It may seem odd to be starting new seeds when a lot of your summer produce like squash and tomatoes are still cranking, but it's well worth the effort. For reliable harvests in cooler weather, seedlings must have good initial growth and well-established root systems. The goal is to have fully grown, ready to pick plants that basically store themselves in the garden throughout the fall, so you can pick them as you need them over a long sustained harvest season.

Start seeds in containers or in a garden area with dappled sun or light shade – wherever seeds can germinate comfortably out of the hot sun but still get plenty of light after seedlings are well-established. Plant in well-prepared moist soil and in the evening so they will have the advantage of cooler night temperatures to settle in and minimize shock. If daytime temperatures are still in the high 80s, shelter your newly transplanted seedlings with row covers or a shade cloths for a few days so they can adjust to the heat and sun.

Once the seedlings have acclimated, don't forget to supply adequate moisture to these young crops and fertilize them regularly in the early growing stages. In USDA zones 8, 9, and 10, some fall-planted crops may overwinter as small plants and wait for spring temperatures to rise and daytime hours to get longer before heading or leafing up.