Sierre-Zinal Training Plan: 12 Weeks to Conquer the Race of the Five 4000m Peaks

Sierre-Zinal. Three syllables that thrill every mountain runner. Nicknamed "the Race of the Five 4000m Peaks," this legendary event in the Swiss Valais connects Sierre (533 m) to Zinal (1,672 m) over 31 kilometers, with 2,200 meters of positive elevation gain and 1,100 meters of elevation loss. Along the way, you'll run under the watchful eyes of the Weisshorn, the Zinalrothorn, the Obergabelhorn, the Matterhorn, and the Dent Blanche—five giants over 4,000 meters that give this race its unique prestige 🏔️

But don't let the scenery hypnotize you. Sierre-Zinal is a formidably demanding race: an almost uninterrupted 1,500-meter climb to Chandolin, followed by a technical high-altitude section to the highest point at Nava (2,424 m), then a brutal 750-meter descent to Zinal. It's neither a classic trail race nor a typical mountain run—it's a hybrid format that rewards climbers as much as downhill runners, power as much as tactical finesse.

This 12-week training plan is designed to specifically prepare you for the demands of Sierre-Zinal. It is aimed at regular runners (3 to 5 outings per week) who already have experience in trail or mountain running and are capable of running for 1.5 to 2 hours on hilly terrain without major difficulty.

Anatomy of the Course: Know the Terrain to Better Prepare for It

Section 1: Sierre → Ponchette (km 0-8, ~1,000 m D+)

The race starts on the plain, at an altitude of 533 meters. After a short urban section, the trail immediately climbs into the Beauregard forest. This is the wall of Sierre-Zinal: between km 3 and km 6, the average gradient exceeds 25%. It's steep, crowded with runners, and the temptation to start too fast is enormous. Almost all participants—including experienced runners—walk this section. It's not an admission of weakness; it's tactical intelligence.

Section 2: Ponchette → Chandolin (km 8-12, ~500 m D+)

The slope eases slightly but the ascent continues. You reach Chandolin (1,935 m) at km 12, where the first major aid station is located. At this stage, you have already climbed about 1,500 of the total 2,200 meters of D+. It's a pivotal moment: those who pushed too hard on the wall begin to pay the price.

Section 3: Chandolin → Hôtel Weisshorn → Nava (km 12-26, ~700 m D+, ~350 m D-)

This is the most beautiful and tactical section. The course undulates at an altitude between 2,000 and 2,424 meters, alternating between moderate climbs, runnable sections, and short technical passages. The landscape is breathtaking—the five 4000m peaks are gradually revealed. After the Hôtel Weisshorn (km 19), the terrain becomes more exposed, and wind can be a factor. The highest point, Nava (2,424 m), is reached at km 26, which is 85% of the way through the race. This is where the ability to run efficiently at altitude makes the difference.

Section 4: Nava → Zinal (km 26-31, ~1,100 m D-)

The final descent. 750 meters of negative elevation gain in 5 kilometers. It's brutal, technical in places, and your quadriceps—already worn down by 26 km of effort—must endure an intense pounding. It's often in this descent that the rankings get shaken up: those who have prepared their legs for eccentric work gain dozens of places, while others suffer.

Physical Qualities to Develop

Sierre-Zinal is a 31 km mountain race—not an ultra-trail. The duration of effort is between 3h30 (very good runners) and 6h30 (cut-off time). This implies different physiological demands than an ultra:

• Aerobic Power (VO2max): Unlike an ultra where you run mainly at a base endurance pace, Sierre-Zinal is run at a relatively high intensity. Your maximum aerobic capacity is a determining factor.
• Uphill running economy: The ability to climb efficiently for 1h30 to 2h30 (depending on your level) is crucial. This involves fast walking technique, heart rate management, and the potential use of poles.
• Eccentric strength: The final descent of 750m D- on tired legs requires quads that are prepared for eccentric work.
• Running at altitude: The course runs between 2,000 and 2,424 meters for nearly 15 km. Oxygen becomes scarcer, heart rate rises faster, and the perceived effort is amplified.
• Strength endurance: The ability to maintain a constant muscular push on long, steady climbs without blowing up.

Plan Architecture: 3 Blocks of 4 Weeks

The plan is structured into three progressive blocks, each with a main objective. Each block includes 3 weeks of load followed by 1 week of recovery (at 60-65% of the volume).

Block 1 (W1-W4) — Building the Mountain Base

Objective: Develop base endurance with elevation gain, strengthen muscular structures, and establish training consistency.

Target Volume: 5 to 7 hours/week, 800 to 1,200 m D+/week

Typical Week:

• Monday: Rest or mobility/yoga (30 min)
• Tuesday: Hilly run at base endurance pace (50 min to 1h). Incorporate some natural climbs from the terrain.
• Wednesday: Specific strength training (40 min) — squats, lunges, step-ups, core work + light run (25 min)
• Thursday: Short hill repeats session — 8 to 10 × 2 min on a steep climb (12-18% grade), recovery jogging downhill. Total: 1h to 1h10
• Friday: Rest or cross-training (swimming, cycling)
• Saturday: Long hilly run (1h45 to 2h15), varied terrain, comfortable pace. Aim for 600 to 900 m D+
• Sunday: Recovery run (35-45 min) on a soft surface

Strength Training: Your Downhill Insurance

The descent to Zinal is carnage for ill-prepared quadriceps. Strength training is not optional; it's a priority. Here is the circuit to incorporate twice a week during blocks 1 and 2:

• Bulgarian split squats: 3 × 10 per leg
• Forward lunges with a long stride: 3 × 12
• Eccentric step-downs (from a high step, controlled descent on one leg): 3 × 8 per leg
• Isometric wall sit: 3 × 45 seconds
• Dynamic core work (plank + mountain climbers): 3 × 40 seconds
• Eccentric calf raises on a step: 3 × 12 per leg

Eccentric step-downs are the most important session for preparing for the descent. They simulate the muscular braking that your quads will have to produce during the last 5 kilometers. Feel free to gradually increase the height of the step over the weeks 💪

Block 2 (W5-W8) — Specific Mountain Development

Objective: Increase elevation volume, introduce long hill repeat sessions and simulated altitude work. First long run with a profile comparable to Sierre-Zinal.

Target Volume: 7 to 9 hours/week, 1,200 to 1,800 m D+/week

Typical Week:

• Monday: Rest
• Tuesday: Long hill repeats session — 4 × 6-8 min climbing at threshold pace (intensity where "I can speak in short sentences"), recovery downhill. Total: 1h15
• Wednesday: Strength training (40 min) + recovery run (30 min)
• Thursday: Fartlek on hilly terrain — 1h15 to 1h30, free alternation of paces with natural accelerations on the climbs
• Friday: Rest or active recovery
• Saturday: Long mountain run (2h30 to 3h), aim for 1,200 to 1,600 m D+. Simulate the Sierre-Zinal profile if possible: a big continuous climb + runnable sections at altitude + technical descent
• Sunday: Recovery run (40 min) or active hike (1h)

The Key Session of Block 2: Long Hill Repeats at Threshold

This session is the core of your specific preparation. It simulates the sustained effort of the Sierre-Chandolin climb. The goal is not to climb as fast as possible, but to maintain a constant and sustainable intensity on long uphill efforts.

Format: Find a steady hill with a grade of 8 to 15%. Climb for 6 to 8 minutes at a pace where you can still speak in short sentences (heart rate zone 3). Jog back down to recover. Repeat 4 to 5 times.

Progression:

• Week 5: 4 × 6 min
• Week 6: 4 × 7 min
• Week 7: 5 × 8 min
• Week 8: Recovery — 3 × 5 min

If you don't have long enough hills near you, stadium or building stairs are an excellent substitute. For those with access to an incline treadmill, set it to 12-15%—it's less specific, but it works.

Downhill Work

Starting in this block, systematically integrate technical downhill work at the end of your long run. After 2 hours of effort, find a descent of 400 to 600 meters D- and go down focusing on:

• High step frequency (short, quick strides rather than long ones)
• Looking 3 to 4 meters ahead of you
• Relaxing your upper body (shoulders down, arms loose)
• Landing on your forefoot or midfoot, never on your heel

This work under fatigue is fundamental: on race day, you'll attack the descent to Zinal after 26 km of effort and 2,200 m of D+. Your quads will already be tired—you need to get used to descending in this state.

Block 3 (W9-W12) — Peak Load and Tapering

Objective: Reach peak fitness and then gradually reduce volume to arrive fresh on race day.

Target Volume: W9-W10: 8 to 10 hours/week, 1,500 to 2,000 m D+/week. W11-W12: decrease to 4 to 5 hours.

Week 9 (Peak Week):

• Monday: Rest
• Tuesday: Long hill repeats at threshold — 5 × 8 min, 12-18% grade. This is the most intense session of the plan. Total: 1h20
• Wednesday: Light strength training (30 min) + easy run (30 min)
• Thursday: Hilly run with tempo — 1h15, including 25 min at tempo pace on a runnable section (to simulate the sections between Chandolin and Nava)
• Friday: Rest
• Saturday: Long run race simulation — 3h to 3h30, aim for 1,500 to 2,000 m D+. Replicate the Sierre-Zinal profile as much as possible: big climb + ridge + steep descent. Test your final nutrition and gear
• Sunday: Recovery run (35 min)

Week 10: Load maintained but volume slightly reduced (-10%). Last long run of 2h30 with elevation gain.

Week 11 (Tapering):

• Volume reduced to 55% of peak
• 4 short runs (40 min to 1h), one of which includes 4 × 2 min uphill at a good intensity to stay sharp
• Last run with elevation gain: 1h30, 600 m D+
• Stop strength training

Week 12 (Race Week):

• Monday-Tuesday: Easy run 30-35 min
• Wednesday: 25 min jog with 4-5 progressive 30-second strides
• Thursday-Friday: Complete rest, gear preparation
• Saturday or Sunday: Race day

Tapering is often anxiety-inducing—you feel like you're losing fitness by running less. It's the opposite: it's during this phase that your body absorbs the work from the previous weeks. To fine-tune your taper and detect any potential overtraining, monitoring your heart rate variability (HRV) is a valuable tool that will help you dose your effort until race day.

Race Strategy: Manage the 31 km Like a Pro

Before the Start

Sierre-Zinal brings together over 5,000 runners. The start is crowded, even chaotic in the first few hundred meters. Two pieces of advice:

• Don't fight for position in the first kilometers—the climb naturally sorts everyone out
• Position yourself in a corral that matches your actual level, not your ambitions for the day

Km 0-12: The Climb to Chandolin — Patience and Discipline

This is the section that defines your entire race. The golden rule: start conservatively. The perceived effort in the initial climb should be slightly less than that of a marathon. Yes, this means the first few kilometers should feel almost easy.

In concrete terms:

• Km 0-3: Jog gently in the crowd. Don't force your way through, save your energy
• Km 3-6 (the wall, >25% grade): Switch to power hiking. Everyone walks here, including the elites. Adopt a steady rhythm: short steps, torso leaning forward, pushing with your arms (or poles if allowed)
• Km 6-12: The slope eases. Alternate between power hiking and slow running depending on the terrain. Monitor your heart rate: stay below your aerobic threshold (zone 2-3). If your heart rate spikes, walk for a few minutes—you'll get it back a hundredfold later

At the Chandolin aid station (km 12), take stock: if you feel fresh and in control, your management is good. If you're already out of breath with heavy legs, you've pushed too hard—adjust the rest of your race accordingly.

Km 12-26: The High-Altitude Ridge — Run and Enjoy It

This is the most strategic and enjoyable section. The terrain undulates between 2,000 and 2,424 meters with runnable sections where you need to pick up the pace, and climbs where you need to stay patient.

• Km 12-19 (Chandolin → Hôtel Weisshorn): A mix of moderate climbs and false flats. This is where good runners start to gain places on those who pushed too hard on the climb. Run the runnable sections at a comfortable pace, walk the short steep bits
• Km 19-26 (Hôtel Weisshorn → Nava): The terrain becomes more exposed. Wind can be a factor. The last climbs before Nava (2,424 m) are less steep, but the altitude makes itself felt—your heart rate rises faster for the same effort. Don't panic, this is normal. Hydrate regularly and maintain a constant effort

On this section, eat and drink regularly. You're halfway through the race in terms of time, and the final descent will require a lot of energy. A gel or fruit paste every 30-40 minutes, a few sips of water or sports drink every 15-20 minutes.

Km 26-31: The Descent to Zinal — Let Go of the Brakes

750 meters of negative elevation gain in 5 kilometers. It's brutal, fast, and it's where everything is decided in terms of ranking. If you've managed your race well and worked on your descents in training, this is the time to capitalize.

• Increase your step frequency—short, quick strides absorb shock better than long ones
• Let gravity do the work for you—don't brake with every step, go with the slope
• Keep your eyes looking far ahead, not at your feet
• If your quads start to seize up, slow down briefly rather than risking a fall

The final few hundred meters arriving in Zinal are on the road—this is the moment to give everything you have left to cross the line in the amazing atmosphere of the finish 🎉

Nutrition and Hydration: Fueling a 3.5 to 6.5-Hour Effort

Before the Race

Last meal 3 hours before the start: rice or pasta, low in fiber, low in fat. A light snack 1 hour before if needed (energy bar, banana). Hydrate well the day before—altitude increases dehydration.

During the Race

For a race of this duration, aim for 40 to 60 grams of carbohydrates per hour. The official aid stations are well-stocked, but don't rely solely on them—carry your own gels or bars to be self-sufficient between stations.

• Km 0-12 (climb): Start eating around km 5-6, even if you're not hungry. A gel or fruit paste every 30-40 min. The effort of climbing reduces appetite, but the body needs fuel
• Km 12-26 (ridge): Maintain 40-50 g/h of carbs. Take advantage of the runnable sections to eat—it's easier when the effort is moderate. Alternate between sweet and savory if possible
• Km 26-31 (descent): It's hard to eat while descending fast. Take a final gel just before Nava to have energy in your legs for the final descent

Hydration

Plan for 400 to 600 ml per hour. With the altitude and intense effort, fluid losses are significant even if the temperature isn't scorching. One flask of water and one flask of sports drink with electrolytes is a good compromise. Refill at aid stations without wasting too much time.

Managing Altitude: The Invisible Factor

Sierre-Zinal is run between 533 and 2,424 meters. If you live at sea level, the altitude will be a significant limiting factor between km 12 and km 26—for nearly 15 kilometers.

What Happens Above 2,000 Meters

• The partial pressure of oxygen decreases by about 20-25% compared to sea level
• Your heart rate increases by 5 to 15 beats per minute for the same effort
• Ventilation accelerates, which increases dehydration
• The perceived effort is amplified—a pace that feels easy at sea level can become uncomfortable at altitude

How to Prepare

• If possible, sleep at altitude the night before the race. Even a single night at 1,500-2,000 meters helps your body partially adapt
• Integrate high-intensity work into your training: threshold hill sessions and short intervals (30 sec to 2 min) accustom your body to functioning with a high heart rate, which partially compensates for the effect of altitude
• If you live in the mountains or can access them: schedule at least 2 to 3 long runs above 1,500 meters during Block 2 or 3
• Don't panic on race day: the relative breathlessness at altitude is normal. Accept running a little slower on the sections above 2,000 meters—you'll naturally recover on the descent

Equipment: Lightweight and Specific

Shoes

Sierre-Zinal is not an ultra—maximum comfort is not the priority. Look for a compromise between grip, lightness, and protection:

• Lugged outsole for technical sections (climb in the forest, descent to Zinal)
• Low weight (ideally 250-320 g per shoe) to not weigh down your legs over 31 km
• A 4 to 6 mm drop for a good climb/descent compromise
• Sufficient cushioning to absorb the descent but not excessive—too much cushioning reduces proprioception on technical terrain

Poles

Check the regulations for the current year—the use of poles has been a subject of debate at Sierre-Zinal. If allowed, they are a definite advantage in the initial 1,500 m D+ climb. Opt for ultralight foldable poles that you can easily stow away for the runnable sections and the descent.

The Pack

Over 31 km with regular aid stations, a lightweight 3 to 5-liter vest is sufficient. Carry:

• 2 x 500 ml soft flasks
• Your gels/bars for 3 to 5 hours of effort
• A lightweight windproof layer (the ridges above 2,000 m can be windy and chilly)
• Your mobile phone (mandatory)

12-Week Summary Schedule

• W1: 5h30 — getting started, first short hill session, gear test
• W2: 6h — gradual increase, long run 1h45 with 600 m D+
• W3: 6h30 — introducing long hills (4 × 5 min), long run 2h
• W4: 4h — recovery week (60% of volume)
• W5: 7h30 — long hill repeats at threshold (4 × 6 min), long run 2h30 with 1,200 m D+
• W6: 8h — increasing hills (4 × 7 min), long run 2h45 with technical descent
• W7: 9h — block peak (5 × 8 min hills), long simulation run 3h, 1,500 m D+
• W8: 5h — recovery week
• W9: 9h30 — peak week, full simulation long run 3h-3h30 with Sierre-Zinal profile
• W10: 8h30 — load maintained, last long run 2h30
• W11: 5h — tapering, short sessions with intensity reminders
• W12: 2h30 — race week, activation and rest

Common Mistakes on Sierre-Zinal

During Preparation

• Only preparing for the climb: The final descent represents 15% of the course but can cost 20% of the total time if your legs aren't ready. Eccentric work and descents under fatigue are essential.
• Neglecting intensity work: Sierre-Zinal is not an ultra. It's a race that is run at a relatively high intensity. Threshold hill sessions and fartleks on hilly terrain are at least as important as long runs.
• Training only on the flat: If you don't have mountains nearby, compensate with stairs, an incline treadmill, and at least 2 weekends in the mountains during Block 2 or 3.
• Ignoring the altitude dimension: Running 15 km above 2,000 meters is not trivial. Accustom your body to high heart rates during training.

On Race Day

• Starting too fast on the climb: This is the number one mistake. Runners who blow up at km 20 are almost always those who climbed too hard in the first 12 kilometers. Start conservatively—always.
• Forgetting to fuel on the climb: The effort of climbing suppresses appetite. Force yourself to eat from km 5, even if you don't feel like it.
• Underestimating the wind on the ridge: A light windproof layer can be the difference between a comfortable passage and 30 minutes of agony on the exposed ridge after the Hôtel Weisshorn.
• Holding back on the descent: If you've prepared your quads, the descent to Zinal is the time to gain places and time. Don't be afraid to let go of the brakes—with technique and control.

Race Day: Pre-Race Checklist

• Race bib and timing chip attached the night before
• Shoes broken in (minimum 100 km in this model)
• Vest packed with nutrition and windbreaker checked
• Phone charged to 100% with emergency number saved
• Race plan in mind: target pace per section, nutrition strategy, mental landmarks
• Last meal 3 hours before the start, regular hydration in the morning
• Anti-chafing cream on sensitive areas (feet, thighs, armpits)

And above all: look up. Sierre-Zinal is considered the most beautiful mountain race in the world. The Matterhorn revealing itself behind the ridge, the sunlit alpine pastures, the arrival in the Zinal valley—these are images that will remain etched in your memory long after the pain in your quads has faded 🏔️