Yes, the hutch is designed as an all year home, and the insulation will keep your rabbits cosy in winter. In fact, most rabbits are very good at handling colder temperatures and will gradually grow a thicker coat in winter, and moving them in and out is likely to be more harmful. You can help them by adding more hay and straw to the hutch, provide shelter with covers and hides on the run, or add a Extreme Temperature Jacket to the Eglu Go.