4.4
(82)
3,778
riders
52
rides
Road cycling around Arratzu offers diverse landscapes within the Urdaibai Biosphere Reserve, a UNESCO-designated area. The region features a continuous mix of climbs, descents, and undulating roads, characteristic of the Basque Country's hilly terrain. Cyclists will encounter narrow valleys carved by rivers, extensive oak groves, and views over dynamic marshlands. This varied topography provides engaging routes for different fitness levels.
Last updated: May 16, 2026
4.8
(12)
166
riders
33.0km
01:41
550m
550m
Cycle 20.5 miles (33.0 km) through the Urdaibai Biosphere Reserve from Guernica to Elantxobe, featuring moderate difficulty and coastal view
38
riders
63.3km
03:28
1,250m
1,250m
Cycle the Monte Oiz and Balcón de Bizkaia Loop, a difficult 39.4-mile road cycling route with 4096 feet of elevation gain.

Sign up for free
15
riders
68.4km
03:48
1,460m
1,460m
Hard road ride. Very good fitness required. Mostly well-paved surfaces and easy to ride.
3.7
(3)
362
riders
71.6km
03:29
840m
840m
Moderate road ride. Good fitness required. Some segments of this route may be unpaved and difficult to ride.
5.0
(1)
184
riders
95.9km
04:47
1,500m
1,500m
Hard road ride. Very good fitness required. Mostly well-paved surfaces and easy to ride.
Get access to more routes and recommendations from other explorers.
Sign up for free
Already have an account?
Our route recommendations are based on thousands of hikes, rides, and runs completed by other people on komoot.
Start today with a free account
Your next adventure awaits.
Login or Signup
The castle is gigantic and beautiful to look at, unfortunately it has been surrounded by a construction fence for ages. Unfortunately, you can't see much. Whether the detour is worth it, everyone has to decide for themselves.
0
0
Recreation of Picasso's famous painting. The original can be seen in Madrid.
1
0
Definitely a highlight, but unfortunately, the castle was covered in scaffolding when I visited. The castle dates back to the Middle Ages but was later almost completely rebuilt.
0
0
Good port and fast descent. Very good climb.
1
0
That is NOT A FOREST! It is a single plantation of eucalyptus. In reality it is a disaster painted green, green as hell.
0
0
Cool castle, graceful as it stands there. By the way, a really beautiful hiking area.
3
0
Wall reproduction of Picasso's painting "Guernica" exhibited at the Reina Sofía Museum in Paris.
0
0
There are over 50 road cycling routes around Arratzu, offering a diverse range of experiences. You'll find options for various skill levels, including 3 easy routes, 26 moderate routes, and 26 challenging routes, all set within the beautiful Urdaibai Biosphere Reserve.
Road cycling in Arratzu, located within the Urdaibai Biosphere Reserve, is characterized by a continuous mix of climbs, descents, and undulating roads. You'll encounter hilly and mountainous terrain, narrow valleys carved by rivers like the Golako, and scenic views over dynamic marshlands and extensive oak groves. This varied topography provides an engaging challenge for cyclists.
Yes, Arratzu offers numerous challenging routes for experienced road cyclists. For instance, the Monte Oiz and Balcón de Bizkaia Loop is a difficult 39.4-mile (63.3 km) path featuring significant climbs to panoramic viewpoints. Another demanding option is the La Tejería de Murueta, Paresi, Garaioltza and return to Gernika — circular by the Río Oca, a 42.5-mile (68.4 km) route with substantial elevation gain.
The routes around Arratzu offer stunning natural beauty and historical landmarks. You can enjoy views over the Urdaibai marsh, explore the ancient Arratzu Oak Grove, or cycle past the scenic Golako River. Historically significant sites include the Monastery of Santa María de Zenarruza, an ancient collegiate church on the Coastal Way of St. James, and the beautiful 16th-century Artzubi Bridge.
The Basque Country, including Arratzu, generally offers good cycling conditions from spring through autumn. The mild Atlantic climate means that while summers are pleasant, spring and early autumn provide comfortable temperatures and lush landscapes, ideal for tackling the region's varied terrain. Winter cycling is possible, but be prepared for cooler, potentially wetter weather.
While Arratzu's terrain is generally hilly, there are a few easier routes suitable for families or those seeking a less strenuous ride. Additionally, the presence of 'bidegorris' (cycle paths) connecting Arratzu's neighborhoods to nearby towns like Gernika-Lumo can offer safer, flatter sections for family cycling. Look for routes categorized as 'easy' in the komoot guide.
The road cycling experience in Arratzu is highly rated by the komoot community, with an average score of 4.7 stars from over 100 reviews. Cyclists often praise the region's diverse landscapes within the Urdaibai Biosphere Reserve, the engaging mix of climbs and descents, and the opportunity to discover both natural beauty and historical sites.
Yes, many of the road cycling routes around Arratzu are designed as loops, allowing you to start and finish at the same point. An example is the Ascent to Olabarri, Rigoitia – Butrón Castle loop from Gernika, which offers a moderate 43.6-mile (70.2 km) circular journey through the region's varied landscapes.
Absolutely. The region is rich in scenic viewpoints. You can find breathtaking vistas such as the Views over the Urdaibai marsh, offering dynamic expanses of water and sand. Other notable spots include the View from San Pedro de Atxarre and Talaia (276 m), both providing elevated perspectives of the surrounding natural beauty.
Yes, several routes offer a blend of cycling and cultural exploration. The Monastery of Santa María de Zenarruza, a National Monument and a significant point on the Coastal Way of St. James, is accessible via ancient pilgrim roads. Additionally, the Artzubi Bridge, a beautiful 16th-century Romanesque structure, is also part of the Camino de Santiago route, connecting Arratzu and Mendata.
One of the longer and more challenging road cycling routes in the area is the Lekeitio Old Town and Basilica – View of Laga Beach loop from Institutua. This difficult route covers approximately 59.6 miles (95.9 km) and includes significant elevation changes, offering a comprehensive tour of the coastal and inland landscapes.
Yes, the region offers unique natural attractions. While technically in nearby Kortezubi, the Oma Forest, also known as the Painted Forest of Oma, is an accessible and unique artistic intervention on pine trees within the broader Urdaibai area, blending art with nature. This could be a fascinating stop during a ride.


Browse the best Road cycling routes in other regions.