Perth to Darwin campervan route: coast, Kimberley and the long way north

You can drive Perth to Darwin in 7 or 8 punishing days if your idea of a holiday is a spreadsheet and a numb backside. Most campervan travellers should allow 14 to 21 days, especially if you want Exmouth, Karijini-style detours, Broome, Lake Argyle or Kakadu without eating dinner in the dark every night.

The route is mostly sealed 2WD highway: Brand Highway, North West Coastal Highway, Great Northern Highway and the Stuart Highway. The sting is distance. Karratha to Broome is roughly 850 km if done in one hit, which is legal but joyless; split it around Port Hedland, De Grey River, Pardoo or 80 Mile Beach if your hire conditions and site availability suit.

• Do: build in one non-driving day every 3 or 4 days for washing, water, food and not hating each other.
• Don't: plan 600 km days back-to-back in a high-roof motorhome in 38°C heat.
• Good rhythm: 350 to 450 km driving days, then a two-night stop at Exmouth, Broome or Kununurra.

This is not the place to roll into town on the fuel light while pretending the van is a camel. Fuel is available often enough on the sealed route, but roadhouse hours can change, card machines can sulk, and diesel prices in remote WA and the NT can sit well above city prices. A 70-litre tank at 12 L/100 km gives about 580 km in theory; headwinds, air-con, hills and a heavy water tank can bite into that.

The biggest practical gaps are not always the longest on the map; they are the ones where you skip a servo because it looks expensive, then discover the next one is 300 km away. Between Port Hedland, Sandfire Roadhouse and Broome, treat every stop as useful. From Kununurra to Timber Creek to Katherine, same story.

• Geraldton to Carnarvon: about 480 km, with Billabong Roadhouse roughly mid-way.
• Port Hedland to Sandfire Roadhouse: about 290 km; then Sandfire to Broome is about 320 km.
• Fitzroy Crossing to Halls Creek: about 290 km; fuel up before leaving either end.
• Kununurra to Timber Creek: about 230 km; Timber Creek to Katherine about 285 km.
• Do: top up before remote legs, carry drinking water separate from the van tank, and keep snacks where the passenger can reach them.

The best perth to darwin motorhome road trip is a mix: powered holiday parks when you need air-con, laundry and a proper shower; national park campgrounds when the stars are showing off; and a few legal free camps when you just need to stop before the kangaroos start clocking on.

Free camping rules vary by shire and park. Sleeping in a van on a town foreshore where signs say no camping can earn a fine that is often around $100 to $300. In national parks, book and pay online where required, use marked sites only, and expect generator rules, no-dog rules and seasonal closures. Cape Range near Exmouth is brilliant but popular; Broome and Kununurra powered sites can fill fast in the dry season.

• Dump points: commonly available in Geraldton, Carnarvon, Exmouth, Karratha, Port Hedland, Broome, Fitzroy Crossing, Kununurra, Katherine and Darwin.
• Water fills: use caravan parks, visitor centres or signed potable taps; never assume a rest-area tap is drinkable.
• Powered nights: budget roughly $45 to $75 for many northern WA holiday park powered sites in peak dry-season periods.
• Do: empty the cassette before long remote legs; nobody becomes a better person carrying a full toilet through 40°C.

Road trains are part of the furniture up here, except the furniture is 53 metres long and doing 100 km/h. Give them room, keep left, and when overtaking, wait for a long, flat, empty section. If one is passing you, ease off slightly and hold your line; do not drift onto the shoulder like a startled emu.

Most campervans and 2WD motorhomes are fine on the sealed Perth to Darwin route. The trouble starts when a tempting dirt shortcut appears. Many hire agreements restrict unsealed roads, beach driving, river crossings, Gibb River Road, Mitchell Falls Road and remote tracks. Wet-season closures can also shut Kimberley roads with very little romance and plenty of mud.

• Vehicle height: know it before pulling into old fuel awnings, low trees or city car parks; many motorhomes sit around 2.7 to 3.4 m high.
• Tyres: check pressures cold, and inspect sidewalls after rough shoulders or gravel parking areas.
• Wildlife: avoid driving at dawn, dusk and night, especially north of Carnarvon and across the Kimberley.
• Don't: take a 2WD hire motorhome onto a dirt detour because a bloke at the bottle-o said it was fine last year.

May to September is the classic northbound window: warm days, cooler nights inland, lower humidity in the Top End, and most Kimberley touring infrastructure open. Expect Perth in the high teens to low 20s °C in winter, Exmouth and Broome often 28 to 33°C by day, and Darwin sitting around 30 to 32°C even when southerners are wearing scarves.

October to April is hotter and riskier for a campervan route. The Pilbara can push past 40°C, the Kimberley and Top End can be humid and stormy, and floods may close roads or campgrounds. If you travel then, powered sites become less of a luxury and more of a survival strategy for sleep.

• Dry season: book Broome, Exmouth, Kununurra and Darwin sites early, especially during school holidays.
• Wet season: check Main Roads WA and NT road reports daily before moving.
• Cyclone season: November to April; know your caravan park's emergency instructions.
• Do: check availability online before locking flights or one-way hire dates.