New England’s
BEST
Bouldering
gym

Geometric lion head illustration

We’re digging deep into the heart of authentic
New England climbing

Black and white image of a person rock climbing on an indoor wall with large round holds.
Black and white photo of a person bouldering on an indoor climbing wall, reaching with one hand and wearing climbing shoes.
Climbers in an indoor bouldering gym with climbing holds and walls. Four people are gathered in conversation, with climbing gear and chalk bags visible.

Sign a waiver today

Black and white photo of people at an indoor climbing gym, featuring a person climbing a bouldering wall with various holds. Others are seated or standing, observing.
Indoor rock climbing gym with people watching climbers on a bouldering wall, featuring overhanging holds and a clock on the wall.
Person setting holds on indoor climbing wall using ladder in gym environment.
Historical bank building with columns in black and white, featuring a clock labeled "Union Square."

Preserving the soul of local climbing

Black and white photo of three large, ornate arched windows with decorative moldings and Corinthian columns.

  • Boulder Union is the perfect place for beginners. We offer a Bouldering Basics class and friendly staff will help you get started, ensuring you have a fun and safe experience on the walls. No prior experience required!

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  • Yes! Boulder Union offers group rates for birthday parties, corporate events, and other special gatherings. Contact us for more information and to book your group session.

  • Yes! Most kids love to climb and it’s a great way for them to expend energy. We do have a kids policy in place to ensure everyone’s safety and to provide a great experience for all.