I have a shed to store my tractor that is enclosed on three sides. It is a pretty small shed where the tail end of the tractor just fits. I have been thinking about putting a tarp over the tractor during the winter when I am not using the tractor which could be as much as 2 or 3 months. If I use a tarp it will provide extra protection to keep any weather that might blow in off the tractor but it might increase the chance of critters building nests underneath the tarp. If I don't use a tarp I get no extra protection but don't have as big a chance of critter damage to the tractor. What do you think?