The best time to plant seeds for a summer crop, such as tomatoes, cucumbers, watermelon and most flowers, is in the spring. For hot climates, such as Florida or southern California, plant in February.
For warm climates with colder winters, such as Texas, parts of California and the southeastern states, plant in late March or early April.
For cold winter climates such as North and South Carolina and Virginia, plant in late April. For all other cold winter climate states like the Midwest and Northeast, plant in mid to late May and June.
When planting seeds for fall, pick plants that will survive your region's temperatures. Fall crops will do best in warmer climates such as the southeastern states and California where temperatures are mild.
Begin planting seeds for fall crops in late August. Vegetables like radishes, cabbage, spinach and kale are mostly tolerant to frost. Carrots and onions can be planted in the fall in warm climates for harvest in the spring.