October brings first frosts to many northern gardens, while much of the South can still plant a wide range of cool-season vegetables. Local frost dates and USDA zone should determine whether you harvest, protect, or continue sowing.

Start indoors in October

Start small batches of lettuce, spinach, kale, and other greens indoors for protected growing under lights, a greenhouse, or a cold frame. In warm regions, start onions and cool-season brassicas indoors only if their local winter schedule calls for transplants.

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

In zones 3 to 6, harvest tomatoes, peppers, squash, and other frost-sensitive crops before freezes, then sow only very hardy greens in protected structures. Plant garlic after soil has cooled but before it freezes solid, following locally appropriate timing.

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

In zones 7 to 10, continue sowing lettuce, spinach, carrots, beets, radishes, peas, kale, and other cool-season vegetables. Plant garlic and onions when recommended for your local region, and transplant brassicas for winter harvest.

Garden tasks for October

Cover hardy beds before frost and cure winter squash in a warm, dry protected place if weather permits. Remove diseased plant debris, save seed only from healthy open-pollinated plants, and mulch garlic after planting in colder areas.

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