Leaving your tipi up over the winter without tending to it can allow snow to build up on the canvas. The snow can get heavy and will eventually stretch the canvas and might permanently bow your tipi poles. To get snow off your tipi cover, use a broom instead of a shovel once you come close to the canvas, to avoid poking holes into it. Constant exposure to moisture will also cause the tipi to mold. As much as possible, give the canvas the chance to dry out by making frequent fires in your tipi, especially in the winter. If you know you cannot tend to your tipi much during the wet season, the best would be to take it down. If you cannot take it down, we suggest having your cover fully painted, or be diligent about renewing the canvas protective finish every fall.