An extension of A-35 to meet Interstate 89 at Saint-Armand will complete a nearly 500 km (310 mi) limited-access highway link between Montreal and Boston.

The name refers to a chain of forts built by the French in the Richelieu Valley during the 17th and 18th centuries to defend their colonial settlements from the Iroquois.

On June 10, 2019, Federal and provincial government officials announced plans to extend Quebec's Highway 35 by nearly 9 km (5.6 mi) in the southbound direction (Phase III), extending Highway 35 from Route 133 in Saint-Sébastien to the junction of Route 133 and chemin Champlain and du Moulin in Saint-Armand.

[8] This work began in 2020, and as of December 2023 the majority of Phase III has been completed, including an overpass for Route 202 over Highway 35 in Pike River.

[12] Phase IV will complete 4.5 km (2.8 mi) of the project between the intersection of Route 133 and Champlain and du Moulin Roads in Saint-Armand to the U.S.