To keep the harvest going into cool weather, some crops are best started indoors in midsummer and set out as the worst heat passes. This gives them a head start while protecting seedlings from summer pests and sun.
Which crops benefit most
Brassicas (cabbage, broccoli, cauliflower, kale) and lettuce hearts do well started indoors in summer. Starting inside means you skip the hardest part of summer and plant sturdy transplants in September.
A simple sowing calendar
Count back from your first frost date: broccoli 10–12 weeks, cabbage 8–10 weeks, lettuce 4–6 weeks. Use a calendar and stick to it — consistency beats perfection.
Harden off before planting
Gradually expose seedlings to outdoor conditions over 7–10 days. This prevents shock and gives you vigorous plants ready to take off in the cool soil of fall.
- Use a fan on seedlings to grow stocky, not leggy, stems.
- Bottom-water to keep leaves dry and disease-free.
- Label every tray — fall mixes are easy to confuse.
- Transplant on a cloudy day for least stress.
Fall gardening is mostly summer planning: the work you do in July pays off in November.