Kaldidalur (Road 550): The Highland Gravel Drive Without an F-Road Permit
If you want the feel of Iceland’s interior without committing to a full F-road expedition, Kaldidalur (Road 550) is the drive to know. It runs across a high, cold valley between Húsafell in Borgarfjörður and the Þingvellir area near the Golden Circle, threading between the Langjökull glacier and the Ok volcano. The catch: it looks easy on the map, but it comes with rules that can void your rental insurance if you ignore them.
What Road 550 actually is
Kaldidalur is one of the shortest highland routes in Iceland, sometimes called “highlands for beginners.” It’s an unpaved gravel road, roughly 40 km through the valley itself (closer to 50 km if you count the full run between the lowlands on either end). There are no unbridged river crossings, which is the main reason it’s considered approachable. Along the way you get long views of Langjökull, the Ok volcano and the shield mountain Skjaldbreiður — bare, high, and very different from the green farmland down by the Hvítá river.
The 4×4 rule you can’t skip
Here’s the part that trips people up. Road 550 is not officially F-marked, so it doesn’t read like a restricted route. But Icelandic rental companies treat it as one: driving a 2WD car on Kaldidalur voids your standard insurance, and you can face fines and service charges on top of any damage. In short, a 4×4 is required in practice even though the law doesn’t stamp an “F” on the sign. Rent the right vehicle, confirm with your rental company that Road 550 is covered, and you’re fine. The roughest stretch is roughly between km 25 and 40, with loose stones and the occasional pothole, so keep speeds sensible even in a 4×4.
When it’s open, and what to bring
This is a summer-only road. It typically clears of snow around mid-to-late June and stays open into early September, but a heavy winter or cold spring can push the opening later. Always check road.is (Vegagerðin, the Icelandic Road and Coastal Administration) for the live open/closed status on the day you plan to go — do not assume it’s open just because it’s July.
- Route: Húsafell toward Þingvellir via Road 550 — about 40 km of gravel through the valley.
- Getting there: Húsafell is roughly a 35–40 minute drive from Hvítárbakki; the 550 turn-off is just past it.
- Driving time: allow about 1.5–2 hours for the pass alone, more with photo stops.
- Vehicle: 4×4 required by rental terms; a 2WD car voids your insurance here.
- Timing: summer only, typically late June to early September — verify on road.is first.
- Bring: a full tank (no fuel on the pass), water, snacks, layers and a windproof jacket — it’s high and cold even in summer.
Where to Stay
Base yourself at Hvítá Trucks, the converted expedition trucks on the bank of the Hvítá river at Hvítárbakki. It’s the natural launch pad for Road 550: you’re already on the Borgarfjörður side, about 35–40 minutes from Húsafell and the start of the pass, so you can head out early on a clear morning and be back at your truck by evening. Book direct on Ourhotels.is for the best rate.
Photo: Kevin Hadley via Wikimedia Commons, CC BY-SA 3.0.