Lawn Guardian

When to Plant Watermelon

Citrullus lanatus

fruitZones 3–11intermediate

Classic summer fruit requiring heat, space, and patience. Smaller icebox varieties work for limited spaces. Nothing beats the taste of a sun-warmed homegrown melon.

Planting calendar

Start seeds indoors

3 weeks before your last spring frost.

Direct sow / transplant

2 weeks after your last spring frost.

Needs very warm soil (70°F+) and a long warm season; use black plastic mulch to warm soil

Spacing & harvest

Companion planting

Plant near

Keep away from

Get watermelon planting dates for your exact zone

Lawn Guardian turns this guidance into a schedule timed to your USDA zone and this week's actual weather — and adapts every time you log what you've done.

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Sources: Purdue University Turfgrass Science: Use Growing Degree Days to Better Time Your Applications · University of Missouri Extension: Cool-Season Grasses: Lawn Maintenance Calendar · University of Minnesota Extension: Pre-emergent Herbicides for Crabgrass Control in Lawns