Roughly 2,500 firefighters, including many from several western states and as far away as New York, are working to contain the wildfires, fire information officer Peter Frenzen said.
ABC 15 reports that some of the out-of-town blaze battlers are full-time firefighters, mostly from the Pacific Northwest. But some are seasonal workers or students.
The blaze nearly doubled in size between Sunday and Monday, with nearly 400 square miles up in smoke. Thousands have been evacuated.