A jack o’lantern pumpkin is a type of pumpkin commonly used for carving during Halloween. The tradition of carving pumpkins for Halloween originated in Ireland and Britain, where people initially carved turnips or other root vegetables. When Irish immigrants came to the United States, they adapted the custom to use pumpkins, which are larger and easier to carve. Jack o’lantern pumpkins are typically large, with a smooth, medium orange skin and shallow ribs, making them ideal for carving. They can weigh between 10 to 18 pounds and are known for their ability to store for several months.