If your down around Gatlinberg it gets warm around march to April 15 but when you hit the smokey mtns it will drop around 10 - 15 deg on top. We got trees blooming here around late march.
I've been down at Deals Gap in my cage the past 2 years, last part of April/first part of May. In 2010, it was rainy the first day we got there. This past April a tornado came through. DOT had the roads cleared off pretty quickly though.
I'll be in Deals Gap on April 23-24, then looping north through the Shenandoah Valley before heading east to catch the last few days of the Outer Banks Bike Week.
Check this site follow the links you will find more information than you ever need.
If you chose to print the PDF maps use Internet explorer for some reason the will not print in fire fox.
Detailed maps of all the runs in that area. http://tailofthedragon.com/dragon.html
I wouldn't advise going April 13th -18th.. there's gonna be a huge car meet there for S2000's. We usually do it twice a year in April and August or September. We usually are very respectful to everyone that's why we keep getting invited back to Fontana Village.