Iceland’s F-roads will close your rental car insurance the moment you turn onto one without the right vehicle — and most people only find that out after something goes wrong. These highland tracks cut through some of the most remote terrain in Europe, and the rules around them are serious, specific, and enforced. If you’re planning to drive into the interior, here’s what you actually need to know.
What Iceland F-Roads Actually Are
F-roads are unpaved mountain tracks that cross Iceland’s highland interior — the hálendið. The F in the designation stands for fjallvegur, meaning mountain road. They’re maintained by the Icelandic Road and Coastal Administration (Vegagerðin), but maintained loosely — they’re cleared of snow in late spring, sometimes June, and they close again in autumn, often by October. Between those dates, conditions can still change fast.
These are not gravel roads like Route 1 in the east. F-roads cross lava fields, glacial rivers, and highland plateaus where there’s no phone signal, no petrol station, and no one coming to help you quickly if you break down. That’s not meant to put you off. It’s context.
Which Roads Carry the F Designation
The most-travelled F-roads are F35 (Kjölur), which runs between Gullfoss and Varmahlíð and is considered one of the more accessible highland routes, and F26 (Sprengisandur), which crosses the central desert between the south and north — bleaker, longer, harder. Then there’s F210 leading to Landmannalaugar, F208 toward Eldgjá, and F88 into Ásbirgi and the Öskjuhlíð area near Askja. Each one has its own character and its own risks.
The Kjölur route is roughly 170 km and can feel manageable on a dry summer day. Sprengisandur is closer to 200 km through almost nothing — and I mean nothing. A puncture out there is a different conversation than a puncture near Selfoss.
Highland Driving Rules You Can’t Ignore
The law here is clear: you need a 4WD vehicle with high clearance to drive F-roads legally and safely. A standard AWD crossover is not sufficient for the deeper river crossings. A 2WD car of any kind is not legal on F-roads and will void your rental insurance immediately.
River crossings — vatnsföll — are the part most visitors underestimate. Some F-roads have bridges, but many don’t. You’re driving through moving glacial meltwater, and the depth and current change depending on time of day and recent weather. Glacial rivers run higher in the afternoon when meltwater peaks, so crossing in the morning is generally safer. I’ve waited at Innri-Emstruá for an hour watching the level drop before crossing. It’s the right call.
How to Cross a River Safely
Before you drive in, watch other vehicles cross if possible. Walk the crossing first if you’re unsure — yes, get out of the car and walk it. Check depth with a stick or your boots. Enter at an angle slightly upstream. Keep moving steadily; stopping mid-crossing lets water back up against the door seals. And never cross if the water looks murky or is above your wheel hubs on a proper highland 4WD.
If you stall mid-river, do not restart immediately — water may have entered the intake. This is the situation rental companies dread, and it’s one of the most expensive mistakes visitors make in Iceland. River damage to a vehicle is not covered by standard CDW insurance. You’ll need SAAP (Super Accident Protection) or specific gravel protection, and even then, river damage is usually excluded. Read the insurance terms before you leave Reykjavík.
F-Road Opening Dates and How to Check Them
F-roads don’t open on a fixed calendar date. Vegagerðin assesses each road individually based on snow, river levels, and road surface condition. In 2024, F35 Kjölur opened in mid-June. Some years it’s late May. Some years parts of F208 don’t fully clear until July.
The place to check is the official road conditions map at road.is. Roads marked red are closed. Green means open. But open doesn’t mean easy — conditions can shift after rain or a sudden warm spell that lifts river levels.
Check Veðurstofa Íslands — the Icelandic Met Office — for weather forecasts in the highlands specifically. The highland interior generates its own weather, and conditions there can be dramatically different from the coast. I’ve driven into sunshine at Geysir and hit near-zero visibility by the time I reached the F35 junction an hour later.
The Safarí Rule Nobody Tells You About
Off-road driving is illegal in Iceland. Not just frowned upon — illegal, and the fines are significant. Driving off the marked track damages the fragile highland moss and volcanic soil, which can take decades or longer to recover. Wardens do patrol the popular routes in summer, and tourists have been fined heavily for leaving the road to take a better photo or bypass a muddy section. Stay on the track, full stop.
What to Bring for Highland Driving in Iceland
The highlands have no services. Between the start of F35 at Gullfoss and Varmahlíð in the north, there’s one hut at Hveravellir where you can buy coffee and basic supplies — and that’s it. Everything else you carry. That changes your preparation compared to Ring Road driving.
At minimum, bring:
- Enough fuel to complete the route plus 20% buffer — most highland-ready rentals have large tanks, but check yours
- Food and water for at least one extra day, in case you’re stuck
- Warm layers and waterproofs even in July — highland temperatures can drop suddenly
- A paper map or downloaded offline GPS — phone signal is non-existent for most F-roads
- A tow rope, basic tools, and a reflective triangle
- A fully charged emergency battery pack for your phone
Tell someone your route and expected arrival time. The 112 Iceland app (available for free) lets you register your travel plan with emergency services. Use it. Seriously. Rescue teams from Landsbjörg (the Icelandic Association for Search and Rescue) operate here, but response times in the interior can be hours.
Renting the Right Vehicle for F-Road Highland Driving
Not all 4x4s are equal for this. A small SUV like a Dacia Duster or Suzuki Jimny works for Kjölur on a good day but will struggle at deeper crossings. For Sprengisandur, Askja (F88), or anything involving serious river crossings, you want a proper high-clearance vehicle — a Toyota Land Cruiser, a modified Land Rover Defender, or a purpose-built camper with genuine off-road spec.
Rental prices for a capable highland 4WD start around 25,000–40,000 ISK per day (roughly €165–€265 or $180–$290), plus insurance. That’s a real cost difference from a standard Ring Road rental, but it reflects the actual vehicle you need. The companies that specialise in highland-ready vehicles — several operate out of Reykjavík and Keflavík — will give you a proper briefing on the specific roads you plan to drive. Take that briefing seriously. It’s not a formality.
What Happens If You Drive an Unsuitable Car
Vegagerðin inspectors and police can stop you on F-roads and turn you back. I’ve seen it happen on F35. Beyond the legal issue, the practical reality is that unsuitable vehicles get stuck, damaged, or swept in river crossings. And then someone else has to come and get you out — often a rescue team working on a volunteer basis. That’s not a small thing.
The environmental angle matters too. Spinning wheels on soft highland soil causes damage that’s immediately visible and very slow to heal. Iceland takes this seriously, and so should anyone who wants the interior to still be worth visiting in twenty years.
The Best Time to Drive Iceland’s F-Roads
July and August are the sweet spot. Roads are most likely to be open, river levels are more predictable, and daylight is essentially continuous — which matters when you’re making time across a long highland route. September can still be good for Kjölur, but the weather window tightens fast, and snow can arrive at highland elevations without much warning.
Early morning starts make a real difference. River crossings are safer before afternoon melt peaks, you avoid the worst of any tourist traffic at trailheads like Landmannalaugar, and if something goes wrong, you have more daylight and time to deal with it.
If you go in late June, be prepared for sections that are muddier and softer than they’ll be in July — the ground stays saturated longer at altitude. And always check road.is the morning you plan to depart. Roads that were open the day before can close overnight after rain.
The highland interior is genuinely one of the most remarkable places I’ve driven anywhere — vast, strange, and unlike anything on the coast. Getting it right just takes preparation. When you’re driving across the Sprengisandur with nothing in any direction for 80 km, you’ll understand why it’s worth doing properly.
