The state of Kentucky is in U.S. Department of Agriculture Plant Hardiness Map zone 6. This gives it a climate with mild winters and a long growing season for gardeners across the state to take advantage of.
You can start your vegetable garden around March 25 with hardy vegetables such as broccoli, carrots, kale, radishes, garden peas, turnips and collard greens. You can plant lettuce, cabbage, kohlrabi, beets, spinach and Irish potatoes beginning April 1, while watermelon, tomatoes, squash, cucumbers, eggplants, southern peas, cantaloupe and corn are ready to plant beginning May 1.
Kentucky's growing season is long enough for a second crop of some vegetables. You can plant turnips, radishes, spinach and mustard in August in preparation for a fall harvest. Plant lettuce in the beginning of September, while kohlrabi, cabbage, broccoliand carrots are ready to plant beginning in the last week of September.
Planting dates are approximate. Parts of southern Kentucky, including the cities of Mayfield and Bowling Green, are in the slightly warmer USDA plant hardiness zone 6b. Even with the slight difference in climate, it may be possible to move spring planting dates up to two weeks sooner.