A lush green oasis of birch forest and moss, surrounded by Eyjafjallajokull, Myrdalsjokull, and Tindfjallajokull
Named after Thor, the Norse god of thunder, Thorsmork is an anomaly in the Icelandic highlands. While most of the interior is barren volcanic desert, this valley is green, sheltered, and almost lush -- filled with birch forests, wildflowers, and moss-covered gorges. Three glaciers encircle it on all sides, creating a natural windbreak that gives the valley an almost mild microclimate by Icelandic standards.
That protection comes at a cost: getting here is one of the more complicated logistics challenges in Iceland. The only road, F249, requires crossing the Krossa river -- a glacial torrent that changes depth and course daily, sometimes hourly. Vehicles have been swept downstream. For most travelers, the highland bus or a super jeep tour is the honest recommendation over self-driving.
But the effort to reach Thorsmork pays off in ways few other Icelandic destinations can match. This is one of the country's premier hiking areas, the endpoint of the Laugavegur and Fimmvorduhals trails, and a place where you can genuinely feel the scale of Iceland's geological forces -- with the volcano that disrupted European air travel in 2010 looming directly overhead.
The Krossa river crossing on F249 is genuinely dangerous. Highland bus or super jeep access is strongly recommended for most visitors.
The must-do short hike. A 2.5 km trail climbs to a viewpoint with 360-degree panoramic views of all three surrounding glaciers, the braided river channels below, and the green valley itself. Allow 1.5-2 hours. Moderate difficulty with one steep section. This single viewpoint justifies the trip.
A 5 km round-trip walk into a narrow, moss-covered gorge that ends at a hidden waterfall. The canyon walls tower above you, draped in green. Parts require wading through a shallow stream -- waterproof boots essential. One of the most atmospheric walks in Iceland.
Thorsmork contains some of Iceland's largest remaining birch woodland -- descended from forests that once covered much of the island before settlement. Several easy trails wind through the trees, offering a green, sheltered experience unlike anything else in the highlands.
A more demanding 8 km loop (5-6 hours) that climbs higher into the mountains for glacier views and volcanic terrain. Best for experienced hikers with a full day.
Thorsmork is the southern endpoint of the 55 km Laugavegur Trail from Landmannalaugar and the northern start of the 25 km Fimmvorduhals Trail to Skogafoss. Many hikers spend an extra night here between the two trails.
Recommended for most travelers
Reykjavik Excursions and Trex operate daily summer services from BSI terminal. 4-5 hours, $76-100 one-way. The bus driver handles the Krossa crossing in a specially equipped vehicle. The safest and most practical option.
$200-400 per person
Multiple operators offer day trips or transfers. Midgard Adventure, based nearby in Hvolsvollur, specializes in Thorsmork access. Guided day trips include hiking.
Experienced drivers only
The Krossa river crossing is genuinely dangerous. You need a large, high-clearance 4WD (Land Cruiser class minimum), should cross in early morning when water is lowest, and must accept full financial responsibility for any water damage. Not recommended for most visitors.
Krossa River Warning: The crossing changes depth and course daily. Vehicles have been swept downstream. No rental insurance covers water damage. Water damage can cost over 10,000 euros plus towing fees up to 450,000 ISK (~$3,700).
Huts + campsite
Run by Ferdafelag Islands. Basic hut accommodation and a large campground. The most rustic option. Book huts through fi.is.
Huts, glamping, restaurant, sauna
The more comfortable option with a restaurant open to all visitors, sauna, and hot pool. Offers both hut rooms and glamping tents. Book through volcanohuts.com.
Huts + campsite, pub
On the east side of the valley near Eyjafjallajokull. Hut accommodation and campground with a small restaurant and pub. Book through utivist.is.
All three areas require sleeping bags. Advance booking is essential for huts in July-August.
Mid-July through late August offers the warmest temperatures, driest conditions (by Icelandic standards), and all trails fully accessible.
Late June can work but F249 may still be closed -- check road.is.
September brings fall color to the birch trees and far fewer visitors, but weather becomes less reliable and bus services wind down.
If you are not an experienced highland driver with the right vehicle, take the bus. This is the single most important piece of information about visiting Thorsmork.
The glacial shelter effect keeps conditions milder than surrounding areas, but rain and wind can still arrive quickly. Full waterproof layers are non-negotiable.
The Eyjafjallajokull eruption largely destroyed the Gigjokull glacial tongue. The landscape continues to change as glaciers retreat and new vegetation takes hold.
The restaurant at Volcano Huts is the only dining option and is open to all visitors. The hut shops sell basics but selection is limited.
25 km hike over the pass to Skogafoss, passing 26 waterfalls and the 2010 eruption craters.
55 km trek north to Landmannalaugar -- Iceland's most famous multi-day hike.
Iceland's most famous south coast waterfalls, within driving distance of the F249 turnoff.
The eruption story told by the farmer at Thorvaldseyri farm who lived through it.
Planning help
Quick answers with safety notes where it matters.