95-100 days. Cutting into one of these large, 20-35 pound, oblong melons will reveal plenty of firm and tasty yellow fruit with a deliciously sweet flavor. Melons have a dark green rind marked with lighter green stripes. Developed from the very popular red-fleshed Mountain Sweet melon grown in the mid- 1800s by farmers on the East coast, this variety grows in any region with warm summers. Long, warm summers produce the largest watermelons.