Splash Island Family Waterpark
✓ Last confirmed for the 2026 season
Where: 651 Vestal Rd., Plainfield, Indiana
Season: Late May through early September
Hours: Varies; check Plainfield Parks schedule
Cost: free
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Plainfield's outdoor waterpark steps up from splash pad to full aquatic center, with zero-depth entry, interactive spray structures and slides behind a paid gate. It is the west side's main upgrade option when a free pad no longer cuts it.
What's on site. OpenStreetMap maps parking at this location. No public toilets are mapped here — worth knowing before you commit to an afternoon.
When to go. Peak summer highs in Plainfield average 85°F — warm enough for a splash pad through most of the season without being punishing at midday.
How long it's open. Roughly 21 weeks a year, from May to September. Seasons shift year to year and municipal pads often close early for maintenance, so check before a long drive.
If this one's closed or packed
Splash pads close for maintenance, run short seasons and fill up on hot weekends. There are 2 other pads within 5 miles and 9 within 15. These are the ones worth the drive — ranked by shade, toilets and cost first, then by how close they are: