Lots of people grow all year long indoors/outdoors. You can start any time but timing for outdoor plant-out is key. The biggest problem starting too early in my opinion will be space/light as well as aphids and other pests. If you start now with good lighting you should have massive plants by plant-out time but you'll need lots of space and major lighting. I prefer to start plants January to March under cheap floro lights so they are small and easy enough to manage until spring.