Backyard ultra format
Complete format guide: rules, gear and strategy
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Sep 12, 2026 · Closing soon
Registration
Prices, deadlines and direct registration link
Local guides
Race data
| Modality | Distance | Elevation Gain | ITRA | Max Time | Price |
|---|---|---|---|---|---|
| Backyard loop (6.7 km/h) | 6.7 km | D+ 250m | - | 1h | 50 EUR |
What you need
Salomon
Salomon Speedcross 6
Maurten
Maurten Gel 100
DRIVALIA
DRIVALIA Alquiler de vehículos por Suscripción CarCloud City
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
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.
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 WP
Chaqueta cortavientos impermeable ultraligera (135 g). Costuras selladas, capucha ajustable y ventilación trasera. Se pliega en su propio bolsillo.
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 September 12
Real-time data from Open-Meteo
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
360Complete Pack
Backyard Baltasara 2026 Registration
InscripciónOrganized by Club Pinineo Sport. Registration open from June 4 to September 1, 2026, €50.
Browse all inscripciónTips
- •Limited spots: the backyard format usually has reduced capacity
- •Includes aid at the transition area between laps and timing
Where to stay in Mieres
AlojamientoMieres has hotel options for staying overnight before or during the event, which can stretch for many hours.
Browse all alojamientoTips
- •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
MaterialEndurance format with night and day laps on the slopes of La Baltasara, above Mieres.
Salomon
Salomon Speedcross 6
La zapatilla de trail más versátil de Salomon, ideal para terrenos técnicos y barro. Agarre excepcional con suela Contagrip y amortiguación EnergyCell+.
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.
Salomon
Salomon ADV Skin 12
Chaleco de hidratación de 12 litros con sistema SensiFit. Dos soft flasks frontales de 500 ml incluidas. Bolsillos de fácil acceso y ajuste ceñido sin rebotes.
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
Nutrition for Backyard Baltasara
NutriciónThe challenge has an indefinite duration, so nutrition strategy is key to holding out for as many laps as possible.
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.
226ERS
226ERS Recovery Drink
Batido de recuperación muscular de la marca española 226ERS. Fórmula con proteína de suero, amilopectina, aminoácidos (incluyendo glutamina y BCAA) y minerales. Ratio carbohidratos-proteína optimizado para la ventana post-ejercicio. Buen sabor y tolerancia digestiva.
Dorimed
Dátiles Medjool Dorimed
Dátiles Medjool de Palestina, grandes y jugosos. Cada unidad aporta unos 18 g de carbohidratos en un formato muy compacto. Textura blanda, fácil de masticar y con una densidad calórica altísima. El clásico entre los corredores que buscan alternativas naturales a los geles.
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
How to get to Mieres
TransporteMieres is in central Asturias, well connected by road and train.
Browse all transporteTips
- •About 20 minutes from Oviedo via the A-66
- •Mieres has a train station on the Oviedo-León line
Car rental for Backyard Baltasara
Alquiler de vehículoUseful for supporters who want to get around during the event's long hours.
Browse all alquiler de vehículoTips
- •Pick up your car in Oviedo, just 20 minutes from Mieres
Sports insurance for Backyard Baltasara
SeguroValid insurance is required to participate.
Browse all seguroTips
- •A mountain federation license or a day insurance policy is mandatory
Sun protection for Backyard Baltasara
Protección solarDaytime laps expose runners to the sun during the central hours of the event.
ISDIN
ISDIN Fotoprotector Fusion Water SPF 50+
Protector solar facial ultraligero de fase acuosa con SPF 50+. Textura fluida que se absorbe al instante sin dejar residuo graso, ideal para aplicar durante la carrera. Resistente al agua y al sudor.
Sun Bum
Sun Bum Sunscreen Lip Balm SPF 30
Bálsamo labial con protección solar SPF 30 en formato stick. Hidrata y protege los labios de quemaduras solares, un punto que muchos corredores olvidan. Sabor a coco, sin parabenos.
Tips
- •Reapply sunscreen during the midday laps
Body care for Backyard Baltasara
Cuidado corporalThe constant repetitions on the same terrain increase the risk of chafing and blisters.
Compeed
Compeed Ampollas Medianas Duplo
Apósitos hidrocoloides para ampollas medianas. Alivio inmediato del dolor, protegen la ampolla mientras se cura y se mantienen en su sitio durante horas incluso con sudor. Pack de 10 unidades en envases individuales, ideal para llevar en la mochila de trail.
BodyGlide
BodyGlide Original Anti-Chafe Balm
Bálsamo anti-rozaduras en formato stick. Crea una barrera invisible sobre la piel que reduce la fricción sin obstruir los poros. Resistente al sudor, ideal para zonas críticas como ingles, axilas y pezones en carreras largas.
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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