I wouldn’t recommend it. Actually, Snow and cold doesn’t phase bunnies, and they can handle -30 temps without any considerations. There are lots of reasons why outdoor playtime isn’t safe for bunnies. I have stopped letting my bunnies out to play in their pens – too much risk.
House rabbits are not used to outdoor noises – Rabbits are prey animals, which means they scare easily. Inside, usually with closed doors and windows, a house rabbit doesn’t hear many noises that will scare them. Outside, however, the overload of sound can be terrifying and can send a fragile bunny into shock.
Planes, cars, children, lawn mowers — you name it, any sudden, loud noise can send your placid house bunny into apoplexy.
House rabbits are not used to heat – Most rabbit owners want their pet house bunnies to play outside in the summer as the idea of all that sun sounds lovely. For a house rabbit, who is usually used to a constant, comfortable temperature, it’s not remotely fun particularly as he can overheat in minutes.
Unless you can be absolutely sure your rabbit is in a garden where the heat index is lower than 75 degrees, having a house rabbit play outside really isn’t a good idea. If you do decide to let him outside, however, please do it in the morning before the heat of the day hits.
Pesticides on grass – Many people who have a lawn also treat it with pesticides, so a rabbit grabbing huge mouthfuls of grass to eat can easily become ill. Unless your lawn is pesticide free, don’t let your rabbit out on the grass. The chemicals on it could kill him.
Rabbits are prey animals – Remember, rabbits are the quintessential prey animal. What that means is any passing hawk, cat, dog or even child.
Bugs – Rabbits can be bitten by mosquitoes, flies, contract fleas or come into contact with any number of other nasty creepy crawlies. Remember, a rabbit that has spent all his life indoors does not have the immunity an outdoor rabbit may have and can easily be bitten by something that could make him very sick. Myxo is a deadly disease brought on by Mosquitos. I doubt that in the cold in Canada there is myxo, but you can never be too sure.
Rabbits can escape – Rabbits are natural diggers and, boy, do they love to dig. Unfortunately, out in the back yard digging can mean a quick escape for a fast rabbit and, once out in the open without your protection, he would likely die. Hit by a car, picked off by a dog or a cat, or dying of starvation or cold. All of these things, and more, have happened to pet rabbits that have escaped, with the vast majority never being seen by their owners again.
These are all reasons why, while it may sound like fun for your pet house rabbit to play outside in the garden, most of the time it really isn’t. Besides, if he has a lot of room to run around indoors and fun things to play with, there’s absolutely no reason he needs to be out on the back lawn anyway.