Carlos Montes, 30, disappeared from the Male Community Reentry Program in Los Angeles.
Montes was serving a five-year sentence for second-degree robbery and evading or attempting to evade a peace officer while driving recklessly.
It was not immediately clear how much time was left on his sentence, but the MCRP is a voluntary program designed to provide a transition for inmates who have between 60 days and two years left to serve. The program provides them with services to help their reentry into society, including substance-abuse and mental health support.
Officials with the California Department of Corrections and Rehabilitation say an alarm was triggered from Montes' monitoring device around 4:30 p.m. Saturday and they could not locate him in the facility.
Montes is five feet eight inches tall and weighs 164 pounds. He was last seen wearing a burgundy shirt and jean shorts.
Anyone who sees him should call 911.