WARM SEASON CROPS
Warm season crops are plants that have adapted to warmer climates and are very sensitive to frosts. They must be planted after the last frost in the spring when the soils have warmed and night temperatures stay above 4550 degrees. In South Dakota this can range from early May to early June. Allowing the soil to warm further will create optimal growing conditions for these plants. Examples of these crops are tomatoes, peppers, eggplant, watermelon, squash, beans and sweet corn.
Warm season crops are susceptible to chilling injury. The cold temperatures cause plant growth failure. This results in rapid respiration, molds and rots on the plant and bitter flavors. This most often happens when the temperature drops below 45-50°. Cucumbers, tomatoes and tropical fruits and foliage are very sensitive to chilling injury.
Warm Season Vegetables:
Bean (Lima, Snap), Chayote, Corn, Cowpea (Southern Pea), Cucumber, Eggplant, Muskmelon, Okra, Pepper (Bell, Hot), Pumpkin, Soybean (Edible), Squash, Sweet Potato, Tomato, Watermelon.
General temperatures for warm season crops
Daytime – 60°F to 85°F
Daytime short-term temperature extremes – 50°F to 95°F
Nighttime – 55°F to 65°F
Germination – 60°F to 85°F
Very early spring (as soon as the ground can be worked)
After last frost date
Your guide to harvest times and availability in New York http://www.monroecc.edu/depts/agriculture/documents/harvestchart.pdf
Guide to Warm-Season Garden Vegetables