Arts & Crafts Vendors

Sidewalk Sales

Live Bands

Street Dances


Steak Fry in the City Park

 -Friday night, by Pickles Place

$5 Breakfast in the City Park

 -After fun run, all you can eat

Food Vendors

Inflatable toys for kids

Atomic Days Events:

Softball Tournament

Sand Volleyball Tournament

Horseshoe Tournament

Brad Remer Memorial Rodeo

Car Show

On July 17, 1955, Arco became the first city in the world to be lit by nuclear energy! Electricity, generated by the Boiling Water Reactor III (EBR I) at the internationally renowned Department of Energy Idaho National Laboratory, was switched by local technicians to light the City of Arco for approximately 2 hours on that historic day. Arco’s Atomic Days, sponsored by the Butte County Chamber of Commerce, is held annually on the 3rd weekend of July. It is a community-wide celebration of this historic day in Arco’s history.  Come run with us and enjoy a weekend of celebration, activities, and history that Atomic Days has to offer. See the list of activities below:

To view accommodations

available in Arco,


About Atomic Days

Photos by The Bear and The Echo Photography/Boone Barnes