Chihuahua by UTMB® 36K: Complete Race Preparation Guide
Master the 36km UTMB® mountain course with a science-backed training plan designed for technical terrain and sustained elevation gains. Everything you need to cross the finish line.
36.0km
International
Understanding the Chihuahua by UTMB® 36K Course
The Chihuahua by UTMB® 36K is an international ultra trail event that demands respect for both distance and mountain terrain. At 36 kilometers, this race sits in the extended ultra-distance category—beyond the standard marathon but shorter than classic 50K+ ultras, making it a perfect entry point to multi-hour mountain racing or a training race for longer UTMB® events. The course is characterized by trail and mountain terrain with significant elevation challenges that will test your aerobic capacity, muscular endurance, and mental fortitude. While exact elevation figures aren't published, the terrain profile indicates sustained climbing and technical descent work will dominate your experience. The international nature of this UTMB® event means you'll compete against experienced trail runners from around the world, so preparation must be meticulous. For current details on exact elevation gain/loss, aid station locations, cutoff times, and the specific race date, visit the official website at https://chihuahua.utmb.world.
36km distance requires sustained aerobic effort across 4-6+ hours of racing
Mountain and trail terrain demands technical footwork and core stability
International UTMB® standard means well-organized but potentially challenging conditions
Training must balance volume, intensity, and terrain-specific work
Check official site for elevation profile and current course information
Chihuahua by UTMB® 36K Training Plan Overview
A 16-week training plan designed specifically for the demands of Chihuahua by UTMB® 36K.
Base Building Phase
4 weeks
Aerobic capacity and trail-specific movement patterns. Build running volume while introducing consistent hill work and technical terrain practice.
Peak: 80km/week
Strength & Endurance Phase
5 weeks
Develop muscular endurance for climbing and descending. Incorporate back-to-back long runs, elevation-specific sessions, and increased vertical gain.
Peak: 100km/week
Peak Training Phase
4 weeks
Race-specific intensity and pacing practice. Long runs at race pace, elevation simulation, fueling practice, and sustained efforts at altitude.
Peak: 110km/week
Taper & Race Prep
3 weeks
Active recovery, technique refinement, logistics planning, and mental preparation. Reduce volume while maintaining intensity to arrive fresh and confident.
Peak: 60km/week
Key Workouts
01Long trail runs: 18-24km at conversational pace on mountainous terrain to build aerobic base and practice pacing over distance
02Hill repeats: 6-10 x 4-6 minute climbs at tempo effort to build leg strength and climbing power for sustained elevation
03Back-to-back long runs: 90-minute trail run on Saturday plus 60-90 minute run on Sunday to simulate multi-hour fatigue and mental resilience
04Tempo on elevation: 30-40 minute efforts at 85-90% max heart rate on climbing terrain to develop threshold fitness specific to ascents
05Long descent practice: 8-12km with 1000m+ elevation loss at controlled paces to strengthen quads, practice braking, and build confidence on technical downhills
06Fartlek on trails: 60-90 minute mixed-pace runs with varied tempo bursts to build adaptability to changing terrain and pacing demands
07Altitude simulation workouts: If accessible, train at elevation or use treadmill incline to mimic oxygen demands of sustained climbing
08Race-pace intervals: 3-4 x 8-12 minute efforts at estimated Chihuahua race pace with active recovery between to dial in sustainable intensity
Get a fully personalized Chihuahua by UTMB® 36K training plan tailored to your fitness, schedule, and goals.
Chihuahua by UTMB® 36K Race Day Tips
1Start conservatively: The first 10km will feel easy after 16 weeks of training—resist the urge to go hard. Settle into a sustainable aerobic pace and save your legs for the climbing ahead.
2Master your fueling window: Practice your entire nutrition plan during training. Know when you'll eat, how much, and what works at sustained efforts. Altitude and exertion can compromise digestion, so test everything.
3Climb strong, descend smart: Climbing is where fitness is built, not where races are won. Stay efficient on ascents, then focus on controlled descent technique to save your quads and maintain speed on the flats.
4Use aid stations strategically: Scout the aid station locations on the official course map. Plan exactly what you'll grab at each station and practice your grab-and-go routine. Don't linger—keep moving.
5Manage mental fatigue: 36km of mountain running will challenge your mind as much as your body. Break the race into segments, focus on the current climb or descent, and use mantras to stay mentally strong when fatigue hits.
6Dial in your pacing by terrain: Don't run by watch—run by effort. Climb at a sustainable effort (power-hiking may be faster than running), move efficiently on flats, and use descents to recover and gain time.
7Weather adaptability: Check the forecast, but plan for variables. Carry a lightweight emergency layer, know where to add/remove clothing, and practice this transition during training so it's automatic on race day.
8Protect your feet: Technical terrain at speed causes blisters and hot spots. Wear proven trail shoes, bring taping supplies, and know your foot's weakness. Practice your foot care protocol during long training runs.
9Sleep and hydration matter more than food: In the three days before Chihuahua by UTMB® 36K, prioritize sleep (8+ hours nightly) and consistent hydration. These trump carb-loading in terms of race-day readiness.
10Arrive early and warm up properly: Give yourself time to adjust to the altitude, check your gear, and do a proper 15-20 minute warm-up to get your cardiovascular system activated and your mind ready for the challenge ahead.
Essential Gear for Chihuahua by UTMB® 36K
Trail running shoes with aggressive tread and protective toe cap: Non-negotiable for technical mountain terrain. Test your shoes extensively on similar trails during training.
Hydration pack or hand-carried bottle: 1.5-2L capacity depending on aid station spacing. For current aid station details, check https://chihuahua.utmb.world.
Nutrition strategy (gels, bars, chews): 200-300 calories per hour. Practice your specific brands during training to avoid digestive issues during the race.
Weather-appropriate base and mid layers: Moisture-wicking materials that you can add/remove as temperature and effort change. Avoid cotton entirely.
Emergency shell jacket or rain protection: Even if clear skies are forecast, mountain weather changes rapidly. A lightweight packable shell weighs ounces and prevents hypothermia.
Head lamp or light source: For any potential dawn or dusk running, including buffer time if you're moving slower than expected.
Electrolyte replacement drink or tablets: Sustained effort in mountain terrain demands sodium replacement, not just water. Practice your electrolyte strategy during long training runs.
Gaiter or foot protection: Technical terrain at speed can pick up small rocks; a simple gaiter prevents them from entering your shoes.
Multi-tool or small repair kit: Toenail issue, blister care, or minor gear repair. Include athletic tape, safety pins, and a small pain reliever.
Watch or GPS device with battery life for 6+ hours: Track your pace and splits, but don't rely solely on GPS in mountainous terrain where signal can drop.
Frequently Asked Questions
How do I train for Chihuahua by UTMB® 36K if I've never run an ultra before?
Start with a solid 10-15km weekly running base, then follow a structured 16-week plan that progressively builds to 24km long runs on trail. The key is consistency (4-5 runs per week) combined with back-to-back long runs to simulate the cumulative fatigue of sustained racing. Focus on technical trail work and hill repeats rather than pure speed. A coach or training plan specifically designed for this distance helps manage progression and prevents injury—consider working with UltraCoach to tailor a program to your fitness level and schedule.
What's the ideal training volume heading into Chihuahua by UTMB® 36K?
Peak weekly volume should be 100-110km during your peak training phase (4-5 weeks before the race). This includes a long run of 18-24km plus four other runs mixing easy pace, hills, tempo work, and recovery runs. However, volume must be individual—a runner with 5+ years of trail experience might handle this differently than someone newer to ultras. The training plan summary above shows how to progress safely over 16 weeks while building the specific endurance for 36km.
Should I do any altitude training before Chihuahua by UTMB® 36K?
Altitude training is beneficial if you have access, though not mandatory. High-altitude training (2000m+) for 2-3 weeks before the race can boost oxygen efficiency, but sea-level training with hill work provides similar benefits if properly structured. If the race course is at elevation, even 4-5 days of acclimatization before racing helps. Check the course details at https://chihuahua.utmb.world for max altitude and plan your arrival accordingly.
How should I fuel during the race?
Aim for 200-300 calories per hour depending on your body size and intensity. Use a mix of easy-to-digest sources: gels, chews, bars, and sports drinks at aid stations. Practice this exact nutrition plan during your long training runs—what works in training works in racing. Electrolytes are critical on sustained climbs; aim for 500-700mg sodium per hour. Start fueling from kilometer 5, not at kilometer 30 when bonking begins. Test all products beforehand to avoid digestive surprises.
What's the optimal pacing strategy for Chihuahua by UTMB® 36K?
Run the first 10km at 85% of your sustainable pace to feel out the terrain and competitors. Then settle into a consistent effort where you can still speak in sentences on flats and easier sections. On climbs, power hike if it's faster than running—ego doesn't matter, efficiency does. Use descents to recover and build time. Never chase other runners' paces; run your own race based on effort and feel. Save a final 3-5km push only if you feel strong at kilometer 31.
How do I prevent cramping during a 36km mountain run?
Cramping typically results from electrolyte depletion, dehydration, or pushing beyond your trained effort level. During training, practice consistent hydration (500ml per hour) and sodium intake (500-700mg per hour via sports drink or salt capsules). Avoid sudden intensity spikes, and taper your volume properly in the final 10 days before Chihuahua by UTMB® 36K. If cramping starts, slow down immediately, stretch lightly, and increase sodium intake at the next aid station. Magnesium and potassium from real food (bananas, nuts) in the days before race help too.
What should I do if I'm cramping or hitting the wall at kilometer 25+?
First, slow way down—walking is acceptable and often faster than struggling running. Increase your sodium and carbohydrate intake immediately; grab multiple gels or food items at the next aid station. If walls hit hard, consume simple carbs (sports drink, gels) every 5-10 minutes and focus on shorter-term goals (next kilometer, next aid station) rather than the finish. Mental breakdowns are normal in ultras—this is where your training on back-to-back long runs pays dividends. Trust your preparation and remind yourself you've done similar efforts in training.
How much weight can I safely carry during Chihuahua by UTMB® 36K?
Keep your pack weight to 2-3kg (4-7lbs) maximum. This includes hydration pack with water/sports drink (1-1.5kg), nutrition, and emergency gear. Remember that aid stations provide water and food, so you don't need to carry your entire race's calories. A lighter pack means faster running, especially on climbs and descents. Test your exact gear setup on multiple training runs to ensure comfort and that nothing chafes or bounces.
Should I do a shakeout run the day before Chihuahua by UTMB® 36K?
Yes, a gentle 20-30 minute jog at easy pace (conversations pace, mostly flat) helps clear your legs without fatiguing them. This shakeout run also serves as a mental prep tool—it reminds you that your legs work and builds race-day confidence. Do this on race day morning only if you feel fresh; otherwise, skip it and save your energy for the race itself. The days immediately before the race should prioritize sleep, hydration, and logistics prep over any running.
What's the typical finish time for Chihuahua by UTMB® 36K?
Finish times vary widely based on terrain difficulty, elevation gain, altitude, and individual fitness. Without knowing exact elevation gain, it's difficult to estimate, but 36km on mountain terrain typically takes 4.5-7 hours depending on your fitness, pacing, and the course's technical difficulty. Your training plan should include practice runs at race pace to dial in your realistic finish time. Chat with others who've run this race and compare similar course profiles to set a goal time. Check the official website at https://chihuahua.utmb.world for past race results and winner times to calibrate expectations.
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