Firearm violence is a critical public health issue in the United States. Extreme Risk Protection Order (ERPO) laws are an intervention method that have been enacted in many states to prevent firearm violence including mass violence threats. Oregon’s ERPO law allows family/household members or law enforcement officers (LEOs) to petition a civil court for an order to temporarily restrict a person’s access to firearms when at imminent risk of harming themselves or others. This study examined the characteristics of ERPO petitions filed in Oregon for a 6-year period that involved mass violence threats.