All the wild winter weather is taking a toll on Rock County's snowmobile trails. Heavy snows a little more than a week ago were welcomed by enthusiasts who heralded the opening of the snowmobile trails. Their joy may be short lived. Recent temperatures well above freezing, and now sub-zero weather, has prompted the closing of the trails. Rock County Parks Director Lori Williams Monday morning announced the trails will not reopen until there is sufficient snow on the ground again.