When to Plant Sweet Corn in Mississippi
Published: April 24, 2026
Mississippi gardeners in Zone 8a enjoy an extended 41-week growing season for sweet corn. Warm-climate gardeners can grow two sweet corn crops — a spring planting and a fall planting — with summer heat as the main challenge to work around. This guide gives exact dates for Mississippi based on your local frost calendar.
Sweet Corn Planting Dates for Mississippi
| Start seeds indoors | Year-round |
| Last frost (average) | February 15 |
| Direct sow outdoors | February 22–March 4 |
| Expect first harvest | April 28 – May 23 |
| First fall frost (average) | December 1 |
Dates above assume Zone 8a, the most common zone in Mississippi. Gardeners in cooler Jackson (Zone 8a) plant 1–2 weeks later; warmer Gulfport (Zone 8b) can plant 1–2 weeks earlier.
⚠ Direct sow corn after last frost when soil reaches 60°F. Plant in blocks of at least 4 rows for pollination. Succession plant every 2 weeks for continuous harvest.
Growing Sweet Corn in Mississippi's Climate
Mississippi's warm Zone 8a climate gives sweet corn more than enough heat — in fact, peak summer heat (95°F+) can shut down fruit set entirely. The solution most Mississippi gardeners use is a two-season approach: a spring crop planted early, a harvest break during peak summer, and a fall crop planted July through August for October and November harvest.
Variety selection matters more in warm climates than most gardeners realize. Choose heat-tolerant varieties bred for Mississippi-like conditions — local extension offices and nurseries stock these specifically. Afternoon shade cloth during July and August can be the difference between a working fall crop and total flower drop.
Common sweet corn pests to watch for in Mississippi include Corn Earworm and Cutworm. The first line of defense is companion planting: Bush Bean and Pumpkin 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.
Sweet Corn Garden Calendar for Mississippi
| Month | Task | Notes |
|---|---|---|
| January | — | Off-season |
| February | Direct sow seeds | Sow seeds 1/4–1/2 inch deep, 12 inches apart |
| March | — | Off-season |
| April | First harvest window opens | Sweet Corn begins producing 65–90 days after transplant |
| May ← | — | Off-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 | — | Off-season |
| September | — | Off-season |
| October | — | Off-season |
| November | — | Off-season |
| December | First frost approaches | Harvest remaining sweet corn; cover plants on frost nights |
Sweet Corn Growing Tips for Mississippi Gardeners
- •Plant in blocks of at least 4 rows × 4 plants, not single rows — corn is wind-pollinated and single rows produce deformed ears.
- •Sow successively every 2 weeks until 90 days before first fall frost for continuous harvest through summer.
- •Mississippi's summer heat shuts down sweet corn flowering at 95°F+. Choose heat-tolerant varieties and use shade cloth from mid-June through August to preserve fruit set.
- •Side-dress with nitrogen when plants are knee-high and again at tasseling — corn is an extremely heavy feeder.
Companion Planting for Sweet Corn in Mississippi
In Mississippi's warm climate, planting sweet corn with Bush Bean and Pumpkin helps deter pests and improve soil. Avoid planting near Tomato and Celery, which inhibit sweet corn growth through root chemistry or shared pest pressure. See the full sweet corn companion planting guide for the complete list.
Sweet Corn Planting Dates by City in Mississippi
Top cities in Mississippi — select for city-level frost dates and planting calendars.
Frequently Asked Questions
When should I plant sweet corn in Mississippi?
In Mississippi (Zone 8a), start sweet corn seeds indoors around Year-round and transplant outdoors around null — 0 weeks after the state's average last frost of February 15.
What is the last frost date in Mississippi?
Mississippi's average last frost date is February 15 in the state's most common Zone 8a. 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 sweet corn year-round in Mississippi?
Not year-round — Mississippi's cold season stops sweet corn production. The sweet corn season runs February 15 to December 1, roughly 41 weeks.
What sweet corn varieties grow best in Mississippi?
For Mississippi's Zone 8a, consult a local nursery or extension office for corn variety recommendations.
When do I start sweet corn seeds indoors in Mississippi?
Sweet corn does not need indoor starting in Mississippi — direct sow around February 22–March 4 once soil reaches 60°F. Indoor starting is not recommended for this crop because sweet corn transplants poorly.