When to Plant Watermelon in Texas
Published: April 24, 2026
Texas gardeners in Zone 8a enjoy an extended 41-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 Texas based on your local frost calendar.
Watermelon Planting Dates for Texas
| Start seeds indoors | January 25–February 1 |
| Last frost (average) | February 15 |
| Transplant outdoors | March 1–11 |
| Direct sow outdoors | March 1–11 |
| Expect first harvest | May 10 – May 30 |
| First fall frost (average) | December 1 |
Dates above assume Zone 8a, the most common zone in Texas. Gardeners in cooler Denton (Zone 7b) plant 1–2 weeks later; warmer McAllen (Zone 9b) 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 Texas's Climate
Texas's warm Zone 8a climate gives watermelon more than enough heat — in fact, peak summer heat (95°F+) can shut down fruit set entirely. The solution most Texas 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 Texas-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 Texas 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 Texas
| Month | Task | Notes |
|---|---|---|
| January | Start seeds indoors | Use grow lights; warm soil to 70–75°F for best germination |
| February | Harden off seedlings | Set seedlings outdoors 1–2 hours daily, increasing gradually |
| March | Transplant outdoors | Soil temp must be 65°F+; nighttime lows above 50°F |
| April | — | Off-season |
| May ← | First harvest window opens | Watermelon begins producing 70–90 days after transplant |
| 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 Texas 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.
- •Texas'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 Texas
In Texas'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 Texas
Top cities in Texas — select for city-level frost dates and planting calendars.
Frequently Asked Questions
When should I plant watermelon in Texas?
In Texas (Zone 8a), start watermelon seeds indoors around January 25–February 1 and transplant outdoors around March 1–11 — 2 weeks after the state's average last frost of February 15.
What is the last frost date in Texas?
Texas'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 watermelon year-round in Texas?
Not year-round — Texas's cold season stops watermelon production. The watermelon season runs February 15 to December 1, roughly 41 weeks.
What watermelon varieties grow best in Texas?
For Texas's Zone 8a, consult a local nursery or extension office for watermelon variety recommendations.
When do I start watermelon seeds indoors in Texas?
Start watermelon seeds indoors in Texas around January 25–February 1, which is 3 weeks before the state's average last frost of February 15. Use grow lights and keep soil temperatures at 70–75°F for fastest germination.