Watermelon plants should not go into the ground until the weather is warm and all danger of frost has passed, usually April or May. Watermelon plants grow best when daytime temperatures reach 70 to 80 degrees F and nighttime temperatures reach 65 to 70 degrees F.
About this Author
D.M. Cameron was a journalist and editor for wire services, newspapers and magazines for more than 20 years. In addition to editing and ghost-writing non-fiction books, Cameron now writes for several websites and trade journals. Cameron's degrees include a Bachelor of Arts in journalism from Penn State.