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While normally the early cropWhile normally the early crop is planted around March to mid April, a second crop for a later harvest can be done mid-June to mid July, according to the Kentucky Cooperative Extension. (I'm sure you can plant in between those times as well, if you don't want to stagger harvests.) You might be interested in this publication from the Kentucky Cooperative Extension:

2015 Garden Calendar2015 Weather Watcher's Calendar2015 Recipes Calendar2015 Engagement Calendar 2015 Everyday Calendar2015 Country CalendarNew Year Cross StitchLobster Rope Doormats