Thinking of driving in or out of Montreal for Labour Day weekend? Here are the city’s major road closures
Posted September 4, 2026 7:45 am.
This Labour Day weekend, Montreal drivers will be getting a little extra time to admire the city — whether they like it or not.
The city’s road network is facing numerous closures and disruptions, with 42 construction sites affecting major arteries and highways across Montreal. Some of those disruptions will last for the entire month of September, as the city also prepares to host two major cycling events.
The Ministère des Transports et de la Mobilité says Highway 25, including the Louis-Hippolyte-La Fontaine tunnel, will be closed toward Montreal during the long weekend, from Sept. 4 to 8.
Highway 25 toward the South Shore, including the tunnel, will also be closed at night. These obstructions are required to repair pavement slabs and some fire protection signs at the entrance to the tunnel. These interventions follow incidents and skirmishes that have occurred over the past year. Maintenance work will also be carried out.
Souligny Avenue will be closed westbound, between Honoré-Beaugrand Street and Exit No. 4 of Highway 25 southbound, during the night of Sept 1. The closure is necessary to complete the construction of the concrete island and maintenance on the drainage system. In addition, access to Highway 25 northbound will be closed the same night. These closures are required to carry out landscaping work.
André Durocher, director of the CAA-Quebec Road Safety Foundation, said drivers should expect significant delays, with some trips potentially taking twice as long.
“If you cannot stand the fact that you’re going to be stuck in traffic, well, maybe you should think about it again and not go,” he said.
He also expects traffic to spill over into residential streets, creating additional safety concerns for pedestrians and cyclists.
““These roads are not necessarily made to accommodate such large amounts of traffic,” Durocher said. “So therefore, it becomes more dangerous.”
Highway 25 and the La Fontaine Tunnel
Highway 25 toward Montreal:
- Closure of the two right lanes of Highway 25 northbound between the entrance from Notre-Dame Street East and exit 5 (Route 138, Sherbrooke Street), from Tuesday, 9 p.m., to Wednesday, 5 a.m.
- Complete closure of the entrance from Notre-Dame Street East, from Tuesday, 9 p.m., to Wednesday, 5 a.m.
- Exit 5 (Route 138 Sherbrooke Street) will be closed from Tuesday at 8:30 p.m. to Wednesday at 5 a.m.
- Complete closure of Highway 25 toward Montreal (including the Louis-Hippolyte-La Fontaine tunnel) between exit 90 (Highway 20 West, Route 132, La Prairie, USA, Varennes, P.-E.-Trudeau airport) and the entrance from Sherbrooke Street, from Friday, 11 p.m., to Tuesday, 5 a.m.
- The entrances to this section will be closed 30 minutes before the highway is completely closed.
- A police presence is planned in the area to facilitate traffic.
Highway 25 toward the South Shore:
- Complete night closure of Highway 25 toward the South Shore (including the Louis-Hippolyte-La Fontaine tunnel) between exit 5 (Route 138, Hochelaga Street, Sherbrooke Street) and the entrance from Île Charron, according to the following schedule:
- Friday, 11 p.m., to Saturday, 8 a.m.;
- Saturday, 11 p.m., to Sunday, 9 a.m.;
- Sunday, 11 p.m., to Monday, 8 a.m.
- The entrances to this section will be closed 30 minutes before the highway is completely closed.
Souligny Avenue eastbound, between Dickson and Honoré-Beaugrand streets, will be closed 30 minutes before the complete closure of Highway 25.
Souligny Avenue westbound:
- Complete night closure of Souligny Avenue westbound, between Honoré-Beaugrand Street and Exit No. 4 of Highway 25 southbound, from Tuesday, 11 p.m., to Wednesday, 5 a.m.
- A detour will be set up via Honoré-Beaugrand, Hochelaga and Dickson streets.
Parc Avenue closure
Drivers visiting the Plateau will also encounter construction on Parc Avenue. The road was closed southbound on Friday, with the entire road expected to be closed from Sept. 9 to Oct. 4.
The closure is already causing headaches for some local business owners.
John Rodousakis, owner of Fleuriste Venus and Crèmerie La Vache Glacée, says his businesses expect to lose $20,000 because the flower shop will close for a week, from Sept. 20 to 27, during the UCI World Cycling Championships.
Rodousakis said the road closures are making it difficult for the flower shop to guarantee delivery times.
“I can’t tell somebody you’re going to have an 11 a.m. delivery and it shows up at 3 o’clock in the afternoon,” he said.
He’s also concerned about the impact on the ice cream business, since many of the cycling races will take place in the morning.
“Ice cream doesn’t sell at 6:30 and 7:30 in the morning. So most of these races are going to be held in the morning,” Rodousakis said.
Rodousakis said he still isn’t sure how the business will deal with the disruptions.
“I don’t even know how we’re going to attack it,” he said.
More major closures later this month
The Labour Day weekend disruptions are only the beginning of a busy month for Montreal’s road network.
The Champlain Bridge will be closed toward Montreal on the mornings of Sept. 26 and 27.
Highway 10 toward Montreal will also be completely closed from Sept. 19 to 22.
Work may be postponed or extended due to adverse weather conditions or operational constraints. Before hitting the road, it is recommended that you consult Québec 511, a practical tool for properly planning your trips, and download the Québec 511 mobile app to activate notifications.
