A remote highland hike to the Askja caldera, one of Iceland's most dramatic volcanic landscapes, containing the milky-blue Víti explosion crater beside the deep Öskjuvatn caldera lake. The approach requires crossing the Ódáðahraun lava desert via F-roads passable only in high summer with 4WD.
The Askja trek begins at the F88 road end in the Dyngjufjöll highlands, reached only by high-clearance 4WD crossing the Ódáðahraun lava desert, a route open roughly from late June to September depending on snowmelt and river conditions; a highland bus service also runs from Mývatn in peak summer. The 10 km round trip gains about 200m from the car park to the crater rim, following a well-marked gravel and volcanic ash path across the flat caldera floor before a short climb to the rim overlooking Víti, a milky turquoise explosion crater, and the adjacent Öskjuvatn, Iceland's deepest lake, formed after a major eruption in 1875. The terrain is exposed volcanic desert with no shade and frequent wind, and weather in the highlands can shift rapidly even in summer. Some hikers descend a steep path from the rim down to Víti's crater lake for a geothermally warmed swim, though the descent is loose and slippery with no railings. There are no mountain huts on this short route; the nearest shelter is a small warden hut and campsite at Drekagil near the car park, which also marks the only reliable water source. Given the remoteness, hikers should carry all supplies and check road and weather conditions at safetravel.is before setting out, since the F-road approach itself is a significant part of the undertaking.
| Distance | 10 km return |
|---|---|
| Duration | 4-5 hours |
| Difficulty | challenging |
| Trailhead | 4WD required |
| Best season | July-August |
| Address | F88 road end, Dyngjufjöll, North Highlands |
Trail facts
- Trail area
- Dyngjufjöll, North Highlands
What to bring
- hiking boots
- waterproof jacket
- warm layers
- sun protection
- offline GPS
Weather through the year in Iceland
Best time Shoulder Worth avoiding
Average daytime temperature in °C. Figures are for Iceland.
Location
F88 road end, Dyngjufjöll, North Highlands
65.0480, -16.7480 View on map
Highlights
- Víti geothermal crater lake
- Öskjuvatn caldera
- Highland desert scenery
- Remote wilderness atmosphere
Tips for visiting
- Check F-road conditions at road.is before departure; the F88 crosses unbridged rivers and is only open to well-equipped 4WD vehicles.
- The descent into Víti crater for a swim is steep and slippery with no railings; take care on the loose scree.
- Pack for sudden weather changes and strong winds, as there is no shelter across the exposed caldera floor.
- Fill up on water and fuel before leaving Mývatn or Egilsstaðir, as there are no services near Askja.
- A highland bus runs from Mývatn in peak summer for those without a suitable 4WD vehicle.
When to visit
Mid-July through August offers the most reliable F-road access and the best chance of calm weather at the crater rim.
Accessibility
The flat caldera floor near the car park is walkable on a gravel path, but the final approach to the crater rim and any descent to Víti crater is over loose, uneven volcanic ground and is not wheelchair- or stroller-accessible.
Frequently asked questions
How do hikers reach the Askja trailhead?
The F88 road requires a high-clearance 4WD vehicle to cross unbridged rivers and the Ódáðahraun lava desert, though a seasonal highland bus from Mývatn offers an alternative for those without a suitable vehicle.
Can hikers swim in Víti crater?
Yes, a steep and slippery path descends from the rim to the geothermally warmed water of Víti crater lake, though the descent has no railings and should be taken carefully.
When is the F88 road open?
The road typically opens from late June to September depending on snowmelt, and it closes again once autumn weather sets in, making Askja inaccessible outside this window.
Is the hike itself difficult?
The walk from the car park to the crater rim is relatively short and gentle, but the trek is classed as challenging overall because of the remote, difficult 4WD approach and exposed highland conditions.