Atomic Underground Lounge Great Falls

10/14/2026

We’re hosting a private event for @ MSU Billings Alumni Foundation! Closed until 7pm for this event. See you at 7.

10/14/2026

HEADS UP GREAT FALLS! We will be closed on Halloween. Have a fun and safe Halloween night.

10/13/2026

Atomic Underground Lounge open Wednesday through Saturdays in O'Haire Inn at 4pm.

10/04/2026

Imagine a holiday gathering that shatters the status quo! 🎉 Ditch the tired traditions and create an unforgettable retro-themed celebration that will leave a lasting impression. Our carefully crafted vintage-inspired appetizer menu is the perfect catalyst for a truly memorable event. Book the Atomic for your private gathering at $100/hr plus food and beverage, and get ready to make it a story to tell for years to come! Contact Donnie at 406-590-1860 or email Sandi at [email protected] to reserve your spot today and unlock the potential for an extraordinary celebration. For groups up to 48ppl.

10/01/2026

Open tonight at 4pm!

09/30/2026

09/30/2026

Imagine a holiday gathering that shatters the status quo! 🎉 Ditch the tired ugly sweater traditions and create an unforgettable retro-themed celebration that will leave a lasting impression. Our carefully crafted vintage-inspired appetizer menu is the perfect catalyst for a truly memorable event. Book the Atomic for your private gathering at $100/hr plus food and beverage, and get ready to make it a story to tell for years to come! Contact Donnie at 406-590-1860 or email Sandi at [email protected] to reserve your spot today and unlock the potential for an extraordinary celebration. For groups up to 48ppl.

09/20/2026

BE THE COOL KID THAT BOOKS THE ATOMIC UNDERGROUND LOUNGE FOR YOUR COMPANY HOLIDAY GET-TOGETHER! We've got some dates left open for private events in the Atomic. Up to 48ppl. For more information text Donnie at 406-590-1860 or email Sandi at [email protected].

09/18/2026

The Atomic will open at 7pm tonight, Friday September 18.