Javelina Jundred is a 100 mile (160 km) ultramarathon held at McDowell Mountain Regional Park in Fountain Hills, Arizona.

The course is relatively flat and fast for a trail ultramarathon, with 7,900 feet (2,400 m) of cumulative vertical gain for the hundred-mile distance.

Held in late October around Halloween weekend, the race has a unique culture with many runners wearing costumes, and unconventional awards such as best costume and best ass.

[3] Despite the festive atmosphere, the race has recently attracted a competitive field of elite runners, due to the fast course and the fact that it is a qualifier for the Western States Endurance Run, with the top men and women finishers earning a "Golden Ticket" automatic entry.

[5] Founded by Geri Kilgraff in 2002, the inaurgural year of the race had 180 runners.