Iceland · Full-day hike

Fimmvörðuháls: Skógafoss to Þórsmörk

Everyone comes for Skógafoss. Keep walking and the day changes from lush waterfalls to snow, young lava and finally the green mountain sanctuary of Þórsmörk.

Skógafoss-area waterfall and green canyon at the start of the Fimmvörðuháls hike
Beyond the Overlook trail snapshot
Effort9/10
Views10/10
Distance12.4–13.7 mi
Gain~3,280 ft
Our time~9 hours
TypeOne way · shuttle

Skógafoss is only the beginning — but first, the stairs

Skógafoss is right beside the parking lot, which makes it easy to think you have already seen the main event. You have not. The first challenge is the long staircase beside the falls. There are a lot of stairs, and the climb is no joke.

Once you reach the top, keep following the Skógá River. The first several miles were one of our favorite stretches of hiking anywhere in Iceland: waterfall after waterfall, each with a different shape, canyon and backdrop.

Waterfall along the Skógá River above Skógafoss
The waterfalls keep coming once you leave the main Skógafoss viewpoint.
Changing green canyon scenery on the Fimmvörðuháls trail
The scenery changes constantly rather than feeling like the same waterfall repeated.
Not ready for the full crossing? Still climb the stairs and hike the waterfall section. Go for one to three hours—or simply as far as you want—then turn around. You get one of the best parts of the route without the nine-hour day or shuttle logistics.

Then the green disappears

After hours of lush canyon scenery, the trail climbs into snow and ice between Eyjafjallajökull and Mýrdalsjökull. It felt like stepping into a completely different trip.

Snow and ice on the high Fimmvörðuháls pass
A few hours after the green waterfall trail, the route becomes stark and snowy.

Walking across young lava

The landscape changes again as you cross lava from the 2010 Fimmvörðuháls eruption. When we hiked here in 2024, that lava was only about 14 years old. The fresh-looking black volcanic terrain made the route feel even more surreal.

Young lava from the 2010 Fimmvörðuháls eruption
Lava from the 2010 eruption.
Wide volcanic and glacial views from Fimmvörðuháls
The views open dramatically across the high pass.

Þórsmörk feels like a sanctuary

After snow, ice and black lava, Þórsmörk appears below you in layers of green ridges and deep valleys. Braided rivers thread across the valley floor, while rounded mountains rise in every direction. After the exposed terrain above, the descent feels sheltered, lush and almost impossibly green.

Green ridges and valleys of Þórsmörk at the end of Fimmvörðuháls
The descent into Þórsmörk was the final dramatic landscape change of the day.

Plan the shuttle before you start

This is a one-way hike. We arranged a bus from Básar in Þórsmörk back to Skógar. The logistics are more complicated than a normal out-and-back, so reserve or verify transportation before committing to the crossing.

At the bottom we had food and beers while waiting for the ride. After a nine-hour day, that was a very good ending.

Post-hike beer after finishing the Fimmvörðuháls crossing
A simple but excellent finish after a very big hiking day.
Worth it? Absolutely. This was one of our best Iceland hiking days because it felt like several completely different landscapes compressed into one route.
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