When to Plant Spinach in Missouri
Published: April 24, 2026
Missouri gardeners in Zone 6b have a 33-week growing season for spinach (March 22 to November 10). Missouri's spring and fall windows both work well for spinach — some gardeners plant both successions for a long harvest. This guide gives exact dates for Missouri based on your local frost calendar.
Spinach Planting Dates for Missouri
| Start seeds indoors | Year-round |
| Last frost (average) | March 22 |
| Direct sow outdoors | February 15–25 |
| Expect first harvest | March 27 – April 6 |
| Fall crop start | September 29–October 9 |
| Fall harvest | November 8 |
| First fall frost (average) | November 10 |
Dates above assume Zone 6b, the most common zone in Missouri. Gardeners in cooler St. Louis (Zone 6b) plant 1–2 weeks later; warmer Kansas City (Zone 6a) can plant 1–2 weeks earlier.
⚠ One of the earliest spring vegetables — sow 4–6 weeks before last frost. Bolts in heat above 75°F. Plant again in late summer for a fall harvest.
Growing Spinach in Missouri's Climate
Missouri's moderate Zone 6b climate is well-suited to spinach with minimal special accommodation. The standard transplant calendar works as written, and harvest windows line up with what seed packets recommend without adjustment.
Succession planting extends your spinach harvest significantly in Missouri. A second planting 3 to 4 weeks after the first gives you a backup in case of pest pressure and extends the total harvest window into early fall.
Common spinach pests to watch for in Missouri include Leaf Miner and Aphid. The first line of defense is companion planting: Pea and Strawberry planted nearby discourage several of these pests by confusing host-plant identification or repelling adults before they can lay eggs. Weekly garden walks in the early morning catch problems when they're still manageable.
Spinach Garden Calendar for Missouri
| Month | Task | Notes |
|---|---|---|
| January | — | Dormant season |
| February | Direct sow seeds | Sow seeds 1/4–1/2 inch deep, 6 inches apart |
| March | First harvest window opens | Spinach begins producing 40–50 days after transplant |
| April | — | Dormant season |
| May ← | Watch for bolting | Harvest promptly; spring heat arrives quickly |
| June | — | Dormant season |
| July | — | Dormant season |
| August | — | Dormant season |
| September | Fall crop planting | Transplant or direct sow for fall harvest before frost |
| October | — | Dormant season |
| November | First frost approaches | Harvest remaining spinach; cover plants on frost nights |
| December | — | Dormant season |
Spinach Growing Tips for Missouri Gardeners
- •Direct sow in very cold soil — spinach germinates at 35°F, earlier than almost any other crop.
- •Succession plant every 10 days until 2 weeks before heat sets in for continuous spring harvests.
- •Missouri's moderate climate supports succession planting — sow new transplants or seeds every 3 weeks during spring to extend the harvest window into fall.
- •Switch to bolt-resistant varieties like Malabar or New Zealand spinach for summer heat (though technically different species).
Companion Planting for Spinach in Missouri
In Missouri's moderate climate, planting spinach with Pea and Strawberry helps deter pests and improve soil. Avoid planting near Fennel, which inhibit spinach growth through root chemistry or shared pest pressure. See the full spinach companion planting guide for the complete list.
Spinach Planting Dates by City in Missouri
Top cities in Missouri — select for city-level frost dates and planting calendars.
Frequently Asked Questions
When should I plant spinach in Missouri?
In Missouri (Zone 6b), start spinach seeds indoors around Year-round and transplant outdoors around null — 0 weeks after the state's average last frost of March 22.
What is the last frost date in Missouri?
Missouri's average last frost date is March 22 in the state's most common Zone 6b. Frost dates vary by city — higher elevations and northern counties run 1 to 3 weeks later than the state average. See the city list below for city-level frost dates.
Can I grow spinach year-round in Missouri?
spinach is a cool-season crop in Missouri, with spring and fall windows. Summer heat bolts the plants before they can produce a harvestable crop. Succession planting every 2–3 weeks stretches the harvest window.
What spinach varieties grow best in Missouri?
For Missouri's Zone 6b, consult a local nursery or extension office for spinach variety recommendations.
When do I start spinach seeds indoors in Missouri?
Spinach does not need indoor starting in Missouri — direct sow around February 15–25 once soil reaches 35°F. Indoor starting is not recommended for this crop because spinach transplants poorly.