When to Plant Eggplant in Missouri
Published: April 24, 2026
Missouri gardeners in Zone 6b have a 33-week growing season for eggplant (March 22 to November 10). The moderate climate supports a full warm-season crop plus a single main harvest. This guide gives exact dates for Missouri based on your local frost calendar.
Eggplant Planting Dates for Missouri
| Start seeds indoors | January 18–25 |
| Last frost (average) | March 22 |
| Transplant outdoors | April 12–22 |
| Expect first harvest | June 16 – July 1 |
| 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.
⚠ Start eggplant indoors 8–10 weeks before last frost — same timing as peppers. Transplant 2–3 weeks after last frost when soil is above 60°F. Needs heat and full sun. Does not tolerate cold — protect from temps below 50°F.
Growing Eggplant in Missouri's Climate
Missouri's moderate Zone 6b climate is well-suited to eggplant 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 eggplant 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 eggplant pests to watch for in Missouri include Flea Beetle and Colorado Potato Beetle. The first line of defense is companion planting: Pepper and Bean 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.
Eggplant Garden Calendar for Missouri
| Month | Task | Notes |
|---|---|---|
| January | Start seeds indoors | Use grow lights; warm soil to 70–75°F for best germination |
| February | — | Dormant season |
| 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 | Continue care | Consistent watering; remove yellow leaves |
| August | — | Dormant season |
| September | — | Dormant season |
| October | — | Dormant season |
| November | First frost approaches | Harvest remaining eggplant; cover plants on frost nights |
| December | — | Dormant season |
Eggplant Growing Tips for Missouri Gardeners
- •Use a heat mat during germination — eggplant seeds need 24–27°C soil to sprout reliably.
- •Protect transplants from cold spring nights — temperatures below 10°C halt growth for weeks.
- •Missouri's moderate climate supports succession planting — sow new transplants or seeds every 3 weeks during spring to extend the harvest window into fall.
- •Use stakes or small cages — eggplant stems bend or break under the weight of mature fruit.
Companion Planting for Eggplant in Missouri
In Missouri's moderate climate, planting eggplant with Pepper and Bean helps deter pests and improve soil. Avoid planting near Fennel and Brassicas, which inhibit eggplant growth through root chemistry or shared pest pressure. See the full eggplant companion planting guide for the complete list.
Eggplant 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 eggplant in Missouri?
In Missouri (Zone 6b), start eggplant seeds indoors around January 18–25 and transplant outdoors around April 12–22 — 3 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 eggplant year-round in Missouri?
Not year-round — Missouri's cold season stops eggplant production. The eggplant season runs March 22 to November 10, roughly 33 weeks.
What eggplant varieties grow best in Missouri?
For Missouri's Zone 6b, consult a local nursery or extension office for eggplant variety recommendations.
When do I start eggplant seeds indoors in Missouri?
Start eggplant seeds indoors in Missouri around January 18–25, which is 9 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.