24 parks in Illinois with outdoor water-park areas, from 23 operators. Outdoor and indoor-plus-outdoor water parks. Outdoor areas are seasonal; many close after Labor Day or by early October and publish next season’s dates in spring.
The site says Splash Valley closed for the 2026 season on Sunday, August 30, 2026. Park district outdoor water park in Kankakee, Illinois, with body and tube slides and a kids play structure. Daily admission or a season pass; the 2026 season ended August 30.
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View park detailsThe published 2026 season ended September 7, 2026. Check the official calendar for the next season. Park district outdoor aquatic center in Cary, Illinois, with body flume slides, a drop slide and diving boards. It runs a summer season, and daily admission costs less for district residents.
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View park detailsThe published 2026 season ended September 7, 2026. Check the official calendar for the next season. Park district water park in Vernon Hills, Illinois, with slides, a lazy river, pools and a sprayground. Open in summer with a daily fee or a season pass; residents pay less.
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View park detailsPark district outdoor water park in West Chicago, Illinois, open in summer. Daily admission is sold, with lower prices for district residents and after 5pm.
Daily $12 resident / $15 non-res
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