Iceland's F-Roads: What You Must Know Before Driving the Highlands

What Are F-Roads and Why They Demand Respect

Iceland's highland interior is one of the most dramatic landscapes on earth — and one of the most dangerous for unprepared drivers. F-roads (marked with an "F" prefix, such as F35 Kjalvegur or F26 Sprengisandur) are the rough mountain tracks that cross Iceland's uninhabited interior. They are officially classified as roads only in the loosest sense: they are unmaintained gravel and boulder tracks, frequently intersected by unbridged glacial rivers, subject to sudden closures, and accessible only in high-clearance 4WD vehicles.

Every year, rental car companies pursue tourists in regular 2WD vehicles for tens of thousands of euros in repair costs — and occasionally for recovery fees after drivers get stranded in the highland desert with no mobile signal and no help for hours or days. This guide tells you exactly what you need to know before considering any F-road drive.

The Legal Requirements: 4WD Is Non-Negotiable

Driving an F-road in a 2WD vehicle — including any standard car, most SUVs marketed as "crossovers," and any vehicle without genuine four-wheel drive engagement — is both illegal and covered by a specific exclusion in virtually every Icelandic car rental contract. Insurance is voided the moment a 2WD vehicle enters an F-road. Recovery in the highlands costs between 500,000 and 2,000,000 ISK depending on location and complexity.

Vehicles appropriate for F-roads include:

• Full-size 4WD SUVs with high ground clearance and genuine off-road 4x4 systems: Toyota Land Cruiser, Ford Bronco, Jeep Wrangler, Land Rover Defender
• Modified Super-Jeeps with 35–44 inch tires and lifted suspensions — used by Icelandic highland tour operators
• Smaller 4WD crossovers (Dacia Duster 4WD, Subaru XV, Toyota RAV4) can manage some of the easier F-roads (e.g. F35) but are not appropriate for river crossings or the most remote routes

River Crossings: The Most Dangerous Part

Many F-roads include mandatory river crossings — fording glacial rivers with no bridge. These crossings are the primary cause of vehicle damage and driver fatalities in the Icelandic highlands. Glacier meltwater rivers change depth, flow speed, and location daily depending on temperature. A crossing that was 40 cm deep at 9am may be 90 cm deep at 3pm after a warm afternoon.

Rules for river crossings:

• Always walk the crossing first on foot before driving through
• Cross diagonally at an angle, heading downstream as you move forward
• Never cross alone — always travel in a convoy of at least two vehicles
• If in doubt, do not cross. The river will not get safer by waiting — but it might get worse. Turn around.
• Never open the door mid-crossing; water pressure can trap you inside or flood the vehicle instantly

When F-Roads Are Open: Seasonal Access

F-roads are closed throughout winter and typically only open between late June and early September, depending on snowmelt. The Icelandic Road Administration (Vegagerðin) publishes daily road status updates at road.is. Attempting to drive an F-road marked as closed is illegal and will again void rental insurance.

Even in July and August, individual F-roads can close suddenly after heavy rainfall or ash falls from volcanic activity. Always check road.is the morning of any planned highland drive, and carry satellite communication (a PLB or satellite messenger like Garmin inReach) as mobile coverage is absent across most of the interior.

Essential Equipment for F-Road Driving

• Full spare tire (not a space-saver)
• Portable air compressor and tire repair kit
• High-lift jack and sturdy base plate
• Recovery straps and shackles
• Shovel
• Satellite communicator (Garmin inReach or SPOT)
• Minimum 2 days of food and water per person
• Emergency sleeping bag rated to -10°C
• Printed maps (GPS can fail)

The Most Popular F-Roads by Difficulty

Beginner: F35 Kjalvegur

The most accessible highland route, running between the Langjökull and Hofsjökull glaciers. Manageable for capable 4WD crossovers in dry conditions. No major river crossings. Serves the popular Kerlingarfjöll area.

Intermediate: F208 Fjallabaksleið Nyrðri

Passes through the dramatic Landmannalaugar area. Includes some river crossings and rough terrain. Requires genuine 4WD. One of the most scenic routes in Iceland.

Expert: F26 Sprengisandur

Crosses the vast central highland desert between north and south Iceland. Several significant river crossings, extremely remote, minimal markings in some sections. Only for experienced off-road drivers in properly equipped vehicles.

Summary

F-roads are among the most spectacular driving experiences on earth — but they punish the unprepared severely. Rent the right vehicle, check road.is every morning, never attempt a river crossing alone, and carry survival equipment. The highlands are worth it — but only if you come home.