Lake Gregory Regional Park is a serene mountain retreat in Crestline, California, beloved for its swimming beach, pedal boats, and forested lakeside trails.
Lake Gregory was created in the 1930s when a dam was built on City Creek, forming the reservoir that now anchors the community of Crestline in the San Bernardino Mountains. San Bernardino County later developed the surrounding land into a regional park, and today it serves as one of the most accessible mountain recreation areas for residents of the Inland Empire and greater Los Angeles.
The park centers on a sandy swimming beach open during summer months, with a designated swim area, lifeguards on duty, and a water slide that delights younger visitors. Beyond the beach, you can rent pedal boats and explore the quiet coves along the shoreline. A paved and dirt path circles the entire lake, offering an easy two-mile loop through fragrant pines with views of the water at nearly every turn. Fishing is permitted year-round, and the lake is regularly stocked with trout, making it a reliable spot for anglers of all skill levels.
The surrounding forest sets a peaceful tone that feels genuinely removed from the flatlands below. A short drive up the mountain leads to the Heaps Peak Arboretum Day Use Area, where interpretive trails wind through old-growth conifers and native plantings. The town of Crestline itself has a small-town character, with local cafes and shops lining Lake Drive just steps from the park entrance.
Lake Gregory Regional Park earns its place as a mountain-day classic: accessible, scenic, and genuinely refreshing in every season.
Visit on a weekday morning in summer to secure a good spot on the sandy beach before crowds arrive.
Try renting a pedal boat or kayak to explore the lake from the water and enjoy the mountain scenery from a different angle.
Bring layers, even in July, as temperatures at 4,500 feet can drop noticeably by late afternoon.
Walk the full loop trail around the lake for a peaceful, roughly two-mile stroll through ponderosa pine forest.
Pack your own lunch and claim one of the shaded picnic tables near the water early, as they fill quickly on warm weekends.

Rent a Duffy boat and cruise Lake Gregory for 1–2 hours
Rent a paddleboard and explore Lake Gregory in 1–2 hours
Rent a canoe and explore 84 acres of Lake Gregory in 1–2 hours
Paddle a tandem kayak and explore scenic Lake Gregory for up to two hours.
Paddle across scenic Lake Gregory and enjoy flexible rental times for ages 13 and up.
Explore Lake Gregory’s 84-acre lake by row boat
Swim, splash, and slide with one Lake Gregory day pass
Lakefront cabana with shade, swimming, and service
Swim and splash at Lake Gregory’s beach and Zero-Depth Splash Pad