How To Build A Pitcher's Mound. Cut the plywood to the size that fits the length and width of your frame. This will be filled with mound material and will prevent it from creeping past the edge of the mound circle during construction and compaction.
Drive a stake into the ground with a mallet at the center point of the pitcher’s mound. Building a portable pitching mound (for under $100) it's a curse being an engineer. Since the pitcher’s mound is exactly that, a mound, it is not perfectly flat.
By building a pitching mound in your backyard, you will always be able to take some time out of your busy day to enjoy a catch with your son or daughter.
If building a fully clay mound, dump clay and spread to shape. Your logical side won't let you buy anything that you can make. So you now have two pieces of plywood, three ten foot boards and a six footer. Challenges of building a portable pitching mound;