Planting times for vegetables and other annual plants vary from species to species. In much of the United States the prime consideration is the date of the last spring frost/freeze. Many vegetables can be planted up to four weeks before the last frost, while others need to wait until a couple of weeks after the frost.

Another consideration is the date of the first fall frost/freeze. In northern latitudes, where summers can be short, the length of time some vegetable species take to reach maturity (most notably tomatoes and peppers) make it necessary to plant vegetable seeds indoors and then transplant the seedlings outside at the appropriate time.

Other vegetables and fruits, such as winter squashes and some melon varieties, seem to do better when planted as seeds directly where they are going to stay. With maturation times up to twelve weeks, it may be critical to get vegetable seeds planted as early as it is safe to do. If you have a short growing season, and wish to grow these crops, choose vegetable varieties that will reach maturity within a safe time period for your area.

My personal observation has been that vegetable seed crops planted at their earliest safe date are less likely to fall victim to insects than later plantings. If you have a small vegetable garden it