Rainbow Road to St Arnaud
High country mining track with serious fords
Rainbow Road cuts 63 kilometers through the heart of Nelson Lakes National Park, following old gold mining routes from the 1860s that carved their way up the Wairau Valley. The track starts innocently enough from Highway 7 but soon turns serious with multiple unbridged creek crossings, including the notorious Ada River ford that’s claimed more than a few bumpers. At Hanmer Pass (1145m), you’ll cross the Main Divide with views stretching across both Canterbury Plains and Tasman Bay on clear days.
This is expert-level terrain demanding articulated 4WD with diff-locks and underbody protection. The Ada River crossing alone can be impassable after heavy rain, trapping vehicles for days. Best tackled December through March when snow’s cleared but creek levels remain manageable. Carry recovery gear, extra fuel, and supplies for 2-3 days — the nearest help is hours away. The reward is access to some of South Island’s most pristine high country, plus the satisfaction of completing one of New Zealand’s most challenging legal 4WD routes.
Trail Specs
| Difficulty | Expert |
|---|---|
| Trail Type | Technical 4x4 |
| Surface | Rock |
| Features | High Altitude, Historic, Remote, Water Crossings |
| Length (miles) | 39 mi / 63 km |
| Duration | 2-3 days |
| Max elevation (ft) | 3760 ft |
| Best season | December-March |
| Minimum vehicle | Modified 4WD with diff-locks |
| Nearest town | St Arnaud, Tasman |
| Land manager | Department of Conservation |
| Permit required | No |
| Cell service | None |
| Water crossings | Yes |
| Dispersed camping | Yes |
| Start coordinates | |
| End coordinates | |
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Location
Trail Conditions
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Frequently asked questions
Can a stock Hilux or Patrol run this trail?
No. You need a modified 4WD with front and rear diff-locks at minimum. High clearance is non-negotiable given the rock surfaces and deep stream crossings — a lifted, locker-equipped rig is the baseline, not a bonus.
When is Rainbow Road to St Arnaud actually passable?
December through March is your window. Snow closes the high country sections outside summer, and the stream crossings become genuinely dangerous in spring snowmelt. Even in summer, a single weather event can turn the fords sketchy fast.
Do I need a permit to run this trail?
No vehicle permit required, but the trail runs through Nelson Lakes National Park managed by the Department of Conservation. Standard NZ backcountry rules apply — leave no trace, respect hut and camping areas, and check current track conditions with DOC before you go.
What's the hardest section and what should I expect?
The stream crossings are the crux — multiple fords that can run thigh-deep or higher after rain, with rocky, uneven beds that will throw your line. The rocky high-altitude sections demand patience and precise wheel placement; rushing anything here will end your trip early.
There's zero cell service — how do I handle emergency comms on a 2-3 day trip?
A PLB (Personal Locator Beacon) is mandatory in New Zealand backcountry and non-negotiable on a trail this remote. Satellite messengers like a Garmin inReach work too. File a detailed trip plan with a responsible person and give DOC a heads-up — 39 miles of no-signal expert terrain is not the place to wing it.
Trail track
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