To make this game friendly to kids of all ages, vary the distance of the grassy "lane" depending on each kid's pumpkin-hurling abilities.
First, make the pins: Attach vinyl sticker numbers to 10 butternut squashes. With painters' tape, cover portions of each squash to create stripes. Fill in stripes using acrylic craft paint, and let dry. Carefully peel off stickers and tape. Designate a lane, and set up the pins, placing lower numbers in front and higher ones in back. Have each player stand about 15 feet away, grip a small pumpkin by the stem, and bowl. (Should the stem fall off after a few tries, players can grab onto the whole pumpkin.) Give everyone two turns, and award each player the number of points on the pins knocked down.