Answer: You can set your vegetable seedlings out in mid-May in a sunny garden bed. Amend the soil with some compost prior to planting and your veggies should thrive. Here's a publication from Michigan State University that lists specific cultivars along with their planting dates: http://web1.msue.msu.edu/imp/modp1/morefile/E0004E.pdf
You can download the publication for reference throughout the gardening season. Hope you find it helpful!
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