31 km. 2,200 m up. One of the hardest short mountain races in the world.
At 31.2 km with 2,091 m of climbing, this distance challenges both endurance and climbing ability without the time-management demands of a full ultra. With 67 m of vertical per kilometer, expect significant hiking sections — training should emphasise power-hiking and efficient descending. The official cutoff is 7.5 hours, so pace management starts from week one.
Expected race date: Sat, 7 August 2027By draw (lottery)31.2 km · 2,091 mStart: 11:00
Places go by draw. On last edition's dates the draw falls around Fri, 2 April 2027, before this plan starts; check the organizer's page for this year's dates. Train as planned until then.
Use this date as a planning estimate
The organizer has confirmed the event window, but not 31K's detailed start schedule. The plan currently uses the expected distance day.
I'm preparing for Sierre-Zinal 31K. Here is the public training preview.
31.2 km · +2,091 m · 309 days to race day
Public preview only; my private routes and schedule changes are not included.
Plan: https://trailsplits.com/races/sierre-zinal-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 (30 min · ~2.7 km · +225 m)
and rehearses the 67 m/km demand of 31K.
Terrain intel
Starts with a steep forest climb, transitions to exposed alpine terrain above treeline, finishes with a long descent into Zinal.
Weather & kit
August in the Valais is typically hot in the valley (35°C) and cool at altitude. Afternoon thunderstorms are possible.
What this plan focuses on
Sustained uphill power: the first 20 km are mostly climbing.
Downhill speed: the final descent is fast and contested.
Heat management: the valley start can be scorching.
Pole technique for the long climb.
Race nutrition for 3-5 hours of effort.
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 and 675 m of climbing in week one and peaks at 5h 15m and 1,650 m in a week; the longest planned outing is 2h 05m. 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.
14.4 min/km average required. At an easy all-day pace the course takes about 7 h of the 7.5 h allowed.
That leaves little margin: a bad patch, the weather or an intermediate cutoff can decide the day, and more training buys less time on a course like this than it seems.
Training emphasis: sustained climbing, downhill resilience, and efficient hike-run transitions.
Plan summary
The block begins on 2027-04-19, 28 weeks from now.
Duration
16 weeks
Start
2027-04-19
Peak weekly time
5h 15m
Peak weekly vert
1,650 m
Week 1Base Building
3h 40m ·
675 m vert
Mon · 2027-04-19rest
Rest
Effort: Rest
Rest or gentle mobility.
Tue · 2027-04-20hills
Easy hills + uphill strides
30 min · 225 m vert · ~2.7 km
Effort: Easy; strides strong but relaxed
Start with 10 minutes easy on rolling terrain. Then 6 x 20 seconds uphill strides, strong but relaxed, walking back down between them. Finish with at least 10 minutes easy; the rest of the run is easy on the hills.
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 · 2027-04-21easy
Easy run
40 min · ~5.5 km
Effort: Easy
Conversational aerobic running. Keep easy days easy enough to support the key work.
Start with 10 minutes easy on rolling terrain. Then 6 x 20 seconds uphill strides, strong but relaxed, walking back down between them. Finish with at least 10 minutes easy; the rest of the run is easy on the hills.
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 · 2027-04-28easy
Easy run
35 min · ~4.8 km
Effort: Easy
Conversational aerobic running. Keep easy days easy enough to support the key work.
Start with 10 minutes easy on rolling terrain. Then 6 x 20 seconds uphill strides, strong but relaxed, walking back down between them. Finish with at least 10 minutes easy; the rest of the run is easy on the hills.
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 · 2027-05-05easy
Easy run
40 min · ~5.5 km
Effort: Easy
Conversational aerobic running. Keep easy days easy enough to support the key work.
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 · 2027-05-12easy
Easy run
35 min · ~4.8 km
Effort: Easy
Conversational aerobic running. Keep easy days easy enough to support the key work.
Start with 10 minutes easy on rolling terrain. Then 6 x 20 seconds uphill strides, strong but relaxed, walking back down between them. Finish with at least 10 minutes easy; the rest of the run is easy on the hills.
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 · 2027-05-19easy
Easy run
40 min · ~5.5 km
Effort: Easy
Conversational aerobic running. Keep easy days easy enough to support the key work.
Start with 10 minutes easy on rolling terrain. Then 6 x 20 seconds uphill strides, strong but relaxed, walking back down between them. Finish with at least 10 minutes easy; the rest of the run is easy on the hills.
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 · 2027-05-26easy
Easy run
40 min · ~5.5 km
Effort: Easy
Conversational aerobic running. Keep easy days easy enough to support the key work.
Start with 10 minutes easy. Then 4 x 6 minutes uphill at a hard but repeatable effort, with 2 minutes 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 · 2027-06-02easy
Easy run
35 min · ~4.8 km
Effort: Easy
Conversational aerobic running. Keep easy days easy enough to support the key work.
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 · 2027-06-09easy
Easy run
45 min · ~6.2 km
Effort: Easy
Conversational aerobic running. Keep easy days easy enough to support the key work.
Start with 10 minutes easy. Then 4 x 6 minutes uphill at a hard but repeatable effort, with 2 minutes 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 · 2027-06-16easy
Easy run
35 min · ~4.8 km
Effort: Easy
Conversational aerobic running. Keep easy days easy enough to support the key work.
Start with 10 minutes easy. Then 4 x 6 minutes uphill at a hard but repeatable effort, with 2 minutes 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 · 2027-06-23easy
Easy run
40 min · ~5.5 km
Effort: Easy
Conversational aerobic running. Keep easy days easy enough to support the key work.
Start with 10 minutes easy. Then 4 x 6 minutes uphill at a hard but repeatable effort, with 2 minutes 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 · 2027-06-30easy
Easy run
45 min · ~6.2 km
Effort: Easy
Conversational aerobic running. Keep easy days easy enough to support the key work.
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 · 2027-07-07easy
Easy run
45 min · ~6.2 km
Effort: Easy
Conversational aerobic running. Keep easy days easy enough to support the key work.
Start with 10 minutes easy. Then 4 x 5 minutes on familiar, controllable terrain at controlled hard, with 2 minutes 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 · 2027-07-14easy
Easy run
45 min · ~6.2 km
Effort: Easy
Conversational aerobic running. Keep easy days easy enough to support the key work.
Start with 10 minutes easy. Then 4 x 5 minutes on familiar, controllable terrain at controlled hard, with 2 minutes 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 · 2027-07-21easy
Easy run
40 min · ~5.5 km
Effort: Easy
Conversational aerobic running. Keep easy days easy enough to support the key work.
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.
Run the 31.2 km as planned: start controlled and use the fuelling and kit rehearsed in training.
Sun · 2027-08-08recovery
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: 14.4 min/km
Exports
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Disclaimer: this plan is general information, not medical advice. Adjust based on fatigue,
experience, and injury history.
About the Sierre-Zinal 31K course
At 31.2 km with 2,091 m of climbing, this distance challenges both endurance and climbing ability without the time-management demands of a full ultra. With 67 m of vertical per kilometer, expect significant hiking sections — training should emphasise power-hiking and efficient descending. The official cutoff is 7.5 hours, so pace management starts from week one.
This training plan adapts the 16-week structure specifically for 31.2 km with 2,091 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 31K
The current 16-week schedule has these phases for 31.2 km and 2,091 m of climbing:
Weeks 1–6 — Base Building: Establish consistent aerobic training and introduce course-like terrain gradually.
Weeks 7–11 — Vert Accumulation: Increase course-specific climbing while rehearsing easy effort and fueling.
Weeks 12–14 — Peak Volume: Practise the longest planned outings and race equipment without adding extra sessions.
Week 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.
Preparing for steep terrain
At 67 m of vertical per kilometer, the Sierre-Zinal 31K course is significantly steeper than average.
In this plan the uphill sessions and the climb-and-descent rehearsals are where to practise power-hiking (with poles, if you will race with them) and steep, controlled descending, and the strength sessions carry the eccentric work for your quads.
Practice eating and drinking on steep climbs — this is where many runners lose time to nausea and energy dips.