Winter road map: which road, when it runs, what it serves

None of the maps below are ours to reproduce -- the NWT, Manitoba, and Ontario governments each maintain their own, and they update them through the season as conditions change. What follows is a plain-language rundown of the named roads and networks, so the government map means something before you click through to it. For how these roads are actually built, and how load limits and ice thickness work, see /roads/.

Tibbitt to Contwoyto Winter Road (NWT)

This is the private heavy-haul road serving the Ekati, Diavik, and Gahcho Kué diamond mines north of Yellowknife -- built and funded by the mining companies themselves, not a public highway. Its own operator states the road runs about 400 km north of Yellowknife, though the exact route (and therefore total length) can shift year to year depending on which lakes and portages are used, which is why you'll see figures anywhere from roughly 400 to 600 km reported for it. The Government of the NWT's 5-year average puts the opening around February 6 and the closing around March 30, though the operator's own construction schedule normally starts in mid-December aiming for a February 1 opening.

Dettah Ice Road (NWT)

A short seasonal crossing of Great Slave Lake linking Yellowknife to the community of Dettah -- about 6.4 km, far shorter than the industrial roads above. It's a public ice road maintained by the territorial government, and its 5-year average runs from around January 2 to around April 13, one of the longer seasons on this page because it's a lake crossing rather than a long overland route exposed to a wider range of conditions.

Tłı̨chǫ community winter roads: Gamètì and Wekweètì (NWT)

The Tłı̨chǫ community of Whatì used to depend on a winter road too, but that changed in November 2021 when the Tłı̨chǫ All-Season Road -- a permanent gravel highway -- opened, giving Whatì year-round access for the first time. Gamètì and Wekweètì are further out and still rely on a seasonal winter road that extends past Whatì each winter. Per the NWT government's 5-year averages, the Gamètì Winter Road typically runs from around February 17 to around April 13, and the Wekweètì Winter Road -- the furthest and last to open -- typically runs from around March 15 to around April 13. We could not confirm a standalone length figure for either road from an official source, so none is given here.

Manitoba's northern winter road system

Manitoba runs the largest winter road network in the country: more than 2,381 km of temporary road connecting 22 communities and over 30,000 Manitobans who have no year-round highway access. It's how fuel, building materials, and food supplies get in for the year, split into a handful of regional systems (the East Side and North systems being the biggest) rather than one continuous road. The province states a typical season of mid-January to mid-March, weather permitting.

Ontario's northern (James Bay) winter road network

Ontario's winter roads program connects remote First Nation communities in the Far North -- including the James Bay coast communities of Attawapiskat, Fort Albany, and Kashechewan, which link through to Moosonee and from there to the provincial highway network at Cochrane -- along with the Town of Moosonee itself. Government-cited figures put the current network at roughly 3,200 km serving 32 First Nation communities plus Moosonee. Ontario's own program page describes the season running from around mid-January until spring thaw; other government-cited figures describe a typical window of six to eleven weeks, into late March. The James Bay stretch itself is built and run by Kimesskanemenow LP, a partnership of the communities it connects, not the province directly.

Sources

• NWT Dept. of Infrastructure — Winter Roads Average Open/Close Dates — accessed 2026-09-07.
• DriveNWT — official NWT highway and winter road conditions map — accessed 2026-09-07.
• Tibbitt to Contwoyto Winter Road — About the Winter Road (operator site) — accessed 2026-09-07.
• Tibbitt to Contwoyto Winter Road — background and length range — accessed 2026-09-07.
• Tłı̨chǫ Government — All-Season Road (Whatì) — accessed 2026-09-07.
• Manitoba Transportation and Infrastructure — Winter Roads — accessed 2026-09-07.
• Province of Manitoba news release — Manitoba's Winter Roads System — accessed 2026-09-07.
• Government of Ontario — Northern Ontario Winter Roads (official program page) — accessed 2026-09-07.
• Ontario Construction News — 2025-26 Winter Roads Program funding and network figures — accessed 2026-09-07.
• Kimesskanemenow LP — James Bay Winter Road — accessed 2026-09-07.