When to Plant Watermelon in Louisiana
Published: April 24, 2026
Louisiana gardeners in Zone 8b enjoy an extended 45-week growing season for watermelon. Warm-climate gardeners can grow two watermelon crops — a spring planting and a fall planting — with summer heat as the main challenge to work around. This guide gives exact dates for Louisiana based on your local frost calendar.
Watermelon Planting Dates for Louisiana
| Start seeds indoors | January 11–18 |
| Last frost (average) | February 1 |
| Transplant outdoors | February 15–25 |
| Direct sow outdoors | February 15–25 |
| Expect first harvest | April 26 – May 16 |
| First fall frost (average) | December 15 |
Dates above assume Zone 8b, the most common zone in Louisiana. Gardeners in cooler New Orleans (Zone 8b) plant 1–2 weeks later; warmer Shreveport (Zone 8a) can plant 1–2 weeks earlier.
⚠ Plant watermelon 2 weeks after last frost when soil exceeds 65°F. Needs 70–90 frost-free days. Direct sow in warm climates; start indoors in Zone 4–5.
Growing Watermelon in Louisiana's Climate
Louisiana's warm Zone 8b climate gives watermelon more than enough heat — in fact, peak summer heat (95°F+) can shut down fruit set entirely. The solution most Louisiana 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 Louisiana-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 watermelon pests to watch for in Louisiana include Cucumber Beetle and Squash Bug. The first line of defense is companion planting: Corn and Radish 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.
Watermelon Garden Calendar for Louisiana
| Month | Task | Notes |
|---|---|---|
| January | Start seeds indoors | Use grow lights; warm soil to 70–75°F for best germination |
| February | Transplant outdoors | Soil temp must be 65°F+; nighttime lows above 50°F |
| March | — | Off-season |
| April | First harvest window opens | Watermelon begins producing 70–90 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 watermelon; cover plants on frost nights |
Watermelon Growing Tips for Louisiana Gardeners
- •Plant on a warm, sunny slope or use black plastic mulch to maintain soil temperature above 70°F all season.
- •Give each plant 6 feet of space — watermelon vines sprawl and need room to run.
- •Louisiana's summer heat shuts down watermelon flowering at 95°F+. Choose heat-tolerant varieties and use shade cloth from mid-June through August to preserve fruit set.
- •Water deeply twice a week during fruit development; reduce watering as melons near ripeness to concentrate sugars.
Companion Planting for Watermelon in Louisiana
In Louisiana's warm climate, planting watermelon with Corn and Radish helps deter pests and improve soil. Avoid planting near Cucumber and Potato, which inhibit watermelon growth through root chemistry or shared pest pressure. See the full watermelon companion planting guide for the complete list.
Watermelon Planting Dates by City in Louisiana
Top cities in Louisiana — select for city-level frost dates and planting calendars.
Frequently Asked Questions
When should I plant watermelon in Louisiana?
In Louisiana (Zone 8b), start watermelon seeds indoors around January 11–18 and transplant outdoors around February 15–25 — 2 weeks after the state's average last frost of February 1.
What is the last frost date in Louisiana?
Louisiana's average last frost date is February 1 in the state's most common Zone 8b. 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 watermelon year-round in Louisiana?
Not year-round — Louisiana's cold season stops watermelon production. The watermelon season runs February 1 to December 15, roughly 45 weeks.
What watermelon varieties grow best in Louisiana?
For Louisiana's Zone 8b, consult a local nursery or extension office for watermelon variety recommendations.
When do I start watermelon seeds indoors in Louisiana?
Start watermelon seeds indoors in Louisiana around January 11–18, which is 3 weeks before the state's average last frost of February 1. Use grow lights and keep soil temperatures at 70–75°F for fastest germination.