Photo: Club Pinineo Sport (opens in a new tab)Mieres
Backyard Baltasara
Saturday, 11 September 2027estimated date
Backyard loop (6.7 km/h)
6.7km D+ 250m
Backyard ultra format
Complete format guide: rules, gear and strategy
Race data
Terrain
Trail
Difficulty
Elite
Distance
1 modalities
Backyard loop (6.7 km/h)
Price: 50 EUR
- Distance
- 6.7 km
- Elevation Gain
- D+ 250m
- Max Time
- 1h
| Modality | Distance | Elevation Gain | Max Time | Price |
|---|---|---|---|---|
| Backyard loop (6.7 km/h) | 6.7 km | D+ 250m | 1h | 50 EUR |
Will your watch battery last the ~1 h of Backyard Baltasara?Worked out for the longest course (6.7 km). See which watches reach the finish with GPS on and which die on the way.Check my watch Check my watchYour checklist for Backyard Baltasara
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
A headlamp is essential for the night laps
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
Prepare solid food in addition to gels: backyard races are won by managing energy well
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
Reapply sunscreen during the midday laps
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
Apply anti-chafe balm before starting and check your feet between laps
Done, you already have it
View on Amazon →(opens in a new tab)
Compeed Ampollas Medianas Duplo
Instant pain relief on application
Downside: Medium size may not cover large blisters
Car Rental
Pick up your car in Oviedo, just 20 minutes from Mieres
Done, you already have it
View on Amazon →(opens in a new tab)
DRIVALIA Alquiler de vehículos por Suscripción CarCloud City
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.
Backyard Baltasara 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
14°C – 23°C
Average 18°C
Rain
37%
2.6 mm avg
Wind
11 km/h
max. average
Sunshine hours
9h
daily average
Gear recommendations
Bring a waterproof jacket (37% 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
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.
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.
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.
Sun protection essential (9h sunshine, up to 23°C)
Forecast for 11 September
Weather forecast from Open-Meteo (may change until race day)
Backyard Baltasara
Backyard Baltasara is an endurance race in backyard ultra format held every September in Mieres, organized by Club Pinineo Sport. The event follows the format popularized by backyard ultras: 6.7 km loops, one every hour on the hour, until only one runner remains capable of completing another lap.
A format with no predetermined end
The challenge has no fixed distance or duration. Each runner must complete the 6.7 km loop on the slopes overlooking Mieres, show up at the start line at the beginning of each hour, and repeat the process. Anyone who doesn’t arrive in time or decides to withdraw is out; whoever completes more laps than the rest of the participants wins the edition.
La Baltasara, above Mieres
The course runs around La Baltasara, on the slopes overlooking the town of Mieres, starting from Plaza Pasera. The mountain terrain repeats on every lap, which demands careful pacing from the start to avoid compromising the final hours.
Beyond the race in Mieres
Mieres is a town in central Asturias with a strong mining tradition, today reconverted into a hub with good services and proximity to Oviedo. After the event, discover other endurance and mountain races in the Asturias region or check the race planner to organize your visit.
Mandatory Gear
According to the official race regulations
Mandatory for the night laps, fully charged
Mandatory at aid stations
Fully charged
360Complete Pack
Backyard Baltasara 2026 Registration
RegistrationOrganized by Club Pinineo Sport. Registration open from June 4 to September 1, 2026, €50.
Tips
- •Limited spots: the backyard format usually has reduced capacity
- •Includes aid at the transition area between laps and timing
Where to stay in Mieres
AccommodationMieres has hotel options for staying overnight before or during the event, which can stretch for many hours.
Tips
- •Book lodging for supporters: the event can run all night
- •Mieres is 20 minutes from Oviedo if you prefer more lodging options
Gear for Backyard Baltasara
GearEndurance format with night and day laps on the slopes of La Baltasara, above Mieres.
Tips
- •A headlamp is essential for the night laps
- •Change of clothes and layers for the cold in the transition area
- •Shoes with good grip: the loop is repeated many times on the same terrain
Which shoes for Backyard Baltasara?
Which footwear fits based on the race's terrain and weather
Which GPS watch for Backyard Baltasara?
Which watch has the battery to last based on your estimated finish time
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.
Best GPS Watches with Offline Maps 2026: Value Comparison
The best GPS watches with offline maps in 2026, ranked by value: Amazfit T-Rex 3, Suunto Race 2, Garmin Forerunner 570, Instinct 3 AMOLED, Coros Apex 2 Pro, Suunto Vertical 2 and Garmin Fenix 8. Maps vs breadcrumbs, the cheapest watch with maps and which to choose for your use.
Nutrition for Backyard Baltasara
NutritionThe challenge has an indefinite duration, so nutrition strategy is key to holding out for as many laps as possible.
Tips
- •Prepare solid food in addition to gels: backyard races are won by managing energy well
- •Use every hour between laps to eat and drink
Best salt tablets and sodium capsules for running 2026
A comparison of the 7 best salt tablets and sodium capsules for running and trail 2026: 226ERS Sub9 Salts, Crown Pro Salt Caps, Victory Endurance, Precision Hydration PH 1500 and more. How many salt tablets to take per hour, how to calculate your sweat rate and which format to choose.
How to get to Mieres
TransportMieres is in central Asturias, well connected by road and train.
Tips
- •About 20 minutes from Oviedo via the A-66
- •Mieres has a train station on the Oviedo-León line
Car rental for Backyard Baltasara
Car RentalUseful for supporters who want to get around during the event's long hours.
Tips
- •Pick up your car in Oviedo, just 20 minutes from Mieres
Sports insurance for Backyard Baltasara
InsuranceValid insurance is required to participate.
Tips
- •A mountain federation license or a day insurance policy is mandatory
Sun protection for Backyard Baltasara
Sun ProtectionDaytime laps expose runners to the sun during the central hours of the event.
Tips
- •Reapply sunscreen during the midday laps
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 Backyard Baltasara
Body CareThe constant repetitions on the same terrain increase the risk of chafing and blisters.
Tips
- •Apply anti-chafe balm before starting and check your feet between laps
Frequently Asked Questions
- When does Backyard Baltasara 2026 take place?
- The weekend of September 12-13, 2026, starting from Plaza Pasera in Mieres. The race continues until only one runner remains.
- What is a backyard ultra race?
- A format where runners complete a fixed-distance loop (here 6.7 km) every hour on the hour. Anyone who doesn't finish in time or can't continue is eliminated; whoever completes more laps than everyone else wins.
- How long does Backyard Baltasara last?
- It has no fixed duration: it continues until only one runner remains capable of completing another lap within the hour limit.
- How do I get to Mieres?
- Mieres is about 20 minutes from Oviedo via the A-66, in central Asturias.
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