The article discusses the common mistakes that cost gardeners $200 in a single night due to late spring freezes. The article suggests that the last frost date is a historical average, not a guarantee, and half the time the freeze arrives later than expected, and that it is not a safe planting deadline. According to NC State Extension, frost conditions can damage warm-season plants at temperatures from 31°F to 33°F. The Alabama Cooperative Extension System also notes that many warm season vegetables, including peppers and tomatoes, can begin to see foliar damage at a temperature of 33. Water the soil the day before a freeze and avoid overwatering. Never add 3 to 5 degrees of protection on plants, and never burn all the leaves.