How to Extend Your Growing Season
Extend your season with row covers, cold frames, and cloches. A cold frame adds 4–6 weeks on each end of the season.
You don’t have to stop gardening when the weather cools. You just have to protect your plants.
Methods
| Method | Protection | Cost |
|---|---|---|
| Row covers | 2-4°F | $10-20 |
| Cloches | 5-10°F | $5-15 each |
| Cold frames | 10-20°F | $50-200 |
| Greenhouse | 20°F+ | $200+ |
| Mulch | Roots only | Free |
Cold Frame Basics
- Box with glass or plastic top.
- South-facing.
- Open on warm days to prevent overheating.
- Close at night.
What to Grow in Extended Season
- Lettuce
- Spinach
- Kale
- Carrots
- Beets
- Radishes
Common Questions
How much does a cold frame extend the season? 4-6 weeks on each end.
Can I use a plastic sheet? Yes. But remove it in the morning to prevent overheating.
Do I need a heated greenhouse? No. Unheated extends the season significantly.
What about winter? In mild zones, cold frames allow winter harvest.
Is it worth the cost? For salad greens, yes. Pays for itself in one season.
Can I DIY a cold frame? Yes. Straw bales + old window.