A massive early morning fire tore through two buildings in Oshawa on Tuesday, including a recently opened retro-style diner on Simcoe Street South.
Oshawa Fire and Emergency Services confirmed crews were called to a structure fire in the area of Simcoe Street South and Olive Avenue shortly after 1:30 a.m. on March 3, 2026. Emergency responders arrived to find heavy flames engulfing two separate buildings.
Freelance photojournalist Colin Williamson reported on social media platform X that intense fire conditions were visible from a distance, with flames shooting from both the Simcoe St Diner and a neighbouring structure. Video footage from the scene showed large flames and thick smoke pouring into the night sky as firefighters worked to contain the blaze.
The Simcoe St Diner, known for its 1950s retro design and classic diner fare, had only opened in June of last year. The restaurant quickly gained attention in the community for its nostalgic atmosphere, all-day breakfast menu, burgers and milkshakes. Its vintage décor and vibrant exterior made it a recognizable landmark along the busy Simcoe Street corridor.
Fire crews remained on scene for several hours battling the blaze. The intensity of the flames required a coordinated response to prevent the fire from spreading further. Officials have not yet released details about the second building involved, though it was also reported to have sustained significant damage.
As of Tuesday morning, there has been no confirmation regarding injuries. Fire officials have not indicated whether anyone was inside the buildings at the time the fire broke out. The cause of the fire remains under investigation.
Oshawa Fire and Emergency Services urged residents to avoid the area while crews continued suppression and investigation efforts. Road closures and traffic disruptions were expected around Simcoe Street South and Olive Avenue as emergency personnel secured the scene.
The fire marks a significant loss for the local business community, particularly given that the diner was relatively new and had been building a customer base since its opening. Community members expressed shock on social media as images and videos of the fire circulated early Tuesday morning.
The Ontario Fire Marshal may be called in to assist with the investigation if the damage is deemed extensive. Officials have not yet commented on whether the fire is considered suspicious.
Further updates are expected as investigators determine the origin and cause of the blaze and assess the structural integrity of surrounding properties.
