See the sections
The Senda del Oso is 40 km from Oviedo (45 min), 70 from Gijón (1 h) and 65-70 from Avilés (1 h). Every driving route converges on exit 9 of the A-63, at Trubia; there is also a bus from Oviedo in 55 minutes.
By David Pintado · 6 min read
From Oviedo
From Oviedo it is 40 km to Entrago and the trip takes around 45 minutes. It is the reference route to the Senda del Oso and you cannot go wrong: A-63 towards Grado, exit 9 for Trubia and the AS-228 up the valley following the river, the same road you will use wherever you come from.
The AS-228 strings the four access points together in this order: first Tuñón (km 22 of the greenway), then Proaza and Caranga, and 7 km further up, Entrago (km 0).
Where to stop depends on the plan: for the classic bike day drive up to Entrago, because the pick-up point is there (Polígono de Pradacón, Nave 1) and the 18 km of gentle descent to Buyera start from it; for a short walk to the bear enclosure, Proaza or Tuñón itself shorten the approach.
You have the detail of every starting point in the section guide and the bikes in bike rental.
| Starting point | Distance | Time | Roads |
|---|---|---|---|
| Oviedo | 40 km | 45 min | A-63 (exit 9) + AS-228 |
| Gijón | 70 km | 1 h | A-8 + A-66 + A-63 |
| Avilés | 65-70 km | ~1 h | A-66 + A-63 + AS-228 |
| León | 85 km | 1 h 15 | AP-66 + Ventana pass |
| Somiedo | 45 km | 50 min | AS-265 + San Lorenzo pass |
The last row has a twist: if you want to chain the greenway with bears in the wild, Somiedo is 45 km (50 min) from Entrago over the San Lorenzo pass. We cover it in bear watching in Somiedo.
By bike from Oviedo
There is a third way almost nobody considers and it works beautifully: pedalling. It is 34 km (2.5-3 hours) linking the Parque de Invierno, the Fuso greenway and the Nora corridor to Trubia, then the AS-228 to Tuñón. You reach the greenway without a car, without timetables and already warmed up.
From Gijón
From Gijón allow 70 km and a solid hour's drive, with the advantage that almost all of it is motorway: A-8, A-66 and A-63 to the same exit 9 at Trubia. Only the final stretch on the AS-228 is valley road.
The firm advice for summer: leave at 9 am. The greenway's free car parks add up to around 120 spaces (Entrago ~60, Tuñón ~40, Proaza ~20) and in July, August and on long weekends they fill up before 10 am; leaving Gijón at 9 you arrive with margin. The plan B for each access point is in the parking guide.
Is it doable as a day trip? Comfortably: 2 hours of driving in total and 2-3 hours of greenway by bike leave the afternoon free. And if you would rather sleep in the valley and stretch it out, we build it step by step in the weekend getaway.
From Avilés
From Avilés allow between 65 and 70 km to Entrago, around 1 hour's drive. There is no inland shortcut: the sensible route drops towards Oviedo on the A-66, joins the A-63 towards Grado without entering the city and leaves at Trubia via exit 9.
The maths, in parts: about 40 km of motorway from Avilés to Trubia and another 25 of AS-228 up the valley to Entrago, the stretch that sets the pace because it is gentle mountain road, with bends and village crossings.
If your plan starts at Tuñón, with the 10 km loop on foot or the section to Proaza, the trip drops to about 45 km and three quarters of an hour.
With that hour of driving, it pays to round off the day: the outdoor viewpoint of the Fernanchín enclosure (km 19, free and right on the greenway) and the Bear House of Proaza complete the visit. Enclosure times are managed by the Fundación Oso de Asturias, so check them before setting out.
Wherever you come from, the funnel is the same: exit 9 of the A-63 at Trubia and the AS-228 up the valley. Memorise that and one figure: in July, August and on long weekends, parked before 10 am.
By public transport
By public transport, the practical option is the bus: the Oviedo–San Martín de Teverga line covers the valley in around 55 minutes and stops at the four access points, Tuñón, Proaza, Caranga and Entrago. It is the only line that reaches the greenway, so from Gijón or Avilés you first need to get to Oviedo's bus station.
Timetables change by season and we do not copy them here so they cannot go stale: check them the day before in the journey planner of the Asturias Transport Consortium, which groups all the valley's lines.
The train, let's be honest, does not solve the trip: the nearest station is Trubia and it is 25 km from Entrago. It only makes sense as part of a combination, train to Trubia and from there a bike along the AS-228 to Tuñón, or as backup if someone picks you up en route.
The bus also has a tactical use few people exploit: it turns the greenway into a one-way route without needing two cars.
Leave yours at Tuñón, take the bus up to Entrago and walk down the full 22 km (5-6 hours) or the 18 to Buyera (4-5 hours), always with the 1.5% gradient in your favour. The times per section are worked out in how long it takes.
Getting-there FAQ
45 minutes by car for 40 km: A-63 towards Grado, exit 9 at Trubia and the AS-228 up the valley. By bus, the Oviedo–San Martín de Teverga line takes around 55 minutes to Entrago.
Yes, from Oviedo: the Oviedo–San Martín de Teverga line stops in Tuñón, Proaza, Caranga and Entrago in around 55 minutes. Timetables change by season; confirm them with the Asturias Transport Consortium.
There is no station on the greenway itself. The nearest is Trubia, 25 km from Entrago, so the train only makes sense combined with the valley bus or with a bike ride along the Nora corridor.
Between 65 and 70 km to Entrago, around 1 hour: A-66 towards Oviedo, A-63 towards Grado without entering the city, exit 9 at Trubia and the AS-228. If you start at Tuñón, it drops to about 45 km.
There are around 120 free spaces split between Entrago (~60), Tuñón (~40) and Proaza (~20). In July, August and on long weekends they fill up before 10 am: arrive early or head straight for Entrago, the largest.
Ruta del Oso