The Diamond Circle Iceland loop runs about 260 km off Route 1 through Goðafoss, Lake Mývatn, Dettifoss, Ásbyrgi and Húsavík. You can drive it in one long day. Two days is better, and the thing that decides your day is which road you take to Dettifoss.
The Diamond Circle Iceland route is a tourist-board name for a genuinely useful loop in the north: about 260 km taking in Goðafoss, Lake Mývatn, Dettifoss, Ásbyrgi canyon and the whale harbour at Húsavík. Someone drew the shape on a map and decided it looked like a cut stone. Ignore the branding, keep the route.
Goðafoss and Mývatn sit directly on Route 1, so you pass them anyway on a Ring Road trip. The other three are the detour, and the detour earns a day of your week. Most people drive it from Akureyri, which adds around 90 km of getting in and out, or from Reykjahlíð on the lake, which sits closer to the middle of it.
Counter-clockwise from Goðafoss, with honest drive times. Four to five hours behind the wheel before you stop to look at anything.
The one real decision on this route. Dettifoss has two banks, no bridge at the falls, and a different road to each.
Switching banks means driving back to Route 1 or north to road 85, around 90 minutes either way. Pick a side, see it properly, move on. North of the falls, 862 turns to gravel for the run to Ásbyrgi and closes in winter along with 864.
Neither 862 nor 864 is an F-road, so a 2WD is legal on both. Gravel damage is still the most common rental claim in Iceland — check that your policy includes gravel protection before you sign. Actual F-roads, the ones numbered with an F, legally require a 4x4, and your insurance is void the moment a 2WD turns onto one. River crossings are never covered, on any car, under any policy.
Rough shape of the year, which is why a summer plan and a winter plan look nothing alike.
Studded winter tyres are fitted by law roughly November to April; rentals handle it, confirm when you book. Check road.is and vedur.is every morning. Wind closes more of this route than snow does.
From Akureyri in summer: out at 08:00, back around 20:00. Five hours of driving, six of stops, and Mývatn is what gets rushed. It works. It has no slack in it.
The better version splits it. Day one, Goðafoss and then Mývatn slowly, the nature baths late in the afternoon, and a bed at the lake — see where to stay in Mývatn. Day two, Dettifoss early while the car park is empty, Ásbyrgi at midday, Húsavík in the afternoon for a boat, then back to Akureyri or a night in Húsavík.
If the clock is against you, cut in this order: Ásbyrgi, then the east bank of Dettifoss, then Krafla and Víti crater. Do not cut Hverir. The steaming ground at Námaskarð is five minutes off Route 1 and takes twenty.
Húsavík is why a lot of people add this loop at all. Boats sail roughly April to October, with June to August the reliable window. Humpbacks are the usual sighting, plus minke whales and white-beaked dolphins. Blue whales turn up in Skjálfandi bay some Junes, and nobody can promise you one.
A standard trip is two and a half to three and a half hours on an old wooden schooner, somewhere around €90 to €130 per adult. RIBs cost more, go faster, get wetter. In July and August book a day or two ahead, because weather cancellations push everyone onto the next sailing. Overalls are handed out at the dock; take the seasickness tablet before you board, not after.
The whale museum by the harbour is worth an hour in bad weather. More in activities.
A small 2WD handles the whole loop in summer if you take the west bank of Dettifoss. For 864, take clearance and accept a slow, noisy hour each way. Book early for July and August — compare rental car options and read the excess and gravel terms rather than the headline rate.
Route 1 is about 1,322 km and paved the whole way, and seven days is the realistic minimum for the loop — seven days without the Diamond Circle in them. Add a day, or two if you want Mývatn and Húsavík unhurried. The 7-day Ring Road itinerary shows where the north falls in the week.
Counter-clockwise from Reykjavík you arrive here on day five or six, after the east fjords and Höfn. Clockwise you get here on day two or three, which is the better order if the north has the good forecast early.
One warning from the other side of the island. On the south coast leg, treat Reynisfjara near Vík seriously — sneaker waves there have killed people. Stay well up the beach and never turn your back on the sea. Route notes for the rest of the ring are in all guides, and beds for that stretch in where to stay in Vík.
About 260 km and four to five hours of driving, so it fits into one long day from Akureyri or Mývatn. Two days is the better version: Goðafoss and Mývatn on the first, Dettifoss, Ásbyrgi and Húsavík on the second. If you want a whale-watching boat as well, plan on two.
No. None of the route is an F-road, and a 2WD is legal on every road on the loop. Road 864 to the east bank of Dettifoss is rough gravel and more comfortable in something with clearance. Check that your rental policy includes gravel protection, and remember that F-roads and river crossings are a different matter entirely: F-roads require a 4x4 by law and void a 2WD policy, and river crossings are never insured.
Road 862 on the west bank is paved from Route 1 to the car park, has a sealed path and a wide viewing area, and is open far longer in the year. Road 864 on the east bank is 35 km of gravel and gives the low head-on view photographers want, but it usually only opens in June. If you have one shot at it, take 862.
Road 864 and the gravel stretch of 862 north of Dettifoss towards Ásbyrgi are typically open from June until the first real snow in autumn, then closed for winter. The paved southern part of 862 stays open longer but can still shut in a storm. Check road.is and vedur.is on the morning you plan to drive.
Partly. Goðafoss, Mývatn and Húsavík are reachable year round on Route 1 and road 85, and Ásbyrgi usually is from the Húsavík side. Dettifoss is often unreachable between November and April. Studded winter tyres are fitted by law roughly November to April, daylight is short, and wind is the thing that closes roads up there.
Boats run roughly April to October, and June to August is the dependable stretch. Trips last two and a half to three and a half hours and cost somewhere around €90 to €130 per adult, more for a RIB. Book a day or two ahead in high summer, since a cancelled sailing pushes everyone onto the next one.