Photo: Zarateman, CC BY-SA 3.0 (Wikimedia Commons) (opens in a new tab)Cangas de Onís
XtremeLagos
Saturday, 8 May 2027
Race data
Terrain
Mountain
Difficulty
Advanced
Distance
3 modalities
Maratón XtremeLagos
- Distance
- 42 km
- Elevation Gain
- D+ 6000m
- Max Time
- 10h
TrailXtreme
- Distance
- 14 km
- Elevation Gain
- D+ 2000m
- Max Time
- 6h
PequeXtreme
- Distance
- 4 km
- Elevation Gain
- D+ 300m
- Max Time
- -
| Modality | Distance | Elevation Gain | Max Time | Price |
|---|---|---|---|---|
| Maratón XtremeLagos | 42 km | D+ 6000m | 10h | - |
| TrailXtreme | 14 km | D+ 2000m | 6h | - |
| PequeXtreme | 4 km | D+ 300m | - | - |
Will your watch battery last the ~20 h of XtremeLagos?Worked out for the longest course (42 km). See which watches reach the finish with GPS on and which die on the way.Check my watch Check my watchYour checklist for XtremeLagos
What you need, category by category, with our #1 pick for this race. Tick what you already have.
0 of 6 ready
GPS watch
Done, you already have it
View on Amazon →(opens in a new tab)Garmin Instinct 3 AMOLED 45 mm
Onboard topo maps, unlike the Instinct 3 Solar
Downside: Shorter battery life than the Instinct 3 Solar (no solar charging or MIP display)
Gear
Hooded windproof jacket and thermal blanket are mandatory
Done, you already have it
View on Amazon →(opens in a new tab)
Nike Ultrafly
ZoomX foam: exceptional energy return inherited from the Vaporfly
Downside: High price (190 EUR)
Nutrition
Alternate gels with solid food on long climbs
Done, you already have it
View on Amazon →(opens in a new tab)
Maurten Gel 100
Tecnología de hidrogel: excelente tolerancia gástrica
Downside: Precio elevado respecto a otros geles
Sun Protection
Sweat-resistant SPF50 and lip balm
Done, you already have it
View on Amazon →(opens in a new tab)
ISDIN Fotoprotector Fusion Water SPF 50+
Ultralight texture, feels invisible on skin
Downside: Small format (50 ml), may run short on ultras
Body Care
Anti-chafe lubricant and blister patches before the start
Done, you already have it
View on Amazon →(opens in a new tab)
Julbo Aerospeed
Photochromic lenses: adapt from forest to summits
Downside: Higher price compared to non-photochromic glasses
Car Rental
Pick it up at Asturias airport or in Oviedo
Done, you already have it
View on Amazon →(opens in a new tab)
DRIVALIA Alquiler de vehículos por Suscripción CarCloud Country Plus
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.
XtremeLagos 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 15 °C: guide and kit →
Typical weather for the race date (10-year average)
Temperature
10°C – 19°C
Average 15°C
Rain
27%
1.8 mm avg
Wind
12 km/h
max. average
Sunshine hours
12h
daily average
Forecast for 8 May
Weather forecast from Open-Meteo (may change until race day)
XtremeLagos
XtremeLagos is one of the best-known mountain races in eastern Asturias. In 2027 the marathon reaches its 19th edition, organized by Grupo de Montaña Peña Santa with the support of Cangas de Onís town council, and brings together three events on Saturday 8 May: the Marathon, the TrailXtreme and the kids’ PequeXtreme.
A demanding mountain course
The Marathon XtremeLagos (42 km, 6,000 m D+) starts at 08:00 from El Repelao in Covadonga and finishes in Cangas de Onís. The time limit is 10 hours, with an intermediate checkpoint at 6 h 15 min. That is serious climbing for the distance, so train long ascents and technical descents.
The TrailXtreme (14 km, about 2,000 m D+ according to the organizer) starts at 10:00 from Plaza de La Estrella in Cangas de Onís and passes places such as Vega Oñañes. Its time limit is 6 hours. The PequeXtreme (4 km) introduces younger runners to the mountains.
Gear and logistics
The rules require a hooded long-sleeve windproof jacket, a thermal blanket, a mobile phone and a liquid container. In May the weather in the Picos de Europa can change fast, so pack layers.
Cangas de Onís beyond the race
Cangas de Onís was the first capital of the Kingdom of Asturias and is the gateway to Covadonga and the Lakes. Visit the Roman Bridge and try the local cider. Discover more races in Asturias and plan your season with the race planner.
Mandatory Gear
According to the official race regulations
Mandatory for the marathon and TrailXtreme
1.20 x 2.10 m
With charged battery
Minimum 500 ml in the marathon
For aid stations (marathon)
360Complete Pack
XtremeLagos 2027 registration
RegistrationRegistration is handled through the official XtremeLagos website. The event is organized by Grupo de Montaña Peña Santa with Cangas de Onís town council.
Tips
- •Choose Marathon, TrailXtreme or the kids' PequeXtreme according to your level
- •Check deadlines and the rules on the official website before signing up
Where to stay in Cangas de Onís
AccommodationCangas de Onís is the natural base: the TrailXtreme start and the finish are in town, and Covadonga is about 10 km away.
Tips
- •Book early: May is tourist season in the Picos de Europa
- •Staying in Cangas de Onís keeps you close to the finish and to services
Gear for XtremeLagos
GearA mountain marathon with 6,000 m D+ calls for grippy shoes, poles and the mandatory windproof jacket.
Tips
- •Hooded windproof jacket and thermal blanket are mandatory
- •Poles are very useful on the marathon climbs
Which shoes for XtremeLagos?
Which footwear fits based on the race's terrain and weather
Which GPS watch for XtremeLagos?
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 XtremeLagos
NutritionWith up to 10 hours of effort in the marathon, plan gels, salts and solid food on top of the aid stations.
Tips
- •Alternate gels with solid food on long climbs
- •Add salts if the day is warm
Getting to Cangas de Onís
TransportCangas de Onís is in eastern Asturias, well connected by road to Oviedo, Gijón and Asturias airport.
Tips
- •From Oviedo, take the A-8 and N-634 to Cangas de Onís
- •The marathon starts in Covadonga: confirm start access with the organizer
Car rental for XtremeLagos
Car RentalA car makes it easy to reach Cangas de Onís and get around Covadonga and the Picos de Europa.
Tips
- •Pick it up at Asturias airport or in Oviedo
Sports insurance for XtremeLagos
InsuranceCheck the official rules for the insurance or licence required to start.
Tips
- •Federation licence or day insurance, as per the rules
Sun protection for XtremeLagos
Sun ProtectionThere is no shade on the high sections and radiation at altitude is strong, even under cloud.
Tips
- •Sweat-resistant SPF50 and lip balm
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.
Body care for XtremeLagos
Body CareMany hours of descending and mud promote chafing and blisters.
Tips
- •Anti-chafe lubricant and blister patches before the start
- •Recover with a foam roller after the marathon
Frequently Asked Questions
- When is XtremeLagos 2027?
- Saturday 8 May 2027, according to the official website. The marathon starts at 08:00 and the TrailXtreme at 10:00.
- What distances does XtremeLagos offer?
- Marathon XtremeLagos (42 km, 6,000 m D+), TrailXtreme (14 km, about 2,000 m D+ per the organizer) and a kids' PequeXtreme (4 km).
- Where do the races start?
- The marathon starts at El Repelao (Covadonga); the TrailXtreme and PequeXtreme start at Plaza de La Estrella in Cangas de Onís.
- What are the time limits?
- 10 hours for the marathon (intermediate checkpoint at 6 h 15 min) and 6 hours for the TrailXtreme.
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