Foster City's lagoon-side parks are genuinely underused for birthday parties — Boothbay's covered pavilion, volleyball, basketball, and playground package is one of the strongest all-in-one outdoor party options on the Peninsula. Leo Ryan Park's gazebo on the lagoon is the most scenic option within 10 miles. Picnic areas are now available to rent online for most of Foster City's reservable parks through the city's WebTrac system at registration.fostercity.org — no more in-person-only bookings for most locations. We pulled together the five Foster City parks where you can book a covered or open-air party area and actually guarantee your spot before you print the invites.
1. Boothbay Park (Foster City)
Location: 300 Boothbay Ave, Foster City, CA 94404
Foster City👶 Best for all ages💲 Free🚗 2.3 miPavilion: Covered Picnic Pavilion · Amenities: covered picnic pavilion, BBQ pits, playground, sand volleyball pit, basketball court, 4 tennis courts, small amphitheater seating area, restrooms on-site
Reserve Boothbay Park pavilion →
Foster City's only covered birthday pavilion — Boothbay Park has sand volleyball, basketball, playground, and BBQs in an 11-acre park. Boothbay at 300 Boothbay Ave is the Peninsula's answer to an all-in-one outdoor party: covered pavilion for weather protection, BBQ pits on-site, sand volleyball, basketball, playground, four tennis courts, small amphitheater, and restrooms. Reserve the pavilion in-person at The Vibe Teen Center (670 Shell Blvd) or by calling (650) 286-3374.
Good to know: covered picnic pavilion, playground, sand volleyball, basketball court, 4 tennis courts, BBQ pits, amphitheater seating, restrooms, open lawn.
Parent tip: Boothbay's covered pavilion is the only fully covered birthday party structure in Foster City's parks system — if there's any chance of afternoon fog or drizzle (which on the Peninsula is real year-round), this is the one pick with a roof over it. Book the pavilion early; it's the most sought-after outdoor party spot in the city.
2. Leo J. Ryan Park — Gazebo (Foster City)
Location: 650 Shell Blvd, Foster City, CA 94404
Foster City👶 Best for all ages💲 Free🚗 0.6 miPavilion: Lagoon Gazebo · Capacity: Holds up to 50 people · Amenities: gazebo on lagoon, open lawn, basketball court, tennis courts, bike/walking path, par course, boat launch, restrooms on-site, community building nearby
Reserve Leo J. Ryan Park — Gazebo pavilion →
The most scenic Foster City birthday option — lagoon-edge gazebo, 20 acres of lawn, basketball, tennis, and a boat launch kids will love. Leo J. Ryan Park's gazebo sits directly on the lagoon for a waterfront birthday backdrop that most indoor venues charge a premium for. 20.7 acres of park, open lawn for games, basketball, tennis, walking/biking path, and a boat launch. Gazebo capacity 50. Reserve in-person at The Vibe (670 Shell Blvd) or call (650) 286-3374.
Good to know: gazebo on lagoon, 20-acre park, basketball court, bike path, boat launch, community building, par course, tennis courts, restrooms, open lawn.
Parent tip: The lagoon gazebo is the reason to book Leo Ryan over the other parks — the waterfront backdrop is genuinely beautiful for birthday photos. The hilltop picnic area (uncovered tables above the amphitheater) handles overflow if your guest list is larger than 50.
3. Sea Cloud Park (Foster City)
Location: 100 Sea Cloud Dr, Foster City, CA 94404
Foster City👶 Best for all ages💲 Free🚗 1.8 miPavilion: Picnic Area · Amenities: baseball diamonds, soccer fields, batting cages, playground, volleyball, open lawn for games, snack shack, restrooms on-site
Reserve Sea Cloud Park pavilion →
Foster City's largest sports park — 23 acres with batting cages, baseball, soccer, volleyball, and a playground for birthday parties that double as a game day. Sea Cloud Park at 100 Sea Cloud Dr is the biggest park in the Foster City system (23.9 acres) and the right call for birthday parties where kids want to actually play sports, not just run a playground. Baseball diamonds, soccer fields, batting cages, volleyball, a playground, and a snack shack on-site. Restrooms available. Book online through the city's WebTrac portal.
Good to know: picnic area, baseball diamonds, soccer fields, batting cages, playground, volleyball, open lawn, restrooms, snack shack.
Parent tip: Sea Cloud is the pick for older-kid or tween birthday parties where a pickup game of baseball or soccer is part of the entertainment plan. The batting cages are a bonus most parks don't have. For pure picnic-and-playground parties, Boothbay's covered pavilion is the better call.
4. Catamaran Park (Foster City)
Location: 499 Catamaran St, Foster City, CA 94404
Foster City👶 Best for all ages💲 Free🚗 0.9 miPavilion: Picnic / Turf Area · Amenities: large turf area, picnic tables, playground, basketball court, 2 tennis courts, sand volleyball pit, beach area, lagoon views, restrooms on-site
Reserve Catamaran Park pavilion →
The central Foster City option with lagoon views, a beach area, and enough courts to keep every age group occupied. Catamaran Park at 499 Catamaran St has a large turf area for games, sand volleyball, basketball, two tennis courts, a playground, and a beach area on the lagoon. Restrooms on-site. Scenic setting without the in-person booking requirement of Boothbay and Leo Ryan. Book online at registration.fostercity.org.
Good to know: large turf area, picnic area, playground, basketball court, 2 tennis courts, sand volleyball pit, beach area, lagoon views, restrooms.
Parent tip: Catamaran's beach area is a bonus for toddler and early-elementary birthday parties — the sand gives younger kids a play zone that doesn't require any setup. The turf area is large enough for piñatas, sack races, or whatever lawn game your group wants to run.
5. Edgewater Park (Foster City)
Location: 1 Antares Ln, Foster City, CA 94404
Foster City👶 Best for all ages💲 Free🚗 1.2 miPavilion: Picnic Area · Amenities: picnic tables, playground, lighted softball diamond, basketball courts, tennis courts, open lawn for games, restrooms on-site
Reserve Edgewater Park pavilion →
Best Foster City option for a late-afternoon or early-evening birthday party with sports on the agenda. Edgewater's lighted softball diamond keeps organized games running after dark — the one feature no other Foster City park offers. Basketball courts, tennis courts, playground, open lawn, picnic area, and restrooms in 8.5 acres. Online booking at registration.fostercity.org.
Good to know: picnic area, playground, lighted softball diamond, basketball courts, tennis courts, open lawn, restrooms.
Parent tip: The lighted softball field is the reason to pick Edgewater over Catamaran for evening birthday gatherings. If your party runs from 4–8 p.m. in fall or winter when it gets dark earlier, the lights mean the game doesn't end early. Most Foster City parks don't have lit fields.
Frequently asked questions
How do I reserve a picnic area or pavilion at a Foster City park?
Most parks book through Foster City's online WebTrac system at registration.fostercity.org. Boothbay Park's covered pavilion and Leo Ryan Hilltop require an in-person reservation at The Vibe Teen Center, 670 Shell Blvd — call (650) 286-3374 to start. All locations: you get a permit confirmation to bring on party day.
Do I need a permit for a small birthday party?
Groups under 25 without alcohol can typically use unreserved picnic areas first-come. But if you have 25+ guests, are bringing a bouncy house, or plan to serve alcohol, a permit is required. For birthday parties that you've invited a class to, assume you need the permit.
Can I bring an inflatable or bounce house?
Check with Parks when you book — regulations vary by park and are updated periodically. Call (650) 286-3374 or email dlandwehr@fostercity.org before booking a bounce house vendor.
Does the Boothbay pavilion reservation include exclusive access?
Your reservation covers the pavilion rental space and adjacent picnic area. The playground, volleyball, basketball, and tennis courts remain open to the public. In practice, birthday groups fill most of the activity areas naturally, so the open-to-all policy rarely creates conflict.
Heads-up: rental fees, capacity limits, and rules around alcohol, inflatables, and amplified sound change periodically. Always confirm current details directly with Foster City Parks at (650) 286-3374 or dlandwehr@fostercity.org before sending invitations.
How we picked these
Every park here has a reservable outdoor picnic area or covered pavilion through Foster City's parks system. We focused on parks with covered or semi-covered structures, a playground or sports court close enough that parents can supervise from the tables, and restrooms on-site. For parks where online booking is available, we linked to the WebTrac portal; for Boothbay and Leo Ryan Hilltop which require in-person reservation at The Vibe (670 Shell Blvd), we linked to the park rental page. Groups of 25 or more require a permit at most Foster City parks.
Planning your visit
Foster City picnic reservations run through the city's WebTrac portal at registration.fostercity.org. For Boothbay Park pavilion and Leo Ryan Hilltop, reservations must be made in-person at The Vibe Teen Center (670 Shell Blvd, Foster City) — call (650) 286-3374 or email dlandwehr@fostercity.org to arrange. For all parks, groups of 24 or fewer can often use picnic areas first-come; 25+ require a permit. If you're serving alcohol, the reservation must be made at least 30 days before your event. Sea Cloud, Edgewater, and Catamaran parks book through the online WebTrac system. Fees for smaller picnic areas range from $40–$80/site; confirm current rates when booking.
For more kids' events near Foster City this week, see the Foster City events page.
Foster City Parks for Birthday Parties — Frequently Asked Questions
What are the best parks for birthday parties for kids near Foster City, CA?
Our 2026 guide picks 5 standout parks for birthday parties within about 20 miles of Foster City. The top picks include Boothbay Park, Leo J. Ryan Park — Gazebo and Sea Cloud Park — each chosen for kid-friendly layout, parent reviews, and how well it holds up on a weekend visit.
Are parks for birthday parties near Foster City free?
Yes — every parks for birthday partie in this guide is free to visit. You won't need tickets or a reservation for Boothbay Park, Leo J. Ryan Park — Gazebo, Sea Cloud Park or any of the other picks.
What is the closest parks for birthday partie to Foster City?
Leo J. Ryan Park — Gazebo is the closest pick at under a mile from Foster City. It's the easiest one to fit into a weekday afternoon — short drive, low commitment, easy to leave early if the kids melt down.