Trip ideas while visiting Ontario in California
Cucamonga-Guasti Regional Park is a lush 150-acre oasis in Ontario, California, centered around two sparkling fishing lakes surrounded by manicured lawns and mature shade trees. The park sits just minutes from Ontario International Airport and provides a refreshing contrast to the surrounding urban landscape of the Inland Empire. Families, anglers, and outdoor enthusiasts flock to this popular regional park for its combination of water-based recreation, picnic facilities, and family-friendly amenities. The park is operated by the San Bernardino County Regional Parks Department and has served the community for decades as a cherished green gathering space.
The land that now encompasses Cucamonga-Guasti Regional Park was part of the historic Cucamonga Rancho, a Mexican land grant established in 1839 and awarded to Tiburcio Tapia, a prominent Californio official. The rancho covered approximately 13,000 acres and was one of the earliest settlements in the Inland Empire, known for its vineyards and agricultural production. During the late 19th century, the area became renowned for its citrus orchards and vineyards, with the Guasti name attached through Secondo Guasti, an Italian immigrant who founded the Italian Vineyard Company and established one of the largest winemaking operations in the world at the time. The park evolved from a simple fishing destination into a comprehensive regional park that hosts community celebrations, family reunions, and cultural festivals throughout the year.
Fishing is the premier activity at Cucamonga-Guasti Regional Park, with the park’s two lakes regularly stocked with rainbow trout during the cooler months and catfish throughout the summer season. A California state fishing license is required for anyone age 16 and older, making it accessible for families with children who can fish under adult supervision without their own permits. The park features multiple playgrounds with modern equipment that keep children entertained for hours, and splash pads operate during the warmer months as a refreshing way for kids to cool off. Pedal boat and rowboat rentals offer visitors a chance to get out on the water and enjoy the lakes from a different perspective, with views of the surrounding San Gabriel Mountains creating memorable photo opportunities from the middle of the lake.
The park’s twin lakes form the visual centerpiece of the landscape, their calm surfaces reflecting the mountains that rise dramatically to the north. On clear days, snow-capped peaks provide a stunning backdrop that seems almost surreal above the urban Inland Empire setting. The lakes attract a variety of waterfowl including ducks, geese, and herons, delighting birdwatchers and photographers who visit to capture wildlife. Weeping willows drape gracefully over the water’s edge while palm trees and California sycamores provide a distinctly Southern California landscape. Landscaping teams maintain seasonal flower beds that add vibrant color throughout spring and summer months.
The park offers picnicking facilities that rank among the best in the Inland Empire. Shaded picnic areas with tables and barbecue grills are scattered throughout the grounds, with larger group pavilions available for reservation. The park’s walking paths loop around the lakes and connect various activity areas, providing pleasant routes for casual strolls or brisk exercise walks. The flat, paved surfaces make the paths accessible for strollers and wheelchairs, ensuring all visitors can enjoy the scenery. Open grassy areas provide space for informal sports, from frisbee and soccer to kite-flying on breezy days, and the generous open space encourages visitors to linger and make a full day of their visit rather than rushing through.
The swimming pool complex operates from Memorial Day through Labor Day, featuring a large main pool, a diving area, and a children’s wading pool with lifeguard supervision throughout operating hours. The pool consistently draws families from across the Inland Empire seeking a safe and well-maintained swimming destination. Special events bring additional energy to the grounds throughout the year, including holiday celebrations, community fishing derbies, and seasonal festivals. The park’s picnic pavilions and group areas serve as venues for birthday parties, corporate gatherings, and family reunions, with reservable spaces ranging from small shaded areas to large pavilions that accommodate hundreds of guests. Advance reservations are recommended for weekend dates during peak season.
The park operates year-round but the experience varies significantly by season. Spring brings temperatures averaging 78°F, with the landscape at its greenest and trout fishing peaking during the spring stocking season. Weekend crowds begin building as weather improves from March through May. Summer arrives with highs around 94°F and the full slate of water activities, including pool, splash pads, and pedal boats all operating at capacity. Visitors should arrive early to secure prime picnicking spots and avoid the midday heat. The park stays open later during summer months for pleasant evening visits when temperatures moderate. Fall offers comfortable temperatures averaging 85°F and reduced crowds after Labor Day, with catfish stocking continuing into early fall and golden afternoon light creating beautiful photography conditions. Winter provides the most peaceful experience at 66°F, with cool temperatures keeping crowds minimal and creating a serene atmosphere ideal for contemplative walks. Winter trout stocking attracts dedicated anglers, and mountain views are often at their most dramatic against crisp winter skies.