Javelina Jackass 31k 2026
The forecast arrives five days before the start.
Here you'll find the elevation profile, an estimated finish time based on your UTMB Index and details of the 3 aid stations to plan your nutrition and hydration segment by segment.
What's your time based on your UTMB?
Times estimated by the RAVIT model, learned from real ultra-trail finish times. Enter your UTMB Index (utmb.world) to get a personalized estimate.
Cut-off times and crew - Javelina Jackass 31k · 2026
Data from the official race rules, checked for every edition. The race rules prevail. Positions are interpolated along the GPX track and are a guide, not official course marking.
What you'll find at each aid station
| Product | Coyote Camp Aidkm 6.3 | Jackass Junction Aidkm 16.6 | Rattlesnake Ranch Aidkm 24.8 |
|---|---|---|---|
| Water | ✕ | ✕ | ✕ |
| Brand products | ✕ | ✕ | ✕ |
Elevation profile
The course and its aid stations
Javelina Jackass 31k: times, aid-station stops and fuelling needs by UTMB® Index
Between a UTMB® Index of 500 and 800, the estimated finish time on this race runs from 3h03 to 2h08, and the aid-station stop budget from 0h04 to 0h02. The longer the race, the more stops weigh: this is time you should plan to spend standing still, not only running.
| UTMB® Index | Estimated time | Of which stops | Night hours | Carbs | Fluid | Sodium | Cut-off margin |
|---|---|---|---|---|---|---|---|
| 500 | 3h03 | 0h04 | 0.1 | 183 g | 2.1 L | 1,521 mg | +6h27 |
| 550 | 2h49 | 0h03 | — | 169 g | 2 L | 1,411 mg | +6h41 |
| 600 | 2h39 | 0h03 | — | 159 g | 1.9 L | 1,321 mg | +6h51 |
| 650 | 2h30 | 0h02 | — | 150 g | 1.7 L | 1,248 mg | +7h00 |
| 700 | 2h22 | 0h02 | — | 142 g | 1.7 L | 1,185 mg | +7h08 |
| 750 | 2h15 | 0h02 | — | 135 g | 1.6 L | 1,126 mg | +7h15 |
| 800 | 2h08 | 0h02 | — | 128 g | 1.5 L | 1,065 mg | +7h22 |
Figures based on 60 g of carbohydrate, 700 mL of fluid and 500 mg of sodium per hour, "average" preparation and mild conditions (15–25 °C). Above 25 °C, count on roughly 900 mL/h and 700 mg/h. Carbohydrate intake is trained: 60 g/h is a floor, 90 g/h assumes a glucose-fructose blend and a gut used to it.
Other trails worth preparing for
- Elk-King 50K48 km · 1,943 m D+ · October 17, 2026
- Pumpkin Hollar 25K25 km · 300 m D+ · October 17, 2026
- Wild Duluth 50K48 km · 1,511 m D+ · October 17, 2026
- Fort Collins - Half Marathon22 km · 460 m D+ · October 18, 2026
- Fort Collins - Marathon43 km · 1,162 m D+ · October 18, 2026
- Coldwater Trail 25k25 km · 619 m D+ · November 1, 2026
- Lake Chabot 50K49 km · 1,896 m D+ · November 7, 2026
- Mt. Tam 50k48 km · 2,005 m D+ · November 7, 2026
- HOKA Pacific Trails California by UTMB - 25K®25 km · 667 m D+ · November 15, 2026
Sources and method
- Time projection — les temps par cote sont repris des passages réels des coureurs de chaque tranche sur les éditions précédentes de cette course, arrêts aux ravitaillements compris. Aucune formule n'intervient tant que ces résultats existent.
- Trail nutrition — hourly targets for carbohydrate, fluid and sodium follow the commonly accepted ultra-endurance guidance. La Clinique du Coureur — Fuelling in trail running
- Course, aid stations and cut-offs — taken from the event's official rules, which prevail in case of any discrepancy. Official site — Javelina Jackass 31k
Weather for Javelina Jackass 31k
The weather for Javelina Jackass 31k will appear here as soon as the forecast models reach that date, around five days before the start: feels-like temperature, rain, snow, wind and storms, section by section and at your passage time.
Detailed weather for Javelina Jackass 31k, hour by hour on the courseFrequently asked questions
How many checkpoints?
Javelina Jackass 31k has 4 checkpoints: 3 aid stations and 1 checkpoint with undocumented contents. Details are in the two tables above.
What's the longest segment without aid?
The one leading to Jackass Junction Aid: 10.4 km and 236 m elevation gain. That's the one to load up for first.
How do I find the exact location of an aid station?
The Google Maps icon in the “Access” column opens the aid station's location: handy for planning your crew's routes.
What distance and elevation gain?
Javelina Jackass 31k is 31 km long with 322 m of elevation gain.
How long to finish?
With a UTMB Index of 600 (average runner), the estimated time is around 2h39 for Javelina Jackass 31k.
What's the weather forecast?
The weather for Javelina Jackass 31k will be published on this page around five days before the start, once the forecast models reach the race date. It will be detailed section by section: feels-like temperature, rain, snow, wind and storms.
Want to stack the odds in your favor for Javelina Jackass 31k?
In 2 minutes, RAVIT generates your complete plan: segment-by-segment time, carbs, water and sodium at every aid station, printable roadbook.
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