The Hat Rock Fire, east of Hermiston, has grown to 10,000 acres and it's moving into Washington state.
The Oregon State Fire Marshal sent six task forces and an incident management team. Washington state is also sending firefighters.
The wind-driven fire quickly grew Tuesday afternoon. It's burning grass and brush, but also threatening homes, power lines and crops.
Level 1 evacuation warnings are in place.
The investigation into the cause of the fire is ongoing.