The Milli Fire was a wildfire that burned over 24,000 acres (97 km2) of Oregon forest land during the summer of 2017. The fire began in the Deschutes National Forest on 11 August 2017, the result of a lightning strike. The fire consumed thick forest vegetation southwest of Sisters, Oregon. Most of the burned area was public lands administered by the United States Forest Service, much of it in the Three Sisters Wilderness. Firefighters battled the blaze for over a month. At the peak of the firefighting effort, there were 675 firefighters working on the Milli Fire.