August bridges summer harvests and fall planting, with very different conditions in northern and southern gardens. Use your first-frost date, local heat patterns, and USDA zone to select crops that have enough time to mature.

Start indoors in August

Start lettuce, kale, cabbage, broccoli, cauliflower, and other fall crops indoors when outdoor heat makes germination difficult. Calculate the crop's maturity time plus a buffer before your local first frost, and use shade or cool indoor conditions for seedlings.

Plant outdoors: cool & northern regions (zones 3–6)

In zones 3 to 6, sow spinach, arugula, lettuce, radishes, turnips, Asian greens, carrots, and beets for fall harvest where time remains before frost. Transplant sturdy fall brassicas and use row cover to protect young plants and extend the season.

Plant outdoors: warm & southern regions (zones 7–10)

In zones 7 to 10, sow or transplant fall vegetables such as broccoli, cabbage, cauliflower, kale, lettuce, carrots, beets, peas, radishes, and greens as local heat declines. Continue harvesting summer crops and replace exhausted plants with varieties suited to your fall season.

Garden tasks for August

Keep harvesting at peak ripeness and preserve surplus by freezing, canning with tested methods, or drying. Check plants for hornworms, spider mites, squash bugs, and disease, then clean up badly declining crops to reduce pest pressure.

Regional guidance for US home gardens; always adjust to your own last and first frost dates. Page updated Aug 4, 2026.