Tibbitt to Contwoyto Winter Road
World's longest heavy-haul ice road to diamond mines
The Tibbitt to Contwoyto Winter Road operates for roughly 10 weeks each winter as the world’s longest heavy-haul ice road, spanning 400 kilometers from the end of Highway 4 near Yellowknife to the Contwoyto Lake area diamond mines. This industrial lifeline consists of approximately 87% lake ice and 13% land portages, crossing dozens of frozen lakes connected by short overland sections. Massive transport trucks haul a year’s worth of supplies to remote mines including Ekati and Diavik, while the road remains open to public travel during operating season.
This is extreme Arctic driving requiring winter survival preparation and ice road experience. The route operates only when ice thickness exceeds safety minimums, typically February through April. Public travelers must register and carry emergency equipment including sleeping bags rated to -40°F, extra food, and communication devices. Speed limits are strictly enforced to prevent ice damage, and vehicles must maintain specific following distances. The experience offers access to Canada’s most remote mining frontier and the ultimate test of winter driving skills across the barren beauty of the central Arctic.
Trail Specs
| Difficulty | Expert |
|---|---|
| Trail Type | Overland Route |
| Surface | Ice |
| Features | Arctic, Historic, Remote, Seasonal |
| Length (miles) | 248 mi / 400 km |
| Duration | 2-3 days |
| Max elevation (ft) | 1640 ft |
| Best season | February-April |
| Minimum vehicle | 4WD with winter equipment mandatory |
| Nearest town | Yellowknife, Northwest Territories |
| Land manager | RTL Robinson Enterprises |
| Permit required | Yes |
| Cell service | None |
| Water crossings | No |
| Dispersed camping | No |
| Start coordinates | |
| End coordinates | |
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| Find on Google | Search on Google → |
Location
Trail Conditions
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Frequently asked questions
Can a stock 4x4 truck run this road, or do you need a purpose-built rig?
A stock 4WD truck can technically meet the minimum requirement, but you need aggressive winter tires (not all-seasons), a cold-weather survival kit, satellite communicator, fuel for 400km with no services, and the mechanical confidence to self-rescue at -40°C. This is not a trail to test an unproven rig.
When exactly is the road open each year?
Typically February through early April, depending on ice thickness. Opening and closing dates shift year to year based on temperatures — the road needs roughly 42 inches of ice to support heavy haul trucks. Check with RTL Robinson Enterprises for the current season's status before you go.
Do private vehicles actually need a permit to drive this road?
Yes. The Tibbitt to Contwoyto Winter Road is operated by RTL Robinson Enterprises as an industrial haul road, and private vehicle access requires prior authorization from them. You are sharing the road with massive ore trucks — this is not a public highway and access is not guaranteed.
What's the most dangerous section and what makes it hard?
The lake crossings are the critical sections — you're driving on ice over deep Arctic lakes, sometimes with pressure cracks and overflow (water that seeps up through the ice surface and refreezes). Whiteout conditions can eliminate all visual reference between the ice surface and the horizon, making it nearly impossible to spot hazards ahead.
There's no cell service for 400km — what's the communication plan if something goes wrong?
A satellite communicator (Garmin inReach or equivalent) is non-negotiable here. There are no towns, no services, and no rescue infrastructure along the route — the only other traffic is industrial haul trucks on a schedule. File a detailed trip plan with someone reliable before you leave Yellowknife.
Trail track
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