Whenever I can get there.
-- Summer - sucks mowing yard, mowing sister-in-law's yard, mowing neighbor's property. Wind up mowing about 15 - 20 acres, most of it weekly. If it rains, I'm too busy mowing, or working on the mower, or the tractor, or something. If it doesn't rain it's typically to damn hot in the shop. If you open the shop at night to cool it off, it fills up with bugs. Thus the only time I get shop time is while it rains, and then living way out here in the sticks on the Flash and Flicker Power Company, I usually get about half turned into a project and the power goes out.
-- Fall/Winter - is heavily dedicated to hunting. Having your deer stand a minute's walk out your back door can be a disadvantage if you're an addict. And, while I'm really not an addict, I've found that catching big fish and shooting big bucks is commonly more a matter of being in the right place at the right time, than anything, and being there often increases your chance of finding that magic moment exponentially.
-- Spring - typically too busy to do anything in the shop. Chasing bees, mowing grass, running non-stop... if I do find a free moment I typically just want to sit down and relax for a minute.