The closure was first implemented after 10 a.m.
Police said on Twitter that the decision to close the highways was made due to the extreme weather and the safety of drivers.
Police said it would allow for vehicles that got stuck to be moved and allow plows to clear snow.
Around 12:30 p.m., the Gardiner was reopened, followed by the southbound DVP lanes around an hour later.
Shortly before 2:50 p.m., police said both the Gardiner and DVP were fully reopened.
A blizzard warning was issued for Toronto and parts of the GTA Monday, with 40 to 60 cm of snow expected. The warning has since been lifted.
Officials have urged people to stay off the roads if possible.
Throughout the Toronto area, there were reports of drivers who got stuck as the historic storm hit the region.
Parts of Highway 401 were also at a standstill Monday morning.