Dylan Stanley Dougherty and Ryan Dougherty are both scheduled to appear before a judge Monday in Walsenburg.
The brothers along with their sister each face five counts each of attempted second-degree murder, first-degree assault, and other felony charges related to a high speed chase and what authorities say was a shootout during their capture in August.
Lee Grace Dougherty pleaded not guilty last month.
The siblings are accused of robbing a bank in Georgia and shooting at police officers in Florida and Colorado. They were also suspected of two car thefts in Utah.