
Lazy river, FlowRider, NinjaCross, and the only correct answer in August.
Guide
Baytown has two municipal water parks, one big and one small, and the difference is the whole guide. Tips from people who go: arrive at opening; the parking and the shade both run out by one. Cabanas book online and are worth it for a birthday or for anyone who burns.

Baytown has two municipal water parks, one big and one small, and the difference is the whole guide.
Pirates Bay Water Park. The big one — slides, a lazy river, a wave pool, a kids' structure, cabanas — city-run and priced like it, which is to say cheaper than anything private within an hour. The season opens Memorial Day weekend (this year it opened May 23), runs daily through the school summer, goes to weekends only from mid-August, and runs into September — the 2026 season's last open day was Sunday, September 13, on limited hours. Hours change by week and the calendar card on this page carries them, pulled from the park's own page, so don't trust a search result or last year's memory.
Tips from people who go: arrive at opening; the parking and the shade both run out by one. Cabanas book online and are worth it for a birthday or for anyone who burns. Lockers exist; bring a card. Outside food doesn't come in; the concessions are what they are, so eat at Bocanegra's after. Under-fives are happier at Calypso Cove. Weekday mornings in June, before school lets out everywhere else, are the quietest the park ever is.
Calypso Cove. The small municipal splash park in N.C. Foote Park: a spray pad, a small pool, shade, a pavilion you can rent for a party. Six dollars on a weekday, a little more on weekends. Daily in summer until early August, then weekends until it closes. The toddler park, the cheap afternoon, and the birthday for the under-fives. Bring your own snacks; there isn't much.
Which one. Kids under five: Calypso. Kids five to twelve: Pirates Bay, opening time, all day. Teenagers: Pirates Bay, but they'll want the wave pool and they'll find their friends. Adults without kids: the lazy river on a weekday morning in June is a legitimate use of a vacation day.
The rules that trip people. Both close for lightning and reopen a set time after the last strike — a Gulf-Coast summer afternoon can close them twice, and the ticket doesn't refund for weather. Season passes are the cheaper option by the third visit and they sell in the spring. Swim diapers are required and sold on site. And the season is shorter than you think: weekends only from mid-August, and done by the middle of September.
Getting there. Pirates Bay is on the east side; Calypso Cove is in N.C. Foote Park. Both have their own lots; both lots fill on a hot Saturday. Addresses and the map on each page.
En español. Pirates Bay es el parque acuático grande de Baytown — toboganes, río lento, piscina de olas, cabañas — abierto desde el fin de semana de Memorial Day hasta fines de agosto, solo fines de semana desde mediados de agosto; llegue a la hora de apertura. Calypso Cove en el parque N.C. Foote es el chapoteadero pequeño, $6 entre semana, para los más pequeños. Los dos cierran por rayos; el pase de temporada conviene desde la tercera visita.

Lazy river, FlowRider, NinjaCross, and the only correct answer in August.

The little municipal splash. Dump bucket, zero-entry, $6 on a weekday. Not Pirates Bay.