A tent for surrounding a base of an upstanding structure on a support surface is disclosed. The tent features a covering with a top edge arranged to follow a perimeter of the structure base and a bottom edge arranged to define an outer periphery of the covering. The tent additionally features a base strap arranged for forming a closed loop about the structure base at a predetermined height above the support surface. The base strap supports a first attachment member, and a second attachment member is located along the top edge of the covering for cooperating with the first attachment member to fasten the covering at the structure base. A tightening strap along the top edge of the covering but behind the second attachment member is arranged to follow the base strap to seal connection of the covering and the base strap.