What Is The Biggest Wildfire In Arizona History?

What Is The Biggest Wildfire In Arizona History? Lone Fire | When: 1996. Where: Four Peaks Wilderness. Acres burned: 61,370. The Lone Fire was the largest-known fire in Arizona history when it tore through the Mazatzal Mountains, Four Peaks Wilderness area and portions of the Tonto National Forest. What are the five biggest forest fires