Lake Picnics in Napa & Sonoma: Shade, Swimming & Wine Rules

The best lake picnics in Napa and Sonoma are at Lake Berryessa's Oak Shores Day Use Area, where tables, grills and swimming beaches line a string of coves, and at Spring Lake Regional Park in Santa Rosa, with grills at tables all around the water and a lifeguarded swim lagoon in summer. For free tables on a shady lawn after a day of tasting, head to Lake Sonoma's Warm Springs area at the top of Dry Creek Valley.

The rule people miss is glass. Wine is legal at Oak Shores and nearby Smittle Creek, but glass containers are banned there, and every Santa Rosa city park bans glass too, including Howarth Park on Lake Ralphine. Bring wine in cans, a box or a plastic carafe. Here's how each lake compares, as of September 2026.

Lake picnic spots at a glance

Rules to know before you pack

• Glass: banned at Oak Shores and Smittle Creek (Napa County Code §12.08.030(A)(23)) and in every Santa Rosa city park (City Code §13-24.070). Sonoma County regional parks, Spring Lake included, have no glass ban.
• Howarth's clock: alcohol is banned there from 6 a.m. to 5 p.m. on weekdays (§13-24.050), so it's legal on weekday evenings until sunset and all day on weekends and holidays.
• "Allowed unless posted": Lake Sonoma (36 CFR 327.12) and Trione-Annadel (14 CCR §4326) allow alcohol unless a ban is posted. A sign at the site always wins.
• Fire days: no charcoal or wood fires at Lake Berryessa during Red Flag Warnings, even in the grills, or in Sonoma County parks on Red Flag, high-wind and Spare the Air days. Trione-Annadel allows no fires or stoves at all.

Lake Berryessa: Oak Shores, Smittle Creek and Putah Canyon

The Bureau of Reclamation runs two big day-use areas on Berryessa's west shore, off Knoxville Road, and says the water reaches up to 75 degrees in summer.

Oak Shores, about 8 miles up Knoxville Road from Highway 128, is the pick: tables and grills around beaches such as Acorn Beach, Foxtail Flat and Coyote Beach, with restrooms and drinking water. Swimming is at your own risk. For guaranteed shade, book one of six covered group shelters on Recreation.gov ($33 a day, up to 50 people; not bookable on summer holiday weekends). Arrive by noon or the shelter is released; unbooked ones are first-come. Parking is $5 a day. It's open 7:30 a.m. to 8 p.m. in summer (5 p.m. in winter) and fills up on summer weekends and holidays, so arrive before noon.

Smittle Creek, just north, is smaller and quieter, with restrooms and short trails and stairs down to little coves, but no reservable shelters. It's open in daylight, and it's unclear whether the $5 fee applies, so bring $5 or the Recreation.gov app. At both areas, alcohol is allowed but glass isn't, dogs must be leashed and stay out of restrooms, fires go only in the grills provided, and county code bans tying hammocks to trees or tables.

Putah Canyon, a concession-run campground and marina on the northwest shore, has a first-come day-use picnic area near the launch ramp. Peak-season (May to September) day use is $20 per car for up to four people, paid through the Recreation.gov app, and leashed dogs are $5 each. Day visitors can swim, and the camp store sells snacks and rents kayaks, paddleboards and pontoons. The concessionaire hasn't published an alcohol rule, so call (707) 966-9051 before packing wine.

If you come in on Highway 128 through Sage Canyon, Nichelini Family Winery welcomes picnics at shaded tables in its homestead backyard, with no picnic fee (tastings $30–$60). Skip Lake Hennessey, the City of Napa's reservoir along the highway: county code bans swimming, wading and picnicking on the shore between the lake and the road, and no public picnic area could be confirmed there.

Lake Sonoma: Warm Springs Recreation Area

Warm Springs, about 11 miles from Healdsburg, is Lake Sonoma's main picnic ground. Free, first-come tables dot a big mowed lawn with shade trees, and six roofed group shelters with large grills (about 50 to 75 people each) rent for $50 to $75 a day on Recreation.gov, up to a year ahead. There's a playground and restrooms, with the Visitor Center and fish hatchery across the road.

The lawn sits below the dam, not on the shore, so plan a shady lawn picnic rather than a beach day; a nature trail climbs the ridge for views over the lake. Alcohol is allowed unless an area is posted. Dogs need a leash under 6 feet and must stay out of restrooms, playgrounds and swim beaches. Fires go only in the grills, amplified music isn't allowed, and the area is open for day use year-round.

Spring Lake and Howarth Park, Santa Rosa

These east-side neighbors are linked by trails but follow different rules.

Spring Lake Regional Park, a county park, is the region's most complete lake picnic. Tables with barbecue grills are spread around a 72-acre reservoir. The swim lagoon has a sandy beach and redwood-shaded lawns, free lifeguarded swimming from Memorial Day weekend to Labor Day, and a café selling burgers, tacos, ice cream and beer (seasonal hours). Alcohol is allowed; parking is $8, or $12 in summer. Leashed dogs are welcome except at the lagoon, which hosts off-leash "Water Bark" weekends after the season (the last 2026 dates are September 26–27 and October 3–4). Six group areas for 25 to 150 people cost $75, or $130 for more than 99, plus parking, booked 3 days to 12 months ahead. Use the Violetti Road entrance: the Newanga boat-ramp lot is being repaved through October 2026 and fully closes October 19–22.

Howarth Park, a city park, wraps around Lake Ralphine, a small lake for fishing and boating, and Santa Rosa's park rules ban bathing and wading without a permit. Tables with barbecues are spread across the lawns, and entry and parking are free. Eight reservable sites, including a 90-person gazebo site, cost $80 to $160 ($105 to $185 for non-residents), booked 10 to 365 days ahead. Alcohol follows the clock above and is never allowed in glass. The snack bar is closed, the boathouse closes for the season on September 27, 2026, and the kids' rides close for winter from October 26, 2026 to March 5, 2027.

More lakeside picnic parks

• Riverfront Regional Park, between Windsor and Healdsburg, has tables in a cool redwood grove by the parking lot, a short walk from two former gravel-pit lakes for fishing and non-motorized boats (no swimming). As of September 2026, the back of the Lake Benoist loop trail is impassable.
• Trione-Annadel State Park in Santa Rosa is for hikers: tables are scattered along the shore of 26-acre Lake Ilsanjo, about a one-hour, 2.5-mile climb from the Channel Drive lot ($8 per car). Dogs aren't allowed on the trails, the lakeside meadows get little shade, and water is only available near the Visitor Center and main lot.
• Foothill Regional Park in Windsor has tables and benches in oak woodland around three small fishing ponds ($8 parking). There's no designated swimming, alcohol is allowed, and the park may close on high-wind or storm days.
• Tolay Lake Regional Park near Petaluma surrounds a seasonal lake whose bed is closed to the public; picnics center on Willow Pond, with a 14-table group site ($75). The new Gathering Area next to it is closed for construction through October 2026.

Where to buy picnic food on the way

• Lake Berryessa: stock up in the valley; the nearest delis are a winding drive away. Oakville Grocery on Highway 29 opens at 7 a.m. daily, and in St. Helena, Sunshine Foods has a full deli and stays open until 8 p.m., and Giugni's Deli makes sandwiches to order.
• Lake Sonoma: Dry Creek General Store, about 15 minutes from Warm Springs on Dry Creek Road, makes deli sandwiches (open 7 a.m. to 4 p.m., until 5 p.m. Friday and Saturday). Big John's Market in Healdsburg, open 7 a.m. to 8 p.m. daily, has made-to-order sandwiches, salad and hot bars.
• Santa Rosa and Windsor: Canevari's Deli, an Italian deli since 1929, is about 10 minutes from Spring Lake and Howarth (closed Sundays). Oliver's Market has four stores, including one in Windsor for Riverfront and Foothill, all open 7 a.m. to 10 p.m. with online deli ordering.