In zone 8, spinach grows best in the cool months. Sow your main crop in fall: the last sowing date is about September 9, and in mild winters it keeps growing until spring. You can also sow in late winter, from February 17 to March 10, for a spring harvest before the heat.
Spinach dates for your ZIP code
Planting times based on university extension guidance (UNH, Cornell, Purdue, Minnesota, Nebraska and UMass Extension). Frost dates from NOAA 1991–2020 U.S. Climate Normals, nearest weather station. Zones derived from the 2023 USDA Plant Hardiness Zone Map data (PRISM Climate Group, Oregon State University). This is not the official USDA Plant Hardiness Zone Map.
Spinach timing in zone 8
| Task | When |
|---|---|
| Sow outside | February 17 – March 10 |
| First harvest | March 27 – April 24 |
| Sow for fall by | September 9 |
| Main season | Fall through early spring |
| Sow again | Every 2 weeks in fall |
| Summer substitute | New Zealand or Malabar spinach |
Most of zone 8 sees its last spring frost between March 25 and April 6 (typical March 31) and its first fall frost between October 31 and November 9 (typical November 4). Spinach tolerates frost, so early sowing is safe. The tool above uses the weather station closest to your ZIP code.
Why spinach is planted early
Spinach is a cool-season crop that grows best at 50–60 °F and tolerates frost. It bolts, sending up a flower stalk and turning bitter, as the days lengthen and warm up in late spring. That is why it is sown weeks before the last spring frost, and again in late summer for fall.
Best spinach varieties for zone 8
In zone 8, spinach is a fall, winter and early spring crop. Heat and long days make it bolt fast, so choose slow-bolting varieties:
- Slow-bolting: Tyee, Olympia, Space, Acadia and Indian Summer.
- Classic, long-standing: Bloomsdale Long Standing.
- For summer: heat-loving New Zealand spinach and Malabar spinach, which aren’t true spinach but cook the same way.
How to plant spinach
- Sow seeds directly in the garden, about ½ inch deep, once the soil is about 45 °F.
- Space seeds 1–4 inches apart in rows or wide beds.
- Thin when the leaves touch and plants are about 2 inches tall. Eat the thinnings.
- Sow again every two weeks for a continuous harvest.
- Keep the soil evenly moist for fast, tender growth.
Zone 8 spinach tips
- Wait for cool soil in fall. Spinach grows best at 50–60 °F, so start sowing once late-summer heat breaks.
- Sow in batches every couple of weeks through fall for a steady winter supply.
- Finish before the heat. Spring spinach bolts as days lengthen and warm up, so sow it in late winter.
- Harvest the outer leaves and let the center keep growing.
Harvesting spinach
Spinach is ready in about 27–50 days, depending on the variety. Cut the full-size outer leaves and leave the center to keep growing, or cut the whole plant. Once it starts to send up a flower stalk, harvest everything, because the leaves turn bitter.
Spinach planting dates in nearby zones
See dates for every zone on the spinach planting guide, or build a full schedule with the planting calendar.
Frequently asked questions
Is it too late to plant spinach in zone 8 in March?
For spring, yes: it will bolt in the heat. Sow your next crop in fall, by about September 9.
Can spinach grow all winter in zone 8?
Yes. In mild-winter areas, spinach sown in fall keeps growing through winter. Cover it on the coldest nights.
Can spinach handle frost?
Yes. Spinach is frost tolerant and grows best in cool weather, so it is sown three to six weeks before your last spring frost.
Why does my spinach bolt?
Long days and warm temperatures in late spring trigger bolting. Sow early and choose slow-bolting varieties such as Tyee or Olympia.
How deep should spinach seeds be planted?
About ½ inch deep, 1–4 inches apart.
Sources. Planting dates use the median frost dates of each USDA zone, calculated from NOAA climate data for every ZIP code in the zone.