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Javelina Jundred is a desert ultramarathon famous for its Halloween-weekend “Jalloween” party atmosphere, generous trail loops and 100-mile challenge.
Course Highlights
The 2026 race runs October 31 through November 1 at the Four Peaks Staging Area. The course is a looped desert trail designed for repeated aid-station access, making it possible to run a very long ultra with a crew, pacer and changing strategy while enjoying the Sonoran landscape.
McDowell Mountain Regional Park north of Fountain Hills gives the race its sense of place, with the start and finish designed to put runners close to the most memorable parts of the destination. The course profile and terrain make it worthwhile to study the organizer maps before race day rather than relying only on the headline distance.
Race Details
The next listed race date is 2026-10-31 with a typical start around 06:00 local time. Distances include 100 miles, 100K and trail ultramarathon distances. Check the official website for registration deadlines, wave assignments, course changes, time limits and final logistics, especially if you are traveling internationally.
The official event calls it a costumed 100-mile trail run party, so plan both performance and logistics. Start early, carry a reliable hydration and lighting system, protect against desert sun and temperature swings and coordinate crew access before the staging area fills. Build a simple race-weekend plan that covers packet pickup, sleep, breakfast, hydration, transport and a post-race meeting point. For destination events, keeping the plan flexible is useful because weather and road closures can change the best way to reach the start.
Why Runners Love It
Javelina’s cult following comes from its combination of serious ultra distance and playful community culture. Costumes, themed aid stations and a supportive loop format make it less intimidating than a remote point-to-point hundred, while the 100K option gives runners a shorter but still substantial challenge.
Whether the goal is a personal best, a first long-distance finish, a relay with friends or a scenic travel experience, this event offers more than a start line. Read the organizer guidance, respect local course rules and arrive ready to enjoy the community atmosphere as well as the miles.
Official race website: https://www.aravaiparunning.com/javelina/
Race-weekend planning: Recheck the organizer website as the event approaches for final maps, bib collection windows, weather guidance, aid-station details and transport changes. A little planning goes a long way: protect sleep, identify a warm-up route near the hotel, decide where supporters will meet after the finish and keep the official emergency and course-contact information with you.
Fountain Hills, AZ United States
Javelina Jundred is a desert ultramarathon famous for its Halloween-weekend “Jalloween” party atmosphere, generous trail loops and 100-mile challenge.
Course Highlights
The 2026 race runs October 31 through November 1 at the Four Peaks Staging Area. The course is a looped desert trail designed for repeated aid-station access, making it possible to run a very long ultra with a crew, pacer and changing strategy while enjoying the Sonoran landscape.
McDowell Mountain Regional Park north of Fountain Hills gives the race its sense of place, with the start and finish designed to put runners close to the most memorable parts of the destination. The course profile and terrain make it worthwhile to study the organizer maps before race day rather than relying only on the headline distance.
Race Details
The next listed race date is 2026-10-31 with a typical start around 06:00 local time. Distances include 100 miles, 100K and trail ultramarathon distances. Check the official website for registration deadlines, wave assignments, course changes, time limits and final logistics, especially if you are traveling internationally.
The official event calls it a costumed 100-mile trail run party, so plan both performance and logistics. Start early, carry a reliable hydration and lighting system, protect against desert sun and temperature swings and coordinate crew access before the staging area fills. Build a simple race-weekend plan that covers packet pickup, sleep, breakfast, hydration, transport and a post-race meeting point. For destination events, keeping the plan flexible is useful because weather and road closures can change the best way to reach the start.
Why Runners Love It
Javelina’s cult following comes from its combination of serious ultra distance and playful community culture. Costumes, themed aid stations and a supportive loop format make it less intimidating than a remote point-to-point hundred, while the 100K option gives runners a shorter but still substantial challenge.
Whether the goal is a personal best, a first long-distance finish, a relay with friends or a scenic travel experience, this event offers more than a start line. Read the organizer guidance, respect local course rules and arrive ready to enjoy the community atmosphere as well as the miles.
Official race website: https://www.aravaiparunning.com/javelina/
Race-weekend planning: Recheck the organizer website as the event approaches for final maps, bib collection windows, weather guidance, aid-station details and transport changes. A little planning goes a long way: protect sleep, identify a warm-up route near the hotel, decide where supporters will meet after the finish and keep the official emergency and course-contact information with you.