Soak City Opening Day 2025. Soak city is knott's berry farm premier waterpark and is included with gold and prestige season passes. Valleyfair, the region’s premier amusement park, will open its soak city waterpark on saturday, may 27, at 11 a.m.

Visiting knott’s berry farm or knott’s soak city this season? Kings island has announced that they’ll be making upgrades to their soak city water park in 2025.