Markham, ON → Windsor, ON

Your journey from Markham to Windsor covers approximately 279 miles through the heart of Ontario's most densely populated and industrially significant corridor. You'll begin by heading west on the Gardiner Expressway or Queen Elizabeth Way, depending on your starting point in the Greater Toronto Area, before merging onto the Queen Elizabeth Way toward Niagara. This initial stretch takes you through the Greater Toronto Area's urban landscape, where you should expect moderate to heavy traffic during peak hours, particularly if you're departing during morning or evening commute times. Once you clear the Hamilton area, you'll transition onto the Chedoke Expressway and then merge onto Highway 403, which carries you westward through some of southern Ontario's most economically important industrial zones.

As you progress westward on Highway 403 toward London, you'll notice the landscape gradually shifts from densely populated urban sprawl to rolling agricultural terrain interspersed with small towns and manufacturing centers. The drive through this middle section is relatively flat, with gentle elevation changes that characterize Ontario's agricultural heartland. You'll pass through or near significant towns including Cambridge, Galt, and Woodstock, each representing the region's blend of historic communities and modern commerce. This section of Highway 403 is generally straightforward driving with good infrastructure, though construction can occasionally affect traffic flow during summer months.

Your final approach to Windsor takes you through more rural landscape on Highway 401 West and Highway 402, bringing you closer to the Great Lakes region and Windsor's position on the border with Detroit. This last portion of the drive, roughly the final hour, showcases southwestern Ontario's agricultural character before you arrive at the city's urban edges. The entire route is predominantly highway driving with minimal elevation changes, making it accessible year-round. Spring and fall offer the most pleasant driving conditions with comfortable temperatures and good visibility, while winter requires extra caution due to potential snow and ice on the highways, particularly in the elevated sections near the Escarpment. Summer travel is feasible but plan for possible construction delays and ensure your vehicle is well-maintained for the four-plus-hour journey.

The 279-mile drive from Markham, Ontario to Windsor, Ontario takes approximately 4h 40m under normal conditions. Weather along this route can vary significantly, especially across varying terrain where weather conditions can change rapidly. Route Outlook helps you find the safest time to travel by showing you weather conditions at every point along your route, timed to when you'll actually be there.

Common Weather Hazards on This Route

• Winter storms and heavy snowfall (November through April)
• Black ice on mountain passes and bridges

Seasonal Driving Considerations

The Northeast corridor sees the full range of seasonal weather. Nor'easters from November through March can dump heavy snow and create whiteout conditions, while ice storms make roads treacherous. Summer and fall offer excellent driving conditions, though fall foliage season brings heavier traffic on scenic routes. Spring can bring unpredictable rain and residual freeze-thaw damage to road surfaces.

Best Time to Drive Markham to Windsor

For medium-distance drives like this 279-mile route, consider starting in the early morning to arrive before afternoon storms develop. Check the 7-day forecast above to find a day with favorable conditions along the entire route.

Driving Strategy

A 279-mile drive from Markham to Windsor takes a significant part of the day. Plan at least one fuel and rest stop along the way. If your route crosses elevation changes or state lines, expect weather conditions to shift mid-trip. Monitor the segment-by-segment forecast rather than just checking destination weather. Starting early in the morning typically avoids afternoon storm development and rush-hour congestion near urban areas.

Frequently Asked Questions