Photo: Desafío Ultra El Cainejo (opens in a new tab)Caín de Valdeón, León
Desafío Ultra El Cainejo
Saturday, 22 May 2027estimated date
Desafío Ultra 52K
52km D+ 5500m
Cainejo 35K
35.7km D+ 3200m
Cainejín 19K
19.5km D+ 1800m
Your checklist for Desafío Ultra El Cainejo
What you need, category by category, with our #1 pick for this race. Tick what you already have.
0 of 11 ready
Swipe to see all 12 categories
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GPS watch
Done, you already have it
View on Amazon →(opens in a new tab)Suunto Run 2
Very light: 35 g case
Downside: 24 h of GPS: short for ultras over 100 km
Gear
Aggressive sole shoes: loose limestone and very steep channels
Done, you already have it
View on Amazon →(opens in a new tab)Salomon Speedcross 6
Exceptional grip in mud and technical terrain
Downside: Average durability on pavement
Nutrition
The cumulative elevation drives calorie burn: eat from the start
Done, you already have it
View on Amazon →(opens in a new tab)Maurten Gel 100
Hydrogel technology: excellent gastric tolerance
Downside: High price compared to other gels
Sun Protection
SPF 50+ essential: UV radiation is 25% stronger at 2,000m
Done, you already have it
View on Amazon →(opens in a new tab)ISDIN Fusion Water Sunscreen SPF 50+
Ultralight texture, feels invisible on skin
Downside: Small format (50 ml), may run short on ultras
Body Care
Vaseline or anti-chafing cream on feet, groin and armpits
Done, you already have it
View on Amazon →(opens in a new tab)After Bite Xtra Gel
Immediate relief from processionary caterpillar irritation
Downside: Strong ammonia smell
Car Rental
Also available from Oviedo or Santander airports
Done, you already have it
View on Amazon →(opens in a new tab)DRIVALIA CarCloud Country Plus
Mandatory
Waterproof jacket
Mandatory for all distances. Weather in Picos changes in minutes.
Done, you already have it
View on Amazon →(opens in a new tab)Gore Wear R7 GTX Shakedry
Mandatory
Headlamp
Mandatory for Ultra and Cainejo (6:00 AM start).
Done, you already have it
View on Amazon →(opens in a new tab)Petzl Actik Core
Mandatory
Emergency whistle
Mandatory. To call for help in an emergency.
Done, you already have it
View on Amazon →(opens in a new tab)Fox 40 Classic
Mandatory
Emergency blanket
Mandatory for all distances.
Done, you already have it
View on Amazon →(opens in a new tab)Lifesystems Thermal Blanket
Mandatory
Charged mobile phone
Mandatory with charged battery, although there is no coverage on most of the course.
Done, you already have it
View on Amazon →(opens in a new tab)Generic Running Waist Pack with Phone Pocket
Trip logistics
Registration, travel and insurance: what you should have sorted before race day.
Affiliate links: if you buy, we earn a commission at no extra cost to you.
Mandatory Gear
According to the official race regulations
Waterproof jacket
Mandatory for all distances. Weather in Picos changes in minutes.
Headlamp
Mandatory for Ultra and Cainejo (6:00 AM start).
Emergency whistle
Mandatory. To call for help in an emergency.
Emergency blanket
Mandatory for all distances.
Charged mobile phone
Mandatory with charged battery, although there is no coverage on most of the course.
Items tagged “Mandatory” are in the checklist above, with a recommended product.
Race data
Terrain
Mountain
Difficulty
Elite
Distance
3 modalities
Desafío Ultra 52K
Price: 104 EUR
- Distance
- 52 km
- Elevation Gain
- D+ 5500m
- Max Time
- 16h
- UTMB
100K
Cainejo 35K
Price: 72 EUR
- Distance
- 35.7 km
- Elevation Gain
- D+ 3200m
- Max Time
- 12h
- UTMB
50K
Cainejín 19K
Price: 53 EUR
- Distance
- 19.5 km
- Elevation Gain
- D+ 1800m
- Max Time
- 6h
- UTMB
20K
| 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 |
Will your watch battery last the ~19 h of Desafío Ultra El Cainejo?Worked out for the longest course (52 km). See which watches reach the finish with GPS on and which die on the way.Check my watch Check my watchDesafío Ultra El Cainejo requires mandatory gear: get it sorted early
Buying guides with the best value for money, picked for this kind of terrain.
Swipe to see all 4 comparisons
Historical weather
What to wear at 10 °C: guide and kit →
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.
Brooks
Brooks Cascadia 20 GTX
The Cascadia 20 with a GORE-TEX membrane: stability and protection for rocky mountain terrain, keeping the foot dry on cold, rainy days.
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
Ultralight Gore-Tex Shakedry waterproof jacket (110 g). Full waterproofing without an inner membrane, highly breathable. The benchmark for mountain runners.
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
Ultralight waterproof windproof jacket (135 g). Taped seams, adjustable hood and back ventilation. Packs into its own pocket.
Salomon
Salomon Speedcross 6 GTX
The Speedcross 6 with a GORE-TEX membrane: the same aggressive 5 mm lugs for mud and soft ground, now waterproof for winter, rain and snow.
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.
Shokz
Shokz OpenRun
Open-ear bone conduction headphones with IP67 rating: they take rain, mud and a rinse under the tap. Up to 8 h of battery and quick charge (10 min for 1.5 h). The most rugged pick of the range for training in bad weather.
TRIWONDER
TRIWONDER Waterproof Trail Gaiters
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
Thermal tubular Buff with Primaloft technology. Traps body heat, ultralight and versatile: hat, neck gaiter, headband. Ideal for high mountain.
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 Thermal Neck Gaiter
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
Long-sleeve thermal base layer made from recycled fabric with anti-odour treatment. Active thermal regulation, ideal as a base layer in the mountains.
Odlo
Odlo I-Thermic Women's Longsleeve
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.
ROCKBROS
ROCKBROS Thermal Windproof Balaclava
Thermal windproof balaclava covering head, ears, cheeks and neck. Designed for cycling and motorcycling, it works just as well on windy, freezing trail runs.
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
Long trail tights with stretchy, breathable fabric. Adjustable waist, zipped back pocket. Protection from cold and vegetation.
Salomon
Salomon Cross Warm Glove
Thermal running gloves with a non-slip palm and touchscreen fingertips. Light, warm and compatible with poles.
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.
Under Armour
Under Armour ColdGear Armour Compression Mock (Men's)
Men's high-neck thermal compression top: brushed interior that holds heat and a quick-dry outer. Base layer for cold-weather runs.
Forecast for 22 May
Weather forecast from Open-Meteo (may change until race day)
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.
360Complete Pack
Desafío El Cainejo 2026 Registration
RegistrationThree distances with registration through 321go.es. Limited spots and medical certificate required.
Tips
- •€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.
Tips
- •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.
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
Best trail running poles 2026: Black Diamond, Leki and Komperdell compared. Carbon vs aluminium, folding length, technique and how to pick your size.
Best Trail Running Hydration Vests 2026: Comparison and Buying Guide
Best trail running hydration vests 2026: 12 vests and packs compared. How many litres you need by distance, soft flasks vs reservoir, and fit.
Strength Training Gear for Trail Running at Home 2026: Comparison and Buying Guide
Comparison of the best strength training gear for trail runners at home: dumbbells, resistance bands, kettlebell, TRX, weight bench and foam roller, with a 3-day-a-week routine.
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.
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.
Tips
- •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.
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.
Tips
- •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.
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.
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 compared 7 SPF 50 sweat-proof picks — creams, sticks and a lip balm — on heat, altitude UV and sweat resistance. 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.
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