Where I'm at mowing season never really ends. It does slow down in Dec. and Jan. though. Invest in some good leaf removal gear and that should make you some $ in the slow season. Also, try and put your customers on monthly payments. You can pro-rate it over the course of 12 months. That's what I do. In the winter I only work 1/3 as much as I do in the summer but I make the same money. I can't wait for winter to get here!