100-mile and 100K trail races

Dec. 17-18, 2016

Prince William Forest Park, Triangle, VA

Click here to register via UltraSignup.

Registration

Find out everything you need to know about when registration opens, what you need to do to confirm your eligibility to enter, and more.

Race Info

If you're dying to know all the nitty-gritty about the race itself — the course, the elevation gain, the location of aid stations — it's all right here.

Crew & Pacers

So you're going to spend the night tending to a grumpy runner who turns into a colicky toddler at 3 a.m.? This is where you find out what you need to know.