Rimrock Auto Arena at MetraPark, Indoor arena in Billings, United States

Rimrock Auto Arena at MetraPark is a large indoor venue in Billings designed to host a wide range of events including sports competitions, concerts, and exhibitions. The building provides flexible seating arrangements and climate-controlled spaces that can be adapted for different types of gatherings and activities.

The arena opened in 1975 as the METRA, an acronym for Montana Entertainment Trade and Recreation Arena, built at the Midland Empire Fairgrounds later renamed MetraPark. On June 20, 2010, the Father's Day Tornado tore off much of the roof; the 2010–2011 renovation cost about $27 million, and Elton John played the first post-tornado concert on April 10, 2011. Naming rights went to Rimrock Auto Group in 2007 and to First Interstate Bank in 2019.

The venue hosts approximately ten concerts annually, featuring performances by established musicians and serves as the location for the Montana State High School Wrestling Tournament.

The arena sits within the 189-acre MetraPark complex off the Billings bench, with parking areas around the buildings; the 2010–2011 remodel improved access from those lots. Concerts draw up to 12,000 people, so arriving early helps on event nights. The Yellowstone County facility is used for hockey, indoor football, basketball, rodeos and fairs, so check which building hosts your event.

The arena hosted the first-ever game of the Oklahoma City Thunder on October 8, 2008, a preseason meeting with the Minnesota Timberwolves that the Timberwolves won 88–82. It has also been an annual stop on the Professional Bull Riders circuit every year since 1996.