You can start after the last threat of frost, and that depends on where in Michigan you grow, probably mid May. Most outdoor growers start their purchased seeds indoors for two to three weeks under lights to give them a much higher chance of survival. Scroll down through the archives at this site and at seed boutique to read the answers to questions you need to know. If you want to be successful many hours of reading noobie questions and experienced growers answers is a good way to learn