Although rabbits are surprisingly well adapted to cold temperatures, but if the temperatures down to below 20 degrees F, you will need to take some precautions to keep your rabbit warm and stay healthy in their hutch at these temperatures.
At first, you have to get the best outdoor rabbit hutch, and then follow this post to know some tips to make sure your rabbits are kept warm over winter.
#1 Choosing outdoor rabbit hutch
It is netter to get the outdoor insulated hutch. The rabbit hutch must be waterproof and should have a solid roof with a slight overhang to keep rain and snow out of the hutch.
If your hutch has the wire mesh windows, it is better to choose the one that comes with the removable panel to cover the wire mesh windows, which help reduce drafts and keep the hutch dry. Or you will need to construct the windbreaks. Avoid sealing up the hutch entirely; it can lead to the lack of ventilation
#2 Using a heat pad
You should provide a heated pad for your rabbit and place inside the sleeping area in their hutch, which may increase the ambient temperature in the hutch as well. However, make sure your rabbit has plenty of space to get off the pad easily if the heat pad becomes too hot.
Your rabbits might chew their heat pad, so make sure that it is made of hard plastic. The pads comes with a fleece cover, offer the comfortable platform for your pets.
#3 Using bedding
Do not skip this work. A think layer of newspaper will help retain the heat. Straw is warmer than hay, so you can place a layer of dry straw above newspaper. Or you can mix straw with hay to use as bedding and litter for rabbit then your rabbits will have hay to eat at all times. Using bedding also allow rabbits can dig in and burry themselves.
#4 Cover up
During the winter, you should keep your pets far away from cold wind, rain & snow by using the tarpaulin and cardboard to cover up the hutch. Place tarpaulin cover the top of the hutch will make it water proof. And then use cardboard to cover the wall inside the hutch to against draft. You can stuff the bubble wrap in any small holes in your hutch will also help to keep draft out.