Inland Empire
Everything IE
EverythingIE
All IE Parks, Mountains & Lakes
Cucamonga-Guasti Regional Park
🏞️ Regional Park
150 acres

Cucamonga-Guasti Regional Park

Ontario
Dog Friendly
🎣 Fishing
🏊 Swimming
👨‍👩‍👧‍👦 Family

150-acre Ontario county park with swim lagoons, fishing lakes, and waterslides minutes off the 10.

Cucamonga-Guasti Regional Park is a 150-acre San Bernardino County park near LA/Ontario Airport with two swim lagoons, water slides, stocked fishing lakes, and large picnic shelters — a longtime IE family summer staple.

🌟 Why Locals Love It

Closest swim lagoon and slide combo for west-IE families.

What to Expect

Swimmers, anglers, group picnics, lifeguards in summer.

💡 Good to Know Before You Go

Vehicle entry fee + swim fee.

📍 Local Tip

Arrive at opening for the cleanest lagoon water.

Best Time to Visit

May–September for swimming.

Notable Features

Swim lagoons
Water slides
Stocked fishing lakes

Practical Info

800 N Archibald Ave, Ontario, CA 91764

Amenities

Restrooms
Showers
Picnic Area
Playground
Parking
Swimming Area
Fishing Dock
BBQ Grills
Shade
Verified Official Source
View Official Page →

Explore Everything IE

Everything IE is your premium guide to the Inland Empire — Riverside County and San Bernardino County. Events, restaurants, parks, schools, mountains, lakes, sports, and more — sourced from official departments and trusted institutions, curated for the people who call the IE home. Part of the Everything California network.