In chicago we get plenty of veg even in the middle of winter (granted it's through use of greenhouses, hoop houses, etc.). Beyond that you can essentially grow

In chicago we get plenty of veg even in the middle of winter (granted it's through use of greenhouses, hoop houses, etc.). Beyond that you can essentially grow a good amount of stuff until the ground freezes (unless you use some of the newer ground insulation methods) especially tubers, etc.