Zones 7 and 8 have a year-round gardening opportunity most residents underutilize. Average minimum winter temperatures are 0°F to 10°F (zone 7) and 10°F to 20°F (zone 8). Summers are hot, but winters are mild enough that cold-hardy vegetables grow actively through December and into February without protection in many locations. The Pacific Northwest coast, mid-South, and upper coastal South all fall in this range.
Planting Timing for Winter Crops
Zone 7 first fall frost: October 15 to November 15. Zone 8: November 1 to December 1. Crops must be established before temperatures drop below 50°F. Start fall plantings while there is still warmth to reach harvestable size. In zone 7, start transplants by early September. In zone 8, start transplants by late September and direct sow through mid-October.
Key Crops for Zone 7-8 Winter Gardens
Kale: Start transplants late August, direct sow in September. Winterbor handles single digits°F; Red Russian to about 15°F; Lacinato is beautiful and very cold-hardy. Kale sweetens dramatically after frost. Swiss chard: Survives zone 8 winters open; needs N-50 cover in zone 7. Fordhook Giant is most reliable. Spinach: Sow Bloomsdale Long Standing or Tyee in September, harvest from late February as growth resumes. Arugula: Hardy to 15°F without protection. Mâche: Germinates in cold soil, grows through winter, earliest spring harvest of any green. Root vegetables: Turnips, parsnips, carrots (Napoli), and beets (Detroit Dark Red) overwinter in the ground and sweeten with frost. Leave in ground and harvest as needed.
Pacific Northwest Winter Gardening
The PNW coast is zone 8 with a unique climate: mild, wet, rarely hard-freezing. The challenge is moisture and low light, not cold. Stars of PNW winters: Purple Sprouting Broccoli (planted late summer, overwinters, produces February-March), leeks (overwinter for March-April harvest), winter cabbage (January King and Savoy types need no cover), and Brussels sprouts (improved by frost). Drainage is critical — raised beds prevent root rot in soggy winter soil.
Season Extension
N-50 row cover over a low tunnel takes reliable overwintering down to about 10°F for cold-hardy crops. A cold frame allows crops to actively grow through January (zone 8) and February (zone 7). Low tunnels with polycarbonate glazing are ideal in the PNW — they shed winter rain while admitting light.
Frequently Asked Questions
- Can I grow winter lettuce in zones 7 and 8?
- Yes. Winter Density, Arctic King, and Valdor survive zone 8 winters open and zone 7 under N-50 cover. Growth slows in January but resumes in February. Harvest outer leaves to extend the window.
- What is Purple Sprouting Broccoli?
- A long-season broccoli planted in summer, harvested February through April — producing dozens of small purple florets over 6-8 weeks. Hardy below 10°F when established. Varieties: Rudolph (earliest), Claret F1, Red Admiral.
- How do I prevent root rot in a wet winter garden?
- Raised beds solve most problems — even 6-8 inches of elevation improves drainage dramatically. Choose wet-winter-tolerant varieties: Savoy cabbages, Batavian lettuces, and mâche outperform standard types in soggy soil.
- Can I grow garlic in zones 7 and 8?
- Yes — these are excellent garlic zones. Plant hardneck varieties in October-November, harvest in June (zone 7) or July (zone 8). Rarely needs heavy frost mulching.