What are the Water Park opening and closing times? The LEGOLAND California Water Park re-opens on March 16th 2019 To see the most up to date operational hours for LEGOLAND California Water Park, please click HERE! Was this article helpful? Related articles When is LEGOLAND California open? What time do you open today? Can I bring my own food and drink into the attraction? Do I have to pay for a 2 and under? What tickets are included in my hotel package?