When to Plant Watermelon in Michigan: Best Months and Last Planting Date
Plant watermelon in Michigan from late May to early June, once soil hits 65°F. See region dates, short-season variety picks, and the too-late cutoff.
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When to Plant Watermelon in Michigan
Plant watermelon in Michigan from late May to early June, after the last frost and once soil has warmed to at least 65 degrees F. Michigan's season is short for watermelon, so variety choice matters as much as the date. Southern Michigan warms first, while northern Lower Michigan and the Upper Peninsula may wait until mid June.
Southern Michigan, roughly south of Grand Rapids, can usually plant in late May. Central and west Michigan fit late May to early June — lake-cooled areas near the shoreline warm more slowly. Northern Lower Michigan and the Upper Peninsula often need early to mid June, and short-season varieties are essential there. Use the watermelon by zone guide with your local frost date.
Michigan Timing Notes
- Start seeds indoors 3 to 4 weeks before your outdoor date — transplants (young starter plants) are strongly recommended statewide.
- Harden off transplants — set them outside a little longer each day for about a week — before planting.
- Use black plastic mulch and row cover (a light garden fabric that holds in warmth); both speed vines significantly in Michigan's cool springs.
- Choose a 70 to 75 day icebox variety (a small, refrigerator-sized melon) such as Sugar Baby.
Is It Too Late to Plant Watermelon in Michigan?
In southern Michigan, a 70 day short-season variety transplanted by mid to late June can still ripen before the typical early to mid October frost. Farther north, mid June is the realistic cutoff. Past those dates, save the seed for next spring — Michigan falls cool down too fast for late plantings to catch up.
Next Steps
Look up your county last frost date, warm the soil with black plastic, and transplant a short-season variety in late May or early June. In Michigan, a warm start and a fast variety matter more than anything else.