There are no fees for parking or visiting the park grounds. A per person charge applies for Castle tours. The gate at Gillette Castle State Park is open at 8:00 am, and closes at sunset year round.
Heritage Passport allows a family (2 adults and up to 4 children) unlimited admittance to three facilities - Dinosaur, Fort Trumbull and Gillette Castle State Parks. The Heritage Passport costs $67.00 and can be purchased at any one of the three facilities.