Photo: Desafío Ultra El CainejoCaín de Valdeón, León
Desafío Ultra El Cainejo
Saturday, 22 May 2027estimated date
Desafío Ultra El Cainejo 2027: estimated date 22 May 2027
The organiser has not published the official 2027 schedule yet. The estimated date is based on last year's edition; we'll confirm it as soon as it's announced. Start sorting your gear and logistics.
Race data
| Modality | Distance | Elevation Gain | UTMB | Max Time | Price |
|---|---|---|---|---|---|
| Desafío Ultra 52K | 52 km | D+ 5500m |  100K | 16h | 104 EUR |
| Cainejo 35K | 35.7 km | D+ 3200m |  50K | 12h | 72 EUR |
| Cainejín 19K | 19.5 km | D+ 1800m |  20K | 6h | 53 EUR |
Desafío Ultra El Cainejo requires mandatory gear: get it sorted early
Buying guides with the best value for money, picked for this kind of terrain.
What you need
Salomon
Salomon Speedcross 6
Petzl
Petzl Actik Core
Maurten
Maurten Gel 100
How long will it take you?
Estimate your race time based on distance, elevation and your runner level.
Historical weather
Typical weather for the race date (10-year average)
Temperature
6°C – 16°C
Average 11°C
Rain
57%
2.2 mm avg
Wind
14 km/h
max. average
Sunshine hours
11h
daily average
Gear recommendations
Bring a waterproof jacket (57% chance of rain)
Asics
Asics Gel-Trabuco 14 GTX
A best-selling beginner trail shoe: GEL cushioning, good stability and a waterproof GORE-TEX membrane. Versatile and reliable for training on mixed terrain in any weather.
Berghaus
Berghaus Paclite 2.0 GTX
Waterproof jacket with a Gore-Tex Paclite membrane (around 330 g). Fully waterproof with taped seams, fixed adjustable hood, storm flap behind the zip and cuff adjustment. Packs down small in a vest. Heavier than a pure running hardshell, but it meets the waterproof-breathable membrane requirement in race rules and is the affordable route into Gore-Tex.
Gore Wear
Gore Wear C5 GORE-TEX Glove
Glove with a fully waterproof, windproof GORE-TEX membrane and light insulation. The pick for running in snow, sleet or heavy rain while keeping your hand dry.
Gore Wear
Gore Wear M GORE-TEX Thermo Glove
Warmer variant of the Gore Wear C5 GORE-TEX: the same fully waterproof, windproof membrane, with extra thermal lining for intense cold on top of snow or rain. The pick when the problem isn't just water, but water AND hard cold at once.
Gore Wear
Gore Wear R7 GTX Shakedry
Chubasquero Gore-Tex Shakedry ultraligero (110 g). Impermeabilidad total sin membrana interior, altamente transpirable. El referente para corredores de montaña.
Nike
Nike Pegasus Trail 5 GORE-TEX
The best-selling gateway trail shoe: comfortable, cushioned and versatile for moving from road to trail. Waterproof GORE-TEX version, perfect for beginners and easy runs on mixed terrain.
Salomon
Salomon Bonatti Pro Waterproof Glove
Lightweight waterproof glove built for running, not just standing still in the snow: a waterproof membrane with more dexterity and less bulk than a thick membrane glove, for sustained rain without giving up handling gels or poles.
Salomon
Salomon Bonatti WP
Chaqueta cortavientos impermeable ultraligera (135 g). Costuras selladas, capucha ajustable y ventilación trasera. Se pliega en su propio bolsillo.
Sealskinz
Sealskinz Waterproof Lightweight Glove
Lightweight waterproof glove from a brand that specializes in outdoor sport waterproofing. A solid middle ground between a thin windproof glove and a thick membrane glove: genuinely waterproof without the bulk or price of the Gore C5.
TRIWONDER
TRIWONDER Polainas Impermeables Trail
Waterproof, breathable low gaiters for trail running, hiking and mountain use. Under-shoe strap and adjustable elastic band. A budget-friendly alternative to premium technical brand gaiters.
Bring thermal layers (low of 6°C)
Buff
Buff Thermonet
Buff tubular térmico con tecnología Primaloft. Retiene el calor corporal, ultraligero y polivalente: gorro, braga, cinta. Ideal para alta montaña.
Craft
Craft Pro Hypervent LS Wind Top
Thermal top with a windproof ripstop panel on the chest and a highly ventilated soft jersey back. Built for high-intensity sessions in cold, windy conditions, with long cuffs and thumb loops.
HANKER
HANKER Braga de Cuello Térmica
Unisex thermal seamless neck gaiter in Soft Air Plus fabric (97% polyester). Seamless fit designed for trail running, cycling, motorcycling and outdoor sports. A budget alternative to Buff for moderate cold.
Icebreaker
Icebreaker Merino 200 Oasis LS Crewe
Long-sleeve thermal top in 100% merino wool (200g). Natural temperature regulation, genuine multi-day odor resistance and a soft, non-itch handfeel from the fine merino yarn.
Odlo
Odlo Active Warm Eco
Camiseta térmica de manga larga con tejido reciclado y tratamiento antiolor. Regulación térmica activa, ideal como capa base en montaña.
Odlo
Odlo I-Thermic Longsleeve Mujer
Women's long-sleeve thermal top with insulating panels placed over cold-sensitive areas (lower back and kidneys). A mid-layer built for genuinely cold winter conditions, mountain outings or cross-country-style trail sessions.
Salomon
Salomon Agile LS Tee
Lightweight quick-dry polyester long-sleeve tee with underarm mesh, a side pocket and reflective details. Works as a standalone layer in mild cold or as a base layer under a windbreaker on colder days.
Salomon
Salomon Cross Run Tight
Mallas largas de trail con tejido elástico y transpirable. Cintura ajustable, bolsillo trasero con cremallera. Protección contra el frío y la vegetación.
Salomon
Salomon Cross Warm Glove
Guantes térmicos de running con palma antideslizante y puntas táctiles. Ligeros, cálidos y compatibles con bastones.
Under Armour
Under Armour ColdGear Armour Compression Mock
Compression thermal top with a dual-layer fabric: ultra-warm brushed interior and quick-dry exterior. Second-skin compression fit with stretch mesh panels at the back and underarms for ventilation without losing warmth.
Forecast for 22 May
Real-time data from Open-Meteo
Desafío Ultra El Cainejo
Desafío Ultra El Cainejo takes place every May in Caín de Valdeón, a village deep in the heart of Picos de Europa National Park (León). It’s one of Spain’s most technical and vertical trail races, with routes following ancient shepherd paths through the most imposing massifs of the Cantabrian Mountains.
The distances
The 2026 edition features three races:
- Desafío Ultra 52K — 5,500m D+, starting Saturday May 23 at 6:00 AM. The flagship race traverses limestone channels, exposed sections with ropes and chains, and packs an extreme elevation-to-distance ratio.
- Cainejo 35K — 3,200m D+, starting Saturday May 23 at 6:45 AM. Shares part of the ultra route in a more accessible but equally demanding format.
- Cainejín 19K — 1,800m D+, starting Sunday May 24 at 8:00 AM. 6-hour time limit. The shorter option, but with an incredibly high elevation-per-kilometre ratio.
The terrain
Picos de Europa is pure limestone. The routes cross steep channels, exposed ridges and sections requiring ropes and chains to progress. The terrain is loose, technical and demands constant concentration. The trails the race follows were carved by shepherds moving their flocks between the valleys and highland pastures. Read our best trail running shoes guide for advice on choosing footwear for this type of technical limestone terrain.
Caín de Valdeón
Caín is a village of barely 30 inhabitants at the bottom of the Cares Gorge, surrounded by vertical walls exceeding 2,000 metres. Access is via a narrow mountain road that winds through limestone walls. It’s an isolated place with no mobile coverage, where the mountain sets the rules.
The Ruta del Cares
Part of the route coincides with the famous Ruta del Cares, but there’s a strict rule: running on this section is prohibited. The organisation places time controls and violations result in automatic disqualification.
May weather
May in Picos de Europa is unpredictable. Valleys can be warm, but summit conditions can be wintry: wind, rain, fog and even residual snow above 2,000 metres. Preparation for any weather scenario is mandatory.
Use our time estimator to set realistic goals for the Ultra 52K, and review the mandatory gear guide before heading to Picos. Explore more races in Castilla y Leon.
Mandatory Gear
According to the official race regulations
360Complete Pack
Desafío El Cainejo 2026 Registration
RegistrationThree distances with registration through 321go.es. Limited spots and medical certificate required.
Browse all registrationTips
- •€104 Ultra 52K, €72 Cainejo 35K, €53 Cainejín 19K
- •Registration open from December until May 18 (or until spots run out)
- •Medical fitness certificate mandatory
- •Refund policy: 100% before February 28, 50% in March, 0% from April onwards
Where to stay for Desafío El Cainejo
AccommodationCaín de Valdeón is a tiny village with very limited accommodation. Posada de Valdeón and Arenas de Cabrales are nearby alternatives.
Browse all accommodationTips
- •La Casona de Palmira in Caín is the official race headquarters
- •Posada de Valdeón (6 km away) has more accommodation options
- •Arenas de Cabrales (Asturias) is 30 min via the Cares road
- •Book well in advance: accommodation in the whole area is very limited
- •Camping or motorhome option available in the area
Gear for Desafío El Cainejo
GearTechnical high mountain in Picos de Europa. Sections with ropes and chains, limestone channels and very exposed terrain. May can bring winter conditions at the summits.
Salomon
Salomon Speedcross 6
Salomon's most versatile trail shoe, ideal for technical terrain and mud. Exceptional grip with Contagrip sole and EnergyCell+ cushioning.
Petzl
Petzl Actik Core
Frontal recargable de 600 lúmenes con batería Core incluida. Compatible con pilas AAA. Modo rojo para preservar la visión nocturna. Ideal para ultras con tramos nocturnos.
Leki
Leki Ultratrail FX.One
Foldable trail running poles in 3 sections (110-130 cm). Ultralight carbon (175 g per pole), compact 38 cm folded. Speed Lock 2 locking system.
Gore Wear
Gore Wear R7 GTX Shakedry
Chubasquero Gore-Tex Shakedry ultraligero (110 g). Impermeabilidad total sin membrana interior, altamente transpirable. El referente para corredores de montaña.
Black Diamond
Black Diamond Distance Carbon Z
Ultralight carbon Z-pole foldable trekking poles. 137 g per pole in 110 cm length, 33 cm folded. EVA grip and adjustable strap. The trail running reference.
Hoka
Hoka Speedgoat 7
The best-selling trail shoe in the US and an absolute ultra-trail classic. Max Hoka cushioning, a Vibram Megagrip outsole with 5 mm lugs for grip in mud and technical terrain, and a snug Matryx upper. Built to eat up kilometres without punishing your legs in long races.
Altra
Altra Lone Peak 9
Trail running shoe with zero drop and wide FootShape toe box that allows natural toe splay. 25 mm stack with EGO foam for balanced cushioning without losing ground contact. MaxTrac outsole with 3.5 mm lugs, ideal for non-technical trails, forest tracks and long-distance paths.
New Balance
New Balance Fresh Foam X Hierro v9
The model breaking into Spain's best-seller charts. Fresh Foam X midsole with a solid balance between cushioning and ground feel, a Vibram Megagrip outsole, and a comfortable last suited to wide feet. A reliable all-rounder for training runs and mountain races of any distance.
Tips
- •Aggressive sole shoes: loose limestone and very steep channels
- •Poles essential for the elevation gains in this race
- •Headlamp mandatory for Ultra and Cainejo (6:00 AM start)
- •Waterproof windbreaker: weather in Picos changes in minutes
- •Gloves and thermal buff for the summits
Which shoes for Desafío Ultra El Cainejo?
Which footwear fits based on the race's terrain and weather
Which GPS watch for Desafío Ultra El Cainejo?
Which watch has the battery to last based on your estimated finish time
Best Trail Running Poles 2026: Comparison and Buying Guide
The best trail running poles in 2026, compared on technical criteria: Black Diamond Distance Carbon Z, Leki Ultratrail FX.One, Komperdell Carbon FXP Trail and Cascade Mountain Tech. Weight, folded length, aluminium vs carbon, technique and how to pick your size.
Best Trail Running Hydration Vests 2026: Comparison and Buying Guide
In-depth comparison of the best hydration vests and packs for trail running in 2026: Salomon ADV Skin 12 Set, Salomon Active Skin 8, CamelBak Octane, Compressport UltRun Vest, NNormal Race Vest, AONIJIE 10L and HANKER waist belt. Soft flasks vs reservoir, how many litres by distance, how to stop the vest bouncing and how much water to carry.
Best Value Trail and Mountain GPS Watches 2026: Comparison and Buying Guide
The best value-for-money trail and mountain GPS watches in 2026: Coros Pace 3, Amazfit T-Rex 3 and Cheetah Pro, Garmin Forerunner 165 and Suunto Race 2. How much a good trail watch costs, which ones have cheap offline maps, whether an Amazfit performs like a Garmin and which watch to buy for your budget. Figures verified against the manufacturer.
Nutrition for Desafío El Cainejo
NutritionStrategic aid stations along the route with solid food and drinks. The extreme vertical effort demands a solid nutrition plan.
Maurten
Maurten Gel 100
Gel de hidrogel con 25g de carbohidratos. La tecnología de hidrogel encapsula los carbohidratos para una absorción sin molestias gástricas. Sabor neutro, sin edulcorantes artificiales. Usado por corredores de élite en maratón y ultra.
Precision Fuel & Hydration
Precision Fuel & Hydration PH 1500
Pastillas efervescentes con 1500 mg de sodio por litro. Para corredores que sudan mucho o en condiciones de calor. Sin calorías ni carbohidratos, solo electrolitos. Ideales para combinar con geles o barritas.
GU
GU Energy Gel Original
Gel energético con 100 calorías y 21g de carbohidratos por sobre. Mezcla de maltodextrina y fructosa para absorción óptima. Incluye aminoácidos y electrolitos. El gel más usado en ultratrails de todo el mundo.
Gourmet Latino
Bocadillo de Guayaba Gourmet Latino
Natural guava bar in individual 26 g format. High in vitamin C and fast-absorbing carbohydrates. Solid texture with easy-open wrapper, perfect for carrying during races. Intense sweet flavor that delivers immediate energy without needing water.
Crown Sport Nutrition
Crown Sport Nutrition 3:1 Recovery+
Recuperador muscular a base de proteína de suero aislada (whey isolate) con ratio carbohidratos-proteína 3:1, enriquecido con L-Leucina y L-Glutamina. Certificado Informed Sport y sin alérgenos añadidos. Formato de 750 g, sabor sandía.
226ERS
226ERS Isotonic Drink
Bebida isotónica en polvo de la marca española 226ERS. Aporta carbohidratos, electrolitos y minerales para mantener la hidratación durante el ejercicio. Fórmula con amilopectina para absorción rápida sin molestias digestivas.
Victory Endurance
Victory Endurance Total Recovery
Preparado en polvo para bebida de recuperación post-entreno con carbohidratos, electrolitos y proteína en ratio BCAA 2:1:1. Incluye 12 vitaminas y 9 minerales para acelerar la recuperación muscular tras un trail largo. Formato de 1250 g, sabor sandía.
226ERS
226ERS Recovery Drink
Muscle recovery shake from Spanish brand 226ERS. Formula with whey protein, amylopectin, amino acids (including glutamine and BCAAs) and minerals. Carb-to-protein ratio optimised for the post-exercise window. Good taste and digestive tolerance.
Tips
- •The cumulative elevation drives calorie burn: eat from the start
- •Constant electrolytes: vertical effort causes major salt losses
- •Carry extra solid food: distances between aid stations can be long
- •No mobile coverage on most of the course: carry everything you need
How to get to Caín de Valdeón
TransportCaín de Valdeón is in the Valdeón Valley, northern León province. Access via mountain road.
Browse all transportTips
- •From León: 2h via the N-625 and LE-243
- •From Oviedo: 2h 30 min via the A-66 and N-625
- •From Santander: 2h 30 min via the A-67 and N-621
- •No direct public transport to Caín: a car is essential
- •The road to Caín is narrow and mountainous — drive carefully
Car rental for Caín de Valdeón
Car RentalRemote mountain area with no public transport. A car is necessary.
DRIVALIA
DRIVALIA Alquiler de vehículos por Suscripción CarCloud Country Plus
SUV/crossover vehicle rental subscription, ideal for reaching mountain races via rural roads and forest tracks.
DRIVALIA
DRIVALIA Alquiler de vehículos por Suscripción CarCloud City
Urban vehicle rental subscription, perfect for getting to races with good highway and conventional road access.
Carla
Carla Car Rental - Reserva ahora, paga después
Car rental comparison in over 180 countries with free cancellation. Book now and pay when you pick up the vehicle, no hidden fees or upfront card charges.
Hertz
Hertz - Alquiler de coches
Car rental with one of the world's most recognised brands, with offices at airports and cities across Spain.
Tips
- •Also available from Oviedo or Santander airports
- •Narrow mountain roads but well maintained
- •Limited parking in Caín: arrive early
Sports insurance for Desafío El Cainejo
InsuranceTechnical high mountain race with no mobile coverage. Insurance with rescue cover is essential.
Browse all insuranceTips
- •Civil liability insurance mandatory
- •Helicopter rescue cover highly recommended
- •Organisation includes volunteers, Civil Protection and GREIM mountain rescue
- •Nearest hospital in Potes or Cangas de Onís: considerable distance
Body care for Desafío El Cainejo
Body CareTechnical terrain with ropes, chains and rocky channels. Hands and feet take particular punishment.
After Bite
After Bite Xtra Gel
Soothing gel with 3.5% ammonia for immediate relief from skin irritations. Compact format (20 g) ideal for carrying in a trail running vest. Effective against processionary caterpillar urticating hairs, nettles and insect bites.
Buff
Buff CoolNet UV+
Multifunctional tubular with UPF 50+ UV protection and cooling technology. Can be worn as neck gaiter, headband, balaclava or wristband. CoolNet fabric reflects UV rays and cools the skin by evaporation.
Julbo
Julbo Aerospeed
Sport sunglasses with Reactiv photochromic lenses that automatically adapt to light conditions (category 1 to 3). Designed for trail running with non-slip temples and integrated ventilation.
OOFOS
OOFOS OOriginal Sport
Unisex recovery sandal with patented OOfoam technology, which absorbs 37% more impact than conventional EVA foam and reduces stress on feet, ankles and back after exertion. Closed thong-style toe post with built-in arch support in the footbed. Machine washable.
Therabody
Theragun Mini (2.ª generación)
Compact massage gun with QuietForce motor and 3 speeds (1750-2400 percussions/min). Weighs just 500g and fits in your race vest or bag. Ideal for self-massage of quads, calves and glutes after a trail.
Compex
Compex Ayre Recovery Boots
Pneumatic pressotherapy boots with 4 sequential air chambers. Dynamic compression that improves venous return and speeds up toxin elimination after mountain races. 3 pressure levels and 20-30 minute sessions. Built-in rechargeable battery.
Salomon
Salomon Mangas Running
Lightweight, breathable and absorbent running sleeves from Salomon, with a comfortable adaptable fit for variable mountain temperature conditions.
Salomon
Salomon Polaina Cuello Merino
Salomon merino wool neck gaiter. Natural warmth, breathable and odour-resistant even after several uses without washing, key for multi-day ultras. Versatile use in the mountains and premium trail running.
Tips
- •Vaseline or anti-chafing cream on feet, groin and armpits
- •Light gloves for rope and chain sections
- •Tape for blisters: technical terrain punishes your feet
- •Spare socks if it rains — wet feet cause blisters fast
Sun protection for Desafío El Cainejo
Sun ProtectionHigh mountain in May. Intense UV radiation at the summits even with cloud cover.
ISDIN
ISDIN Fotoprotector Fusion Water SPF 50+
Ultralight water-phase facial sunscreen with SPF 50+. Fluid texture that absorbs instantly with no greasy residue, ideal for applying during a race. Water and sweat resistant.
Piz Buin
Piz Buin Mountain SPF 50+
Mountain sunscreen with SPF 50+ formulated for extreme altitude conditions. Extra protection against intensified UV radiation and cold wind. Rich texture that protects skin from dehydration.
Sun Bum
Sun Bum Sunscreen Lip Balm SPF 30
Lip balm with SPF 30 sun protection in stick format. Moisturises and protects lips from sunburn, a spot many runners forget. Coconut flavour, paraben-free.
Cantabria Labs
Heliocare 360º Sport Transparent Stick SPF 50+
Transparent SPF 50+ sun stick, 25 g, with 360º protection (UVA, UVB, visible light and infrared). Goes on dry in seconds over face, ears, neck and bald scalp with no sticky hands and no white cast: the format built for reapplying at an aid station. High water and sweat resistance, from a Spanish pharmacy brand.
Columbia
Columbia Schooner Bank II Cachalot
Legionnaire-style cap with neck flap, ideal for long-duration races with intense sun exposure. Covers the neck and ears, two of the areas most prone to sunburn in the mountains.
Julbo
Julbo Aero
Sports sunglasses with a Reactiv photochromic lens that automatically adapts to changing light, an ultralight panoramic frame and the Air Link temple system for a secure, pressure-free fit. Built for high-mountain trail running, where light shifts constantly between forest, rock and open summits.
Buff
Buff Venture Gorra 5 Panel
Lightweight 5-panel cap with UPF 50+ protection, breathable fabric and comfortable fit. Ideal for summer trail running races where weight and ventilation are a priority.
d'Alba
d'Alba Air Fit Fresh Stick SPF 50+ PA++++
Facial SPF 50+ PA++++ sun stick, 19 g, Korean skincare, vegan and fragrance-free. Dry, powdery finish, not sticky, doesn't sting the eyes when you sweat: comfortable for daily training and shorter races. The lightest and cheapest option in the comparison.
Tips
- •SPF 50+ essential: UV radiation is 25% stronger at 2,000m
- •SPF lip balm to prevent sunburned lips
- •Apply before the start and carry a small bottle to reapply
- •Cap or visor recommended for exposed sections
Best Sunscreen for Runners 2026: 7 Sweat-Proof SPF 50 Picks
Which sunscreen survives a sweaty long run? We tested 7 SPF 50 sweat-proof picks — creams, sticks and a lip balm — against heat, altitude UV and hours of sweat. See the winner.
Frequently Asked Questions
- When is Desafío El Cainejo 2026?
- May 23-24, 2026. The Ultra 52K and Cainejo 35K start on Saturday May 23. The Cainejín 19K starts on Sunday May 24.
- What distances does Desafío El Cainejo offer?
- Three distances: Desafío Ultra 52K (5,500m D+), Cainejo 35K (3,200m D+) and Cainejín 19K (1,800m D+).
- Can you run the Ruta del Cares section?
- No. Running on the Ruta del Cares section is strictly prohibited. Time controls are in place and violations result in automatic disqualification.
- Is a medical certificate required?
- Yes, a medical fitness certificate must be uploaded to the registration platform. Without it, you won't be authorised to start.
- How much does registration cost?
- €104 for the Ultra 52K, €72 for the Cainejo 35K and €53 for the Cainejín 19K. Registration via 321go.es until May 18 or until spots run out.
Races similar to Desafío Ultra El Cainejo
View all similar races →
FeaturedGTPE Picos de Europa
Benia de Onís
5 distancias (70K a 10K) por el macizo occidental de Picos de Europa desde Benia de Onís
FeaturedPhoto: Ignacio Fernández Álvarez / UnsplashTravesera Picos de Europa
Potes
72K y 36K por los tres macizos de Picos de Europa, una de las ultras más duras de España
Riaño Trail Run
Riaño, León
Trail por etapas en la Montaña de Riaño — 3xTrail 84K / 2xTrail 47K / Open 42K entre Picos de Europa, Montaña Palentina y Mampodre