← Halloween weekend · Sports
Javelina Jundred
A costume-friendly Halloween-weekend trail ultramarathon (100 miles, 100K and a 31K night race) on loops through McDowell Mountain Regional Park. Spectators and crews gather at the Javelina Jeadquarters hub.
When
- Sat, Oct 31100M starts 6 a.m. (wave 1) & 6:30 a.m. (wave 2); 100K 7 a.m.; Jackass 31K night trail 5:30 p.m.
Jackass 31K bib pickup at the Big Top from 4 p.m. - Sun, Nov 1Races continue overnight; 100M 30-hour limit, 100K 29-hour limit; shuttles end at noon
Course closes around midday Sunday
Dates are stated explicitly by the source.
Getting in
Spectating: $7 per vehicle per day park entry; race entry 100M $525, 100K $375, 31K $195 (plus fees)
Registration closed Oct 1, 2026 (waitlist). No vehicle access to Jeadquarters on race day; park and take the park shuttle. No pets. Organizer calls it rated R, not fully kid-friendly.
- The organizer page lists the Jackass 31K final cutoff as both 2:00 AM and 2:30 AM Sunday.
- The venue is in unincorporated Maricopa County near Fountain Hills (mailing address Fort McDowell).
- No vehicle access to Jeadquarters on race day; park and take the shuttle.
- No pets anywhere on site.
- The organizer rates it R, with explicit music and risqué costumes, so it isn't kid-friendly.
Sources
- aravaiparunning.com organizer
Oct 31-Nov 1, 2026 dates; venue and address; distances, start times and cutoffs; entry prices; spectator/crew rules; shuttle times; $7 vehicle fee; no pets; rated R