Major Projects: When Will They Open?
Official dates and independently reported dates for the Ontario Line, Scarborough extension, Gardiner rebuild and more.
The Crosstown opened about six years late, so announced dates deserve company. Each project here carries the official date and what independent reporting says, with sources — checked June 12, 2026.
Ontario Line
ComingOfficial target: 2031. Metrolinx's CEO said in February 2026 the line is trending towards "the early 2030s".
A 15.6 km subway from Exhibition to the Science Centre. Downtown tunnelling began in April 2026, with boring machines heading east from Exhibition, and the four downtown station names — King West, Chinatown, Distillery District, Leslieville — were finalized that same month.
The most felt side effect: Queen Street between Bay and Victoria has been closed to vehicles since May 2023 for station construction and is expected to stay closed until about 2027, with streetcars on diversion.
Scarborough Subway Extension
ComingOfficial target: about 2030. Internal TTC emails reported by the Toronto Star in May 2026 point to 2033.
Three stops extending Line 2 from Kennedy to Sheppard Avenue and McCowan Road. Tunnelling passed the halfway mark in March 2026, and major construction at the Scarborough Centre station site began in September 2025. Costs have risen past $10 billion.
Scarborough busway (old Line 3 corridor)
ComingScheduled to open by the end of September 2026.
About four kilometres of dedicated bus corridor on the former Line 3 right-of-way, with stops at Kennedy, Tara Avenue/Mooregate Avenue, Lawrence East and Ellesmere, plus priority bus lanes on Ellesmere Road toward Scarborough Town Centre. Until it opens, the replacement buses that have run since Line 3 closed in July 2023 stay in mixed traffic.
Gardiner Expressway rebuild
In force nowSection 2 (Dufferin to Strachan) finished in October 2025, more than a year early. Section 3 early bridge works run to about November 2026.
The rebuild has moved west: early works on five bridges between Highway 427 and the Humber River continue through 2026, with lane reductions paused from May to July 2026 for the World Cup and the westbound lane drop lifted in May 2026.
The full at-grade rebuild of the western stretch is slated for 2027–2031, and later sections have no published dates — Gardiner construction will be part of driving here into the 2030s.
Bloor-Yonge station expansion
ComingMajor construction is planned to start in 2027, with completion expected in 2029. No independent date has been reported yet.
A $1.5-billion expansion of the network's busiest interchange: bigger Line 1 platforms and a new second platform for Line 2 eastbound trains. The development-phase contract was signed in March 2025. The station stays open throughout, so expect years of construction around live crowds.
Eglinton Crosstown West Extension
ComingNo opening date announced. Tunnelling finished in 2024; stations and systems work continues.
A 9.2 km, mostly underground westward extension of Line 5 from Mount Dennis to Renforth, with seven stations, meeting the Mississauga Transitway at its western end. Metrolinx has not committed to an opening year.
Dates to watch
End of September 2026
Scarborough busway scheduled to open
November 2026
Gardiner Section 3 early bridge works due to finish
About 2027
Queen Street at Yonge expected to reopen to traffic
Closed since May 2023 for Ontario Line station construction.
2027
Bloor-Yonge expansion major construction set to begin
2029 – early 2030s
The big openings, officially
Bloor-Yonge expansion (2029 expected), Ontario Line (2031 official; "early 2030s" per Metrolinx's CEO), Scarborough Subway Extension (about 2030 official; 2033 per internal TTC emails reported by the Toronto Star).