A perfectly ripe spaghetti squash will be firm, and a golden or dark yellow color. It should be quite heavy. Make sure there are no soft spots or any cracks in the skin. Also make sure the stem is firm, dry and there are no moldy spots. An average medium spaghetti squash weighs between 4 to 8 pounds. They are available year-round, with a peak season from early fall to winter. This delicious winter squash is truthfully really tasty and easy to find year round!