Free 16-Week Training Plan for Javelina Jundred Jackass 31K
Fast desert loops, all-day heat management, and a race village every lap.
At 30.6 km with 355 m of climbing, this distance challenges both endurance and climbing ability without the time-management demands of a full ultra. At 12 m of vertical per kilometer, much of the course is runnable — the plan focuses on building your aerobic cruising speed while preparing you for the steeper sections. The official cutoff is 8.5 hours, so pace management starts from week one.
Race date: Sat, 31 October 2026Open entry30.6 km · 355 mStart: 18:00
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Continue Javelina Jundred Jackass 31K
Your race plan, next route workout, official GPX, fueling, cutoff, weather, and calendar link in one place.
I'm preparing for Javelina Jundred Jackass 31K. Here is the public training preview.
30.6 km · +355 m · 29 days to race day
Public preview only; my private routes and schedule changes are not included.
Plan: https://trailsplits.com/races/javelina-jundred-jackass-31k/training-plan?tier=strong-finish&strength=1&strength_track=no-gym&engine=unified
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Terrain autopilot
Find a matching route near you
We'll look for a loop near you that matches your next run (25 min · ~4 km)
and rehearses the 12 m/km demand of Jackass 31K.
Terrain intel
Mostly runnable Sonoran Desert single-track with hard-packed granite, rock, sand, and repeated rolling climbs on the Pemberton, Shallmo, Cinch, and Escondido trails.
Weather & kit
Late October can still be hot and exposed by day, then cool rapidly after sunset. Shade is limited and most 100-mile runners continue well into the night.
What this plan focuses on
Heat acclimation and disciplined hydration for exposed desert running.
Runnable ultra endurance without overpacing the early loops.
Foot care for repeated hard-packed, rocky, and sandy terrain.
Night running while maintaining a steady run-walk rhythm.
Efficient crew stops at the start-finish race village each loop.
Unified race plan · beta
Uses the same load, recovery and taper rules as race discovery, with course-specific climbing only because this course has verified elevation.
Use it for race-effort sessions and race day. Easy runs stay easy whatever the goal; the plan's efforts come from how you run now.
Your starting point
Not stated. The plan assumes a typical starting week for this race and opens at 3h 40m of running.
Fit the plan to your recent training
This schedule opens at 3h 40m of running in week one and peaks at 5h 15m in a week; the longest planned outing is 2h 15m. These are prescriptions, not proof of readiness.
Adjust this plan
Swap concrete training days, or mark a day done/skipped without changing the race-specific template.
Calendar subscriptions refresh on the calendar app's schedule. This calendar export uses the selected start date and includes weekly summaries and any pre-base sessions. Use Keep this plan above for a fixed copy of the displayed race schedule.
Route-aware workouts
Key sessions include route buttons that deep-link into the Planner with pre-filled distance
+ elevation filters.
Little downhill to prepare for; general strength still helps.
Peak week target
0 m
5h 15m total training time
Cutoff pressure
Generous cutoff
16.7 min/km average required. At an easy all-day pace the course takes about 3.5 h of the 8.5 h allowed.
Training emphasis: aerobic cruising speed, cadence control, and late-race leg speed.
Plan summary
You are in week 12 of 16. The block began on 2026-07-13; the weeks before today are behind you, not ahead.
Duration
16 weeks
Start
2026-07-13
Peak weekly time
5h 15m
Peak weekly vert
0 m
Week 1Base Building
3h 40m ·
0 m vert
Mon · 2026-07-13rest
Rest
Effort: Rest
Rest or gentle mobility.
Tue · 2026-07-14easy
Easy run + strides
35 min · ~5.5 km
Effort: Easy; strides fast but relaxed
Start with 10 minutes easy. Then 6 x 20 seconds relaxed strides, with 1 minute easy between repeats. Finish with at least 10 minutes easy; any remaining time is easy.
Effort: Moderate: controlled reps, stop 1–2 short of failure
No-gym Session A: Bulgarian split squat, single-leg RDL, step-ups (bench/stairs), calf raises, side plank. Quality reps; stop well before failure. If 10 reps feels easy, add weight (backpack/water) so the last 2 reps feel challenging. In peak weeks, keep it short and easy.
Wed · 2026-07-15easy
Easy run
40 min · ~6.3 km
Effort: Easy
Conversational aerobic running. Keep easy days easy enough to support the key work.
Build relaxed time on feet at conversational effort. Practise the fuel, hydration and kit you intend to use; treat amounts as rehearsal, not a universal prescription.
Start with 10 minutes easy. Then 6 x 20 seconds relaxed strides, with 1 minute easy between repeats. Finish with at least 10 minutes easy; any remaining time is easy.
Effort: Moderate: controlled reps, stop 1–2 short of failure
No-gym Session A: Bulgarian split squat, single-leg RDL, step-ups (bench/stairs), calf raises, side plank. Quality reps; stop well before failure. If 10 reps feels easy, add weight (backpack/water) so the last 2 reps feel challenging. In peak weeks, keep it short and easy.
Wed · 2026-07-22easy
Easy run
40 min · ~6.3 km
Effort: Easy
Conversational aerobic running. Keep easy days easy enough to support the key work.
Build relaxed time on feet at conversational effort. Practise the fuel, hydration and kit you intend to use; treat amounts as rehearsal, not a universal prescription.
Start with 10 minutes easy. Then 6 x 20 seconds relaxed strides, with 1 minute easy between repeats. Finish with at least 10 minutes easy; any remaining time is easy.
Effort: Moderate: controlled reps, stop 1–2 short of failure
No-gym Session A: Bulgarian split squat, single-leg RDL, step-ups (bench/stairs), calf raises, side plank. Quality reps; stop well before failure. If 10 reps feels easy, add weight (backpack/water) so the last 2 reps feel challenging. In peak weeks, keep it short and easy.
Wed · 2026-07-29easy
Easy run
40 min · ~6.3 km
Effort: Easy
Conversational aerobic running. Keep easy days easy enough to support the key work.
Build relaxed time on feet at conversational effort. Practise the fuel, hydration and kit you intend to use; treat amounts as rehearsal, not a universal prescription.
Start with 10 minutes easy. Then 4 x 20 seconds relaxed strides, with 1 minute easy between repeats. Finish with at least 10 minutes easy; any remaining time is easy.
Effort: Moderate: controlled reps, stop 1–2 short of failure
No-gym Session A: Bulgarian split squat, single-leg RDL, step-ups (bench/stairs), calf raises, side plank. Quality reps; stop well before failure. If 10 reps feels easy, add weight (backpack/water) so the last 2 reps feel challenging. In peak weeks, keep it short and easy.
Wed · 2026-08-05easy
Easy run
40 min · ~6.3 km
Effort: Easy
Conversational aerobic running. Keep easy days easy enough to support the key work.
Build relaxed time on feet at conversational effort. Practise the fuel, hydration and kit you intend to use; treat amounts as rehearsal, not a universal prescription.
Start with 10 minutes easy. Then 6 x 20 seconds relaxed strides, with 1 minute easy between repeats. Finish with at least 10 minutes easy; any remaining time is easy.
Effort: Moderate: controlled reps, stop 1–2 short of failure
No-gym Session A: Bulgarian split squat, single-leg RDL, step-ups (bench/stairs), calf raises, side plank. Quality reps; stop well before failure. If 10 reps feels easy, add weight (backpack/water) so the last 2 reps feel challenging. In peak weeks, keep it short and easy.
Wed · 2026-08-12easy
Easy run
40 min · ~6.3 km
Effort: Easy
Conversational aerobic running. Keep easy days easy enough to support the key work.
Build relaxed time on feet at conversational effort. Practise eating and drinking on longer easy runs; easy pace is not a reason to skip fueling. For runs lasting 1 to 2.5 hours, 30 to 60 g of carbohydrate per hour is a useful starting range; beyond 2.5 hours, build toward 60 to 90 g per hour if you have practised it and tolerate it. Adjust fluid to your needs and the conditions.
Start with 10 minutes easy. Then 6 x 20 seconds relaxed strides, with 1 minute easy between repeats. Finish with at least 10 minutes easy; any remaining time is easy.
Effort: Moderate: controlled reps, stop 1–2 short of failure
No-gym Session A: Bulgarian split squat, single-leg RDL, step-ups (bench/stairs), calf raises, side plank. Quality reps; stop well before failure. If 10 reps feels easy, add weight (backpack/water) so the last 2 reps feel challenging. In peak weeks, keep it short and easy.
Wed · 2026-08-19easy
Easy run
35 min · ~5.5 km
Effort: Easy
Conversational aerobic running. Keep easy days easy enough to support the key work.
Build relaxed time on feet at conversational effort. Practise eating and drinking on longer easy runs; easy pace is not a reason to skip fueling. For runs lasting 1 to 2.5 hours, 30 to 60 g of carbohydrate per hour is a useful starting range; beyond 2.5 hours, build toward 60 to 90 g per hour if you have practised it and tolerate it. Adjust fluid to your needs and the conditions.
Effort: Moderate: controlled reps, stop 1–2 short of failure
No-gym Session A: Bulgarian split squat, single-leg RDL, step-ups (bench/stairs), calf raises, side plank. Quality reps; stop well before failure. If 10 reps feels easy, add weight (backpack/water) so the last 2 reps feel challenging. In peak weeks, keep it short and easy.
Tue · 2026-08-25tempo
Cruise intervals
50 min · ~8.3 km
Effort: Comfortably hard
Start with 10 minutes easy. Then 4 x 5 minutes at a comfortably hard effort, with 2 minutes easy between repeats. Finish with at least 10 minutes easy; any remaining time is easy.
Run the first 13.9 km easy and conversational (about 89 minutes), then hold marathon pace for the final 4 km (about 21 minutes) and finish in control, not emptied. Marathon pace is the pace you can currently hold on race day, not a hoped-for one. Practise your race-day carbohydrate plan on this long run: 30 to 90 g per hour according to expected marathon duration, pace and stomach tolerance. Build toward the higher end only if you have practised it. Count the carbohydrate grams in your gels, drinks and other food rather than following a fixed gel interval. Practise drinking for your needs and the conditions; avoid overdrinking.
Start with 10 minutes easy. Then 6 x 20 seconds relaxed strides, with 1 minute easy between repeats. Finish with at least 10 minutes easy; any remaining time is easy.
Effort: Moderate: controlled reps, stop 1–2 short of failure
No-gym Session A: Bulgarian split squat, single-leg RDL, step-ups (bench/stairs), calf raises, side plank. Quality reps; stop well before failure. If 10 reps feels easy, add weight (backpack/water) so the last 2 reps feel challenging. In peak weeks, keep it short and easy.
Wed · 2026-09-02easy
Easy run
30 min · ~4.8 km
Effort: Easy
Conversational aerobic running. Keep easy days easy enough to support the key work.
Build relaxed time on feet at conversational effort. Practise the fuel, hydration and kit you intend to use; treat amounts as rehearsal, not a universal prescription.
Effort: Moderate: controlled reps, stop 1–2 short of failure
No-gym Session A: Bulgarian split squat, single-leg RDL, step-ups (bench/stairs), calf raises, side plank. Quality reps; stop well before failure. If 10 reps feels easy, add weight (backpack/water) so the last 2 reps feel challenging. In peak weeks, keep it short and easy.
Tue · 2026-09-08tempo
Cruise intervals
55 min · ~9.2 km
Effort: Comfortably hard
Start with 10 minutes easy. Then 4 x 6 minutes at a comfortably hard effort, with 2 minutes easy between repeats. Finish with at least 10 minutes easy; any remaining time is easy.
Run the first 12.5 km easy and conversational (about 78 minutes), then hold marathon pace for the final 8 km (about 42 minutes) and finish in control, not emptied. Marathon pace is the pace you can currently hold on race day, not a hoped-for one. Practise your race-day carbohydrate plan on this long run: 30 to 90 g per hour according to expected marathon duration, pace and stomach tolerance. Build toward the higher end only if you have practised it. Count the carbohydrate grams in your gels, drinks and other food rather than following a fixed gel interval. Practise drinking for your needs and the conditions; avoid overdrinking.
Effort: Moderate: controlled reps, stop 1–2 short of failure
No-gym Session A: Bulgarian split squat, single-leg RDL, step-ups (bench/stairs), calf raises, side plank. Quality reps; stop well before failure. If 10 reps feels easy, add weight (backpack/water) so the last 2 reps feel challenging. In peak weeks, keep it short and easy.
Tue · 2026-09-15tempo
Cruise intervals
55 min · ~9.2 km
Effort: Comfortably hard
Start with 10 minutes easy. Then 3 x 8 minutes at a comfortably hard effort, with 2 minutes easy between repeats. Finish with at least 10 minutes easy; any remaining time is easy.
Run the first 12.4 km easy and conversational (about 78 minutes), then hold marathon pace for the final 9 km (about 47 minutes) and finish in control, not emptied. Marathon pace is the pace you can currently hold on race day, not a hoped-for one. Practise your race-day carbohydrate plan on this long run: 30 to 90 g per hour according to expected marathon duration, pace and stomach tolerance. Build toward the higher end only if you have practised it. Count the carbohydrate grams in your gels, drinks and other food rather than following a fixed gel interval. Practise drinking for your needs and the conditions; avoid overdrinking.
Effort: Moderate: controlled reps, stop 1–2 short of failure
No-gym Session A: Bulgarian split squat, single-leg RDL, step-ups (bench/stairs), calf raises, side plank. Quality reps; stop well before failure. If 10 reps feels easy, add weight (backpack/water) so the last 2 reps feel challenging. In peak weeks, keep it short and easy.
Tue · 2026-09-22tempo
Marathon-effort blocks
1h 05m · ~10.8 km
Effort: Steady and controlled
Start with 10 minutes easy. Then 3 x 12 minutes at a steady, controlled effort, with 2 minutes easy between repeats. Finish with at least 10 minutes easy; any remaining time is easy.
Run the first 12.9 km easy and conversational (about 83 minutes), then hold marathon pace for the final 9 km (about 47 minutes) and finish in control, not emptied. Marathon pace is the pace you can currently hold on race day, not a hoped-for one. Practise your race-day carbohydrate plan on this long run: 30 to 90 g per hour according to expected marathon duration, pace and stomach tolerance. Build toward the higher end only if you have practised it. Count the carbohydrate grams in your gels, drinks and other food rather than following a fixed gel interval. Practise drinking for your needs and the conditions; avoid overdrinking.
Start with 10 minutes easy. Then 6 x 20 seconds relaxed strides, with 1 minute easy between repeats. Finish with at least 10 minutes easy; any remaining time is easy.
Effort: Moderate: controlled reps, stop 1–2 short of failure
No-gym Session A: Bulgarian split squat, single-leg RDL, step-ups (bench/stairs), calf raises, side plank. Quality reps; stop well before failure. If 10 reps feels easy, add weight (backpack/water) so the last 2 reps feel challenging. In peak weeks, keep it short and easy.
Wed · 2026-09-30easy
Easy run
35 min · ~5.5 km
Effort: Easy
Conversational aerobic running. Keep easy days easy enough to support the key work.
Use race-like terrain where practical, but keep the overall effort controlled. Practise eating and drinking on longer easy runs; easy pace is not a reason to skip fueling. For runs lasting 1 to 2.5 hours, 30 to 60 g of carbohydrate per hour is a useful starting range; beyond 2.5 hours, build toward 60 to 90 g per hour if you have practised it and tolerate it. Adjust fluid to your needs and the conditions.
Effort: Moderate: controlled reps, stop 1–2 short of failure
No-gym Session A: Bulgarian split squat, single-leg RDL, step-ups (bench/stairs), calf raises, side plank. Quality reps; stop well before failure. If 10 reps feels easy, add weight (backpack/water) so the last 2 reps feel challenging. In peak weeks, keep it short and easy.
Tue · 2026-10-06tempo
Marathon-effort blocks
1h 00m · ~10 km
Effort: Steady and controlled
Start with 10 minutes easy. Then 2 x 15 minutes at a steady, controlled effort, with 2 minutes easy between repeats. Finish with at least 10 minutes easy; any remaining time is easy.
Run the first 13 km easy and conversational (about 83 minutes), then hold marathon pace for the final 10 km (about 52 minutes) and finish in control, not emptied. Marathon pace is the pace you can currently hold on race day, not a hoped-for one. Practise your race-day carbohydrate plan on this long run: 30 to 90 g per hour according to expected marathon duration, pace and stomach tolerance. Build toward the higher end only if you have practised it. Count the carbohydrate grams in your gels, drinks and other food rather than following a fixed gel interval. Practise drinking for your needs and the conditions; avoid overdrinking.
Start with 10 minutes easy. Then 4 x 2 minutes at controlled race effort, with 1 minute easy between repeats. Finish with at least 10 minutes easy; any remaining time is easy.
Run the first 9.9 km easy and conversational (about 60 minutes), then hold marathon pace for the final 3 km (about 15 minutes) and finish in control, not emptied. Marathon pace is the pace you can currently hold on race day, not a hoped-for one. Keep food and drink familiar and appropriate to this shorter run. This is a marathon-pace reminder, not a full race-fueling rehearsal. Keep the whole run short and comfortable.
Start with 10 minutes easy. Then 3 x 2 minutes at controlled race effort, with 1 minute easy between repeats. Finish with at least 10 minutes easy; any remaining time is easy.
Keep this comfortable and finish with plenty in reserve. Practise the fuel, hydration and kit you intend to use; treat amounts as rehearsal, not a universal prescription.
Run the 30.6 km as planned: start controlled and use the fuelling and kit rehearsed in training.
Sun · 2026-11-01recovery
Post-race recovery
Effort: Rest or very easy
Prioritize rest, food, fluids and gentle movement; do not schedule a workout by default.
Cutoff check
If your race has a time limit, this estimates the minimum average pace and whether your
target finish time clears the cutoff.
Result
Min pace: 16.7 min/km
Exports
Use the personal subscription URL for a live saved plan. Calendar links regenerate from their parameters and may reflect updated race facts or engine fixes. A kept plan and its downloads remain unchanged.
Disclaimer: this plan is general information, not medical advice. Adjust based on fatigue,
experience, and injury history.
About the Javelina Jundred Jackass 31K course
At 30.6 km with 355 m of climbing, this distance challenges both endurance and climbing ability without the time-management demands of a full ultra. At 12 m of vertical per kilometer, much of the course is runnable — the plan focuses on building your aerobic cruising speed while preparing you for the steeper sections. The official cutoff is 8.5 hours, so pace management starts from week one.
This training plan adapts the 16-week structure specifically for 30.6 km with 355 m of elevation gain,
scaling weekly volume and vert targets so your body is ready for race-day demands.
This distance sits at the boundary between endurance and speed — long enough to require serious aerobic preparation, but short enough that pace efficiency and descending technique make a real difference.
The plan builds weekly volume progressively while including hill-specific sessions to sharpen climbing and descending rhythm.
Training phases for Jackass 31K
The current 16-week schedule has these phases for 30.6 km and 355 m of climbing:
Weeks 1–6 — Base Building: Establish consistent aerobic training and introduce course-like terrain gradually.
Weeks 7–10 — Build: Reduce training load while retaining a small amount of familiar intensity.
Weeks 11–13 — Peak Volume: Practise the longest planned outings and race equipment without adding extra sessions.
Weeks 14–15 — Taper: Reduce training load while retaining a small amount of familiar intensity.
Week 16 — Race week: Reduce training and follow the race-day plan.
Pacing a runnable course
At 12 m of vertical per kilometer, much of the Javelina Jundred Jackass 31K course is runnable.
Training should emphasise aerobic cruising speed — tempo runs on rolling terrain, sustained effort on moderate climbs, and efficient flat-to-uphill transitions.
The biggest risk on a runnable course is starting too fast; practice negative-split long runs to build discipline.