Devil Dog Ultras returns to Triangle, Virginia on December 5th, offering a challenging course for seasoned ultrarunners with distances ranging from the grueling 100-mile event down to the more manageable but still demanding 50K. The race unfolds in Prince William Forest Park and is organized by an enthusiastic group of trail runners known for their quirky spirit and extensive experience. On race morning, participants can expect a firm yet slightly soft trail surface underfoot as they navigate through single-track trails that wind around rolling hills with occasional steep sections marked only by roots and rocks. The weather forecast suggests temperatures will hover between 32°F to 41°F (0°C to 5°C) at the start of the race, presenting runners with a cool but not frigid environment for their endeavors. Since its inception in previous years, Devil Dog Ultras has become an iconic event within the ultrarunning community. The race attracts hundreds of participants annually who come together to push their limits on scenic trails that wind through Prince William Forest Park. Runners are drawn by more than just the challenging terrain; they also support a cause close to many hearts—the United States Marine Corps Foundation, which benefits from donations and awareness generated during this event. The course for Devil Dog Ultras primarily consists of single-track trail loops with well-marked aid stations at Camp Remi (start/finish), Camp Gunny, and Camp Toofy. Each loop covers 19.5 miles except the first one which measures 23 miles. Runners will find three fully stocked aid stations on each lap offering hot food options such as chili, oatmeal, pasta dishes, sandwiches, potatoes, burritos, fruits, vegetables, and an array of beverages including coffee and tea in addition to water and sports drinks at unmanned resupply points (RP Alpha, Bravo, Charlie). Crew access is permitted only at Camp Remi and Camp Toofy; however, the race can be completed without crew support thanks to enthusiastic volunteer assistance. Weather conditions on December 5th are expected to feature a UV index of 2.0 (low), indicating minimal sun exposure risk along with temperatures ranging from freezing cold mornings up to mild afternoons as runners progress through their respective loops. Humidity levels will likely hover around the typical winter range for northern Virginia, and there is no significant precipitation forecasted.
100-Mile Start: 06:00:00 • Fee: $295.00
100K 100K • Start: 06:00:00 • Fee: $245.00
50K 50K • Start: 07:30:00 • Fee: $130.00
To register for Devil Dog Ultras, visit the official registration page at https://ultrasignup.com/register.aspx?did=134073. Early bird pricing is available until March 1st when fees increase; final registration closes on November 27th or sooner if spots are filled before then. Bib transfer options end November 5th, and swag announcements follow the United States Marine Corps Foundation's birthday celebration on November 10th. Bib pickup for participants will take place at Prince William Forest Park (Cabin Camp 5) starting from December 4th until race day morning. Participants must bring a photo ID to collect their bibs during this period. On-site registration is also possible but only if space remains available and additional fees apply. Age requirements specify that runners need to be at least eighteen years old for the full distances; however, younger participants may compete in shorter events with parental consent. Devil Dog Ultras concludes its race day activities on December 5th after a challenging event in Triangle, Virginia, featuring one of the most rigorous ultrarunning courses known. Runners are drawn to this event not only by its demanding trails but also for their dedication to supporting local communities and charities through participation.
Races Offered
100-Mile
Dec 05, 2026
straighten
Distance —
160.9K
terrain
Type —
Running
timer
06:00
sell
$295.00
100K
Dec 05, 2026
straighten
Distance —
100K
terrain
Type —
Running
timer
06:00
sell
$245.00
50K
Dec 05, 2026
straighten
Distance —
50K
terrain
Type —
Running
timer
07:30
sell
$130.00
Weather History
These values represent the 3-year monthly averages for December in Triangle.
thermostatTemperature
0.1° / 9.0°
wb_sunnyFeels like
-4.0° / 5.2°
light_mode
Avg sunshine hours
6h 2m
water_drop
Avg rainfall
3.3 mm
ac_unit
Avg snowfall
0.1 cm
air
Avg wind speed
10.4 km/h (Light breeze)
opacity
Sweat loss rate
Low
terrain
Course conditions
Firm and slightly soft
sunny
Max UV Index
Low (2.0)
humidity_mid
Humidity
69.8%
wb_twilight
Sunrise
08:18
nightlight
Sunset
17:50
About Triangle
Learn more about the host city, Triangle.
Triangle is an unincorporated community in Prince William County in Northern Virginia.