California note
Cucamonga-Guasti gives Ontario a lake-and-picnic park
Cucamonga-Guasti Regional Park is a 150-acre urban park in Ontario with two fishing lakes, picnic shelters, splash-pad space, and event areas.
Ontario has plenty of busy edges, but Cucamonga-Guasti gives the city a softer outdoor stop. It is a 150-acre park in town. It can work for a lunch break, a family picnic, or a fuller park day.
The park has two fishing lakes, picnic tables, covered group shelters, barbecue grills, and splash-pad space. The lakes are stocked in season, with trout listed from November to April and catfish from May to September. Fishing there requires a California fishing license.
It is also built for gatherings. The park has large and small covered shelters, plus picnic tables and barbecue grills around the grounds. That makes it useful for the kind of family day where some people fish, some sit, and kids need room to move.
Check ahead before making plans. Swim schedules, lake notices, and shelter reservations can change the day. It is easy to underestimate this park until you see how much it can hold.
Where to see it
Cucamonga-Guasti Regional Park in Ontario
Sources
Sources for this story
Reviewed June 30, 2026
Public sources for the places, events, and details above.
Connected places
Open the local directory
Related notes
Related California notes
Ontario Motor Speedway Park keeps a race-track name in the neighborhood
Ontario Motor Speedway Park is a neighborhood park named for the former Ontario Motor Speedway, which closed after the 1980 race season.
Read next →Graber Olive House keeps Ontario's farm roots close
Graber Olive House began from an early Ontario Model Colony farm lot, grew into a long-running olive business, and still helps the city remember its agricultural side.
Read next →Ontario once had a mule car that coasted downhill
Ontario's early Euclid Avenue line used mules to pull riders uphill, then let the mules ride a trailer back down while gravity did the easy part.
Read next →