Trail running is extreme, and trail running in Sylva is no exception. How does running a seven-mile mountain trail race with 2,770 feet of elevation gain sound? Trail runners who compete in the Assault on BlackRock trail race will summit BlackRock at 5,810 feet - and that’s just the halfway point of the race. The trail race weaves through the spruce forests along the spine of the Plott Balsam Mountains on challenging gravel and dirt roads. The final summit comprises a 650 feet gain in 1/3 mile on the steep single track.