Blood Rock 100

Pelham, United States • 5 Dec 2025

Event overview

Blood Rock takes place December 5-7, 2025 at Oak Mountain State Park, Meeting Center at the Cabins on Tranquility Lake in Pelham, AL. The weekend features four events:

  • 101.79 miles
  • 51.19 miles
  • 31.18 miles
  • 16.62 miles

Registration closes December 1 at midnight CT. There is no on-site registration at the start. Shirt order deadlines are October 20 and November 16; the final shirt order is placed November 17. Students (high school age or under) may register with a 50% discount using a discount code at checkout. Refunds are available through UltraSignup up to 30 days before registration closes; after that entrants may roll entries to the next year or receive race credit. If the race is cancelled for reasons beyond the organizer's control, full refunds are offered up to 30 days prior; after that entries roll over.

Courses and support

The Blood Rock 100 is two full laps of the new Blood Rock course; the Blood Rock 50 is one full lap. The 50K follows one full lap of the North Loop including the Belcher Tract. The 25K passes Summit Lake and Demopolis Lake, then splits back toward the finish near King's Chair.

Course details for the 100: elevation gain 17,196 ft, single-track 92.84 miles, gravel 7.74 miles (cars not allowed), paved 1.18 miles. The 50-mile course lists 8,659 ft gain and 46.42 miles of single track. Aid stations are placed approximately every 5-7 miles and provide hot soup, hot food overnight, cold drinks (bring your own cup), and breakfast in the early hours. Packet pickup, drop-bag options, and race briefings are scheduled on the days before each race; the course closes Sunday morning. Visit the organization's website for the most recent information.

Race information

102 mi
17196 m+
Blood Rock 100
51 mi
8659 m+
Blood Rock 50 Mile
31 mi
5345 m+
Blood Rock 50k
17 mi
2885 m+
Blood Rock 25k
Visit the organization's website for the most recent information.
Trail runs nearby

The Alabama RX at Brookside will take place in Graysville on Sunday 12 October 2025. You can run between 3 and 3 miles.

Event Yo Amo Amarillo is an endurance trail event held on Sunday, October 19, 2025. The event uses Oak Mountain’s Yellow Trail and is organized as an 8-hour format where participants complete repeated out-and-back laps within an eight-hour..

Take on a lighted 1.00203 mile loop at Veterans Park in Alabaster with options from marathon and 50K to timed 6 12 24 48 and 72 hour events. Solo or team entries, around the clock aid and real food, plus 100 and 200 mile buckles for the bol..

Experience Halloween Havoc at Oak Mountain State Park in Pelham, Alabama: a spooky night trail with hilly single track and 13 miler or 6 miler loop options. Wear a headlamp, compete in costume, and celebrate with pizza, music, and a custom..

Event overview Sloss Rx is a Halloween-themed race held at the Sloss Historic Furnaces in Birmingham. The course is described as fast and flat with wide, open sections and sweeping turns. A singletrack detour through the "Fright Furnac..

Carry a 20 lb kettlebell each mile in this 50K elimination challenge at Oak Mountain State Park where laps whittle the field until finishers remain. Tough, scenic and rewarding with custom shirts and finisher prizes.