4.5
(1456)
13,514
hikers
507
hikes
Hiking around Alnsjøen offers diverse trails within the Lillomarka forest, part of the Oslomarka system in northern Oslo. The area is centered around Alnsjøen lake, which functions as a minor water reservoir. The terrain features dense woodlands and varied elevation, providing a classic forest hiking experience. Traces of 18th-century copper mining activities are also present in the landscape.
Last updated: April 28, 2026
4.0
(2)
6
hikers
6.54km
01:49
120m
120m
Easy hike. Great for any fitness level. Easily-accessible paths. Suitable for all skill levels.
5.0
(2)
63
hikers
8.27km
02:19
160m
160m
Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels.

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3
hikers
13.3km
03:43
260m
260m
Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels.
5
hikers
4.95km
01:24
90m
90m
Moderate hike. Great for any fitness level. Mostly accessible paths. Sure-footedness required.
5
hikers
7.96km
02:07
80m
80m
Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels.
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A soft, root-laced trail winding through tall pine woods, perfect for flowy runs, quiet hikes, or just soaking in the forest stillness.
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From the trail we benefit from a nice view over the Alungsjøen lake.
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This small dam overflow from the Alundsjøen lake creates a surprising and photogenic contrast in the landscape.
1
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Nice little stream running in the middle of the forest.
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There are over 500 hiking trails around Alnsjøen, offering a wide variety of options. Approximately half of these are rated as easy, with another significant portion being moderate, and a smaller number of more difficult routes for experienced hikers.
The terrain around Alnsjøen is characterized by dense woodlands within the Lillomarka forest, part of the larger Oslomarka system. You'll find varied elevation, offering a classic forest hiking experience with paths winding through trees and occasional views of the lake. Some areas also bear traces of 18th-century copper mining activities.
Yes, there are many easy loop trails. A popular option is the Hike around Alunsjøen, which is an easy 6.5 km route that circles the lake. This trail is generally accessible and takes about 1 hour 49 minutes to complete, making it ideal for a relaxed outing.
The lake itself, Alnsjøen, is a prominent natural attraction, serving as a forest lake. Hikers often enjoy views of the lake through the dense Lillomarka forest. While there aren't specific named viewpoints in the immediate vicinity, routes like the View of the Lake in Nordmarka loop from Grorud offer scenic perspectives of the water and surrounding woodlands.
Absolutely. Alnsjøen offers many family-friendly hiking opportunities, especially the easier routes that circle the lake. The generally accessible trails and the natural setting of the Lillomarka forest provide a pleasant environment for families to explore together. Remember to check the specific trail difficulty and length to match your family's capabilities.
Yes, the Lillomarka area, including Alnsjøen, is generally dog-friendly. Norway's 'allemannsretten' (right to roam) allows access to wilderness areas. However, it's always important to keep your dog on a leash, especially during nesting seasons or when near wildlife, and to clean up after them to preserve the natural environment for everyone.
Alnsjøen is beautiful year-round. Spring and summer offer lush greenery and pleasant temperatures, ideal for hiking. Autumn brings vibrant fall colors to the forest. In winter, the area transforms, with gates opened to allow access for prepared ski tracks across the frozen lake, offering a unique winter hiking experience. Always check local weather conditions before heading out.
Yes, due to Alnsjøen's function as an important minor water reservoir for the city of Oslo, activities like swimming and fishing are generally restricted to prevent contamination. It's best to respect these regulations to protect the city's drinking water source.
Alnsjøen is accessible via public transport from Oslo. Many routes, such as the Bispedalskollen – Sportstuen View loop from Grorud and View of the Lake in Nordmarka loop from Grorud, start from Grorud, which is well-connected by metro and bus services. Check local transport schedules for the most up-to-date information on reaching trailheads.
Yes, there are parking options available near various trailheads accessing the Alnsjøen area. For example, routes starting from Grorud or Kalbakken, like the Picnic Area with Grill loop from Kalbakken, typically have designated parking facilities nearby. It's advisable to check specific trailhead information for parking availability.
The Alnsjøen area is highly rated by the komoot community, with an average score of 4.6 stars from over 1,400 reviews. Hikers often praise the quiet woodlands, the diverse network of trails suitable for various fitness levels, and the serene beauty of the lake itself. Many appreciate the classic forest hiking experience within easy reach of Oslo.


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