"Grit, endurance, temporary loss of sanity. You might need all of these if you want to attempt Grindstone. If you want to finish, well, just keep in mind this is, without a doubt, the hardest 100 miler east of the 100th meridian."
The Grindstone 100 boasts an elevation profile of something you might see out west, with 23,200 feet of gain & 23,200 feet of descending! The race has a unique start time of 6:00 pm which leads to the goal of not seeing the second night. The race travels out and back on trails through the George Washington National Forest in Virginia, with the start/finish at Camp Shenandoah.