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416TRAFFIC/ know before you go

ConstructionTue, May 19, 2026 – Sat, May 23, 2026HWY 409 (Westbound)

Nightly Maintenance on HWY 409 Westbound between MARTIN GROVE ROAD and ATTWELL DRIVE, Toronto.

Construction · Tue, May 19, 2026 – Sat, May 23, 2026

★ IMPACT 3/5 · ★ SOURCE-BACKED CLOSURE RECORD

★ Quick facts

Road: HWY 409 (Westbound)
Location: Between MARTIN GROVE ROAD and ATTWELL DRIVE
Start date: Tue, May 19, 2026 · 10:00 PM
End date: Sat, May 23, 2026 · 5:00 AM
Lanes affected: 2 Left Lane(s)
Severity: Heavy
Source: Ontario 511Event ID 243338

What's affected

HWY 409 (Westbound) between MARTIN GROVE ROAD and ATTWELL DRIVE is impacted by construction work. Expect impact to 2 Left Lane(s).

Same-day events

TTC Line 1 (Yonge-University) - Sheppard-Yonge to Eglinton stations - Nightly early closures starting at 11 p.m. - Tuesday, May 19 to Thursday, May 21, 2026
May 19 · Toronto transit
TTC Line 2 - Kennedy to Woodbine stations - Nightly early closures starting at 11:59 p.m. - Tuesday, May 19 to Friday, May 22, 2026
May 19 · Toronto transit
Toronto Marlies v Cleveland Monsters- AHL Playoffs Round 3 Home Game 1
May 20 · Coca-Cola Coliseum
TTC Line 1 (Yonge-University) - Sheppard-Yonge to Eglinton stations - Nightly early closures starting at 11 p.m. - Tuesday, May 19 to Thursday, May 21, 2026
May 20 · Toronto transit
TTC Line 2 - Kennedy to Woodbine stations - Nightly early closures starting at 11:59 p.m. - Tuesday, May 19 to Friday, May 22, 2026
May 20 · Toronto transit
RBC Amphitheatre Opening Night: Imagine Dragons
May 21 · RBC Amphitheatre
Brennan Lee Mulligan's ENDLESS DUNGEON
May 21 · Coca-Cola Coliseum
TTC Line 1 (Yonge-University) - Sheppard-Yonge to Eglinton stations - Nightly early closures starting at 11 p.m. - Tuesday, May 19 to Thursday, May 21, 2026
May 21 · Toronto transit
TTC Line 2 - Kennedy to Woodbine stations - Nightly early closures starting at 11:59 p.m. - Tuesday, May 19 to Friday, May 22, 2026
May 21 · Toronto transit
Toronto Blue Jays vs Pittsburgh Pirates
May 22 · Rogers Centre

Plan ahead

Read next

★ RoadHighway 409 statusSegment-level closures, long-running restrictions, and upcoming work.read →★ DayTraffic on Tue, May 19, 2026Same-day events and other road restrictions around this closure.read →★ ClosuresAll road closuresBrowse active and upcoming construction records.read →