NotHardUp1
What? Me? Really?
Huntsville is in Zones 7a to 7b for hardiness. That means our average minimum temperature is usually between zero to 10 degrees Fahrenheit.And what kind of feckless, delicate snowflake roses would flame out at -4F?
Nurseries here sell cutivars that are suited to that range, and minus four, sustained, would be, to quote The Holy Hand Grenade of Antioch blurb, "right out."
The fact that the roses had grown to full bushes and were well established bore testimony to them having been cited well. It's just unfortunate that the severity of the cold was too much. I'm sure all the losses locally, and there were many, are being replaced with hardier varieties.
The only thing I lost was a couple of buddleias and a large Dakota fig up on the hill. I also had duranta repens and jasmine in large planters, but had no reason to expect them to survive such severe lows unprotected.
I believe Toronto is in US hardiness zone 5, so you would indeed have plants selected for much colder minimums.

