Sgt. Volkin is the author of The Ultimate Basic Training Guidebook. The Ultimate Basic Training Guidebook is available (as of this writing)) in both book and e-book format at www.ultimatebasictrainingguidebook.com.
Step 1. Plant watermelon seed during spring once all danger of frost has passed in a location that receives full sunlight. Spread 3 inches of organic manure over the planting site and use a garden tiller to incorporate it into the soil to increase drainage and fertility.
1 Watermelon vines are very tender and should not be transplanted until all danger of frost has passed. (To be safe, wait at least two weeks past your last frost date.)  If you are in a cooler zone, start seeds indoors about a month before transplanting.