Rabbits can handle cold temperatures reasonably well as long as they have a warm dry shelter. The warrens found in the wild are kept warm since they are below ground. As it is not possible to put the rabbit’s hutch underground, you will have to take extra precautions to keep the hutch warm in winter or cold weather. It is advisable to bring your rabbits inside or at least into a garage or shed when the temperature falls below 10 to 15 degrees F, but above these temperatures there are several methods you can use to keep your rabbit hutch warm.
Use heat lamps if you have an electricity supply covered with wires so that the rabbit does not touch them.
Raise the hutch above ground level to keep out damp. If it has no legs place a brick at each corner.
Insulate your hutch by putting a layer of polystyrene covered with plywood on the inside of the hutch or line the hutch with cardboard, newspaper and then lots of straw.