Ontario: The Long Haul on Highway 17

What to Expect

Ontario is where cross-Canada road trips get real. The province holds the longest and most varied section of the Trans-Canada Highway, stretching over 2,100 km from Ottawa to the Manitoba border on Highway 17. Most people underestimate it. Reddit threads are full of drivers who expected to breeze through Ontario in a day and ended up white-knuckling through Northern Ontario in the dark, low on fuel, with no cell service.

The route splits into distinct sections. The first 350 km from Ottawa to North Bay runs through the Ottawa Valley on decent two-lane highway. From North Bay, you push another 475 km to Sault Ste. Marie through Canadian Shield country with towns getting smaller and farther apart. Then comes the Lake Superior section from Sault Ste. Marie to Thunder Bay, 700 km of the most remote highway driving in Ontario. The final stretch from Thunder Bay to the Manitoba border is another 500 km through boreal forest.

The Four Sections

Driving Conditions

Northern Ontario Highway 17 is mostly a two-lane undivided highway. Passing lanes appear every 10-20 km in some sections, but between Sault Ste. Marie and Thunder Bay, you can get stuck behind slow-moving trucks for long stretches. The road surface varies from good to rough, with frost heaves common in spring.

In summer, construction season narrows things further. Ontario's Ministry of Transportation posts delays on their 511 website, and checking it before you leave is non-negotiable during June through September. Flaggers and single-lane alternating traffic can add an hour or more.

Fuel Strategy

Fuel prices increase as you go north. Expect to pay $0.10-0.20/L more than southern Ontario prices. The most expensive fuel is typically in White River and Wawa. Fill up in Sault Ste. Marie before heading north. Thunder Bay has competitive prices with multiple stations on the Highway 11/17 corridor.

Key fuel stops along the remote sections:

• Batchawana Bay - 75 km north of Sault Ste. Marie
• Wawa - The famous goose statue marks your fuel stop
• White River - Birthplace of Winnie the Pooh (and overpriced gas)
• Marathon - Reliable fuel, decent restaurant options
• Nipigon - Last reliable stop before Thunder Bay run

Best Time to Drive

Late June through early September is the window. July and August offer the longest daylight hours and warmest temperatures, but also peak construction and blackfly season north of Sudbury. September brings fall colours and fewer bugs but shorter days. Winter driving is possible but requires serious preparation: winter tires are mandatory in your own interest if not by law, and whiteouts along Lake Superior are genuinely dangerous.

Where to Stop Overnight

Breaking the Ontario section into 3 or 4 days is the smart play. Common overnight stops include:

• North Bay or Sudbury - End of Day 1 from Ottawa
• Sault Ste. Marie - Good hotel selection, restaurants on Queen Street
• Wawa or White River - Basic but functional motels for the Lake Superior push
• Thunder Bay - Full city amenities, good food scene on May Street