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Somerville Indoor Playground Birthday Parties

3 indoor playgrounds in Somerville, Massachusetts host birthday parties — 2 with party bookings confirmed on the venue's own site. They're ranked below by local reputation (rating weighted by review count). Weekend slots go first everywhere, so start calling 3–4 weeks out.

1. LEGO® Discovery Center Boston

4 ★★★★☆ 3,536 reviews

598 Assembly Row, Somerville, MA

Hosts birthday parties Toddler-friendly

Open-play admission runs around $27 — party packages are quoted separately, so ask when you book.

“We visited last week for our sons’ birthdays. It was easy to walk to from the MBTA and there were lots of other great stores nearby. When we walked in, it was bright and exciting.…” — Jackey

2. Bouldering Project - Somerville

4.4 ★★★★☆ 822 reviews

12A Tyler St, Somerville, MA

Hosts birthday parties

Check party packages →

3. Play Union

4.7 ★★★★★ 78 reviews

378 Somerville Ave, Somerville, MA

Hosts birthday parties Toddler-friendly Sensory-friendly

Open-play admission runs around $5 — party packages are quoted separately, so ask when you book.

“We had my 4 year old's birthday at Play Union this weekend and it was such a fun, stress-free experience. Debbie goes above and beyond and is so easy-going amidst the kid-created…” — Stephanie

Party bookings confirmed on their website.

Booking a party in Somerville: the short checklist

  1. Book 3–4 weeks ahead — Saturday afternoons fill first. A Sunday-morning or weekday slot is easier to land and sometimes cheaper.
  2. Ask: exclusive use or shared floor? Some packages close the playground for your group; most give you a private party room while open play continues around you. Both work — just know which you're getting.
  3. Put grip socks on the invitation. Most venues require them for every child on the equipment, party guests included. Ask if they're included in the package or sold at the door.
  4. Sort the deposit and waivers early. Expect a deposit to hold the slot — check the refund and reschedule policy. If the venue has an online waiver, send the link with the invites so check-in isn't a paperwork line.
  5. Confirm the cake rules. Most venues let you bring your own cake; some charge for other outside food. Pizza add-ons are the standard route.

Party venues near Somerville

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