Abstract: The invention provides a portable shelter including a base, a seat, and a collapsible windscreen assembly which is mounted on the base around the seat. The portable shelter according to the invention can be readily transported over snow or ice, and then set up for winter sports such as ice fishing. In preferred embodiments, the base of the unit defines a storage compartment wherein the windscreen assembly can be stowed when not in use. A cushioned seat functions as the lid for the storage compartment. According to an additional aspect of the invention, the seat is disposed in parallel to the bottom wall of the base which supports the unit so that the unit need not be turned on end prior to use.