Is It Too Late to Plant Watermelon? Last Planting Dates by Zone
You can plant watermelon until about 80 days before your first fall frost. See last planting dates by zone, late-season variety picks, and season timing.
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watermelon planting timing late planting
Is It Too Late to Plant Watermelon?
It is too late to plant watermelon seeds when you have fewer than about 80 warm days left before your first fall frost — roughly 70 to 75 days for a short-season variety to ripen, plus a buffer for cool nights slowing growth. Count backward from your average first frost date: if that math still works, plant today; if it is close, use a transplant instead of seed to reclaim 2 to 3 weeks.
Last Watermelon Planting Dates by Zone
- Zones 3 to 4: Early June. Frost returns by mid September, so late planting is not realistic.
- Zone 5: Mid June with a 70 day variety.
- Zone 6: Late June.
- Zone 7: Early to mid July.
- Zone 8: Mid to late July.
- Zone 9: Early August, and fruit often sets better after the worst heat breaks.
- Zones 10 to 13: Late plantings are routine — August and even September plantings ripen where frost holds off until December or never comes.
These cutoffs assume a short-season variety around 70 to 75 days. Standard 85 to 90 day varieties need about two more weeks of cushion. See the watermelon by zone guide for spring windows and the watermelon plant page for variety details.
Can You Plant Watermelon in July?
Yes, in zone 7 and warmer. Early July plantings work in zones 7 and 8 with a short-season variety. In zones 9 and warmer, all of July works, and in the desert Southwest a July planting timed with monsoon moisture makes an excellent fall crop. In zones 6 and colder, July is past the seed cutoff — use a large transplant or wait for spring. Wherever you are, keep July plantings deeply watered while young vines face the hottest weeks of the year.
If You Are Past the Cutoff
- Buy the largest healthy transplant (young starter plant) you can find rather than sowing seed.
- Choose an icebox variety such as Sugar Baby — these small, refrigerator-sized melons ripen fastest.
- Plant into black plastic mulch for extra soil heat, and keep row cover (a light garden fabric that holds in warmth) ready for early fall cold snaps.
- Water new plantings deeply — midsummer transplants face heat stress while rooting.
- If none of that fits the calendar, plant fast fall crops instead and save the watermelon seed for spring.
When Is Watermelon in Season?
Watermelon season in the United States runs from May through September, peaking in July and August. Southern states such as Florida and Texas ship melons from May; midwestern and northern local melons arrive from late July through September. Home gardens track the same curve: a May planting ripens in August in most zones. So mid summer melons are in season now, even if your own planting window has closed.
Next Steps
Look up your average first frost date, count back 80 days, and decide: plant a short-season variety today, switch to a transplant, or plan for an early start next spring with the watermelon by zone guide.