does for a few hours during the middle of the day, you can take off your jacket and not be roasting, Nights are still very cool, and frost is probable in the morning.
it can ,but it will be cold in march