Are you really open one day a week. I would really like to come but cant do those hours. Why only open on Sundays? Do I have to make a reservation if I come?

No, you have a misunderstanding here. They are open Wednesday through Sunday during their season. Check their website for hours. They are however closed entirely over the winter, from early December through about April 1. You don't need to make a reservation unless you are part of a large group such as a school group in a bus or a group of 12 or more in cars

Hi Diane! We are open Wedesday, Thursday, Friday, Saturday, and Sunday (closed Monday and Tuesday). April through the first week in December. See our website for hours and additional information: https://stormking.org/visit/ Thank you! Storm King

No reservations, but definitely get there early to enjoy all it has to offer.

No need reservation. Bring water and comfortable shoes. The have trolley that bring a tours around the park and a information of some important sculpture. But you can off the trolley in any stop and walk around the park that is very extended y take picture to close. Approximately you need to hours to see all and enjoy the place.