When to Plant Tomatoes in Missouri
Published: April 21, 2026
Missouri gardeners in Zone 6b have a 33-week growing season for tomato (March 22 to November 10). The moderate climate supports a full warm-season crop plus an often-productive fall crop. This guide gives exact dates for Missouri based on your local frost calendar.
Tomato Planting Dates for Missouri
| Start seeds indoors | February 8–15 |
| Last frost (average) | March 22 |
| Transplant outdoors | April 5–15 |
| Expect first harvest | June 4 – June 29 |
| Fall crop start | August 18–28 |
| Fall harvest | October 17 |
| 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.
⚠ Warm-climate gardeners (TX, FL, AZ) can grow TWO crops: spring (Feb–March transplant) and fall (July transplant for October harvest).
Growing Tomatoes in Missouri's Climate
Missouri's moderate Zone 6b climate is well-suited to tomato 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 tomato 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 tomato pests to watch for in Missouri include Tomato Hornworm and Aphids. The first line of defense is companion planting: Basil and Marigold 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.
Tomato Garden Calendar for Missouri
| Month | Task | Notes |
|---|---|---|
| January | — | Dormant season |
| February | Start seeds indoors | Use grow lights; warm soil to 70–75°F for best germination |
| March | Harden off seedlings | Set seedlings outdoors 1–2 hours daily, increasing gradually |
| April | Transplant outdoors | Soil temp must be 60°F+; nighttime lows above 50°F |
| May ← | — | Dormant season |
| June | Peak growth; water 1 inch/week | Monitor for pests daily; stake or support as needed |
| July | Start fall crop seeds | Fall transplants go in 12 weeks before first frost |
| August | Fall crop planting | Transplant or direct sow for fall harvest before frost |
| September | — | Dormant season |
| October | — | Dormant season |
| November | First frost approaches | Harvest remaining tomato; cover plants on frost nights |
| December | — | Dormant season |
Tomato Growing Tips for Missouri Gardeners
- •Bury the stem 2/3 deep when transplanting — roots grow from the buried stem for a stronger plant.
- •Consistent watering prevents blossom end rot and fruit cracking; uneven moisture causes both.
- •Missouri's moderate climate supports succession planting — sow new transplants or seeds every 3 weeks during spring to extend the harvest window into fall.
- •Stop heavy nitrogen once flowers appear — it causes leafy plants with few tomatoes.
Companion Planting for Tomatoes in Missouri
In Missouri's moderate climate, planting tomato with Basil and Marigold helps deter pests and improve soil. Avoid planting near Potato and Fennel, which inhibit tomato growth through root chemistry or shared pest pressure. See the full tomato companion planting guide for the complete list.
Tomatoes 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 tomato in Missouri?
In Missouri (Zone 6b), start tomato seeds indoors around February 8–15 and transplant outdoors around April 5–15 — 2 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 tomato year-round in Missouri?
Not year-round — Missouri's cold season stops tomato production. The tomato season runs March 22 to November 10, roughly 33 weeks. A fall crop extends harvest into late autumn.
What tomato varieties grow best in Missouri?
For Missouri's Zone 6b, Classic mid-season varieties like Better Boy, Big Beef, and Roma perform well across most conditions.
When do I start tomato seeds indoors in Missouri?
Start tomato seeds indoors in Missouri around February 8–15, which is 6 weeks before the state's average last frost of March 22. Use grow lights and keep soil temperatures at 70–75°F for fastest germination.