Cumero Fire

On July 5, 2018, smoke was spotted rising from Mount Cumero, near Sasabe, Arizona, near the Mexico–United States border and within the Coronado National Forest. By 6:00 PM (Mountain Time), three fire crews supported by five helicopters were on scene attempting suppression of the Cumero Fire.^[1] By the next day, the fire had grown to 3,825 acres (1,548 ha)—within the United States and Mexico—but firefighters made progress in suppressing the fire, estimating its spread to be 40% contained.^[2][3] On July 7, the fire expanded into the Buenos Aires National Wildlife Refuge and to a size of 3,825 acres (1,548 ha),^[4][5] then to 3,925 acres (1,588 ha) on July 8, but was by then 80% contained.^[6] The fire continued to burn in containment until July 10.^[7]

The Cumero Fire burned 4,000 acres (1,600 ha) over five days in the United States and Mexico and cost $500,000 (equivalent to $626,093 in 2024) to suppress. No structures were destroyed or damaged.^[7]

No cause for the fire was determined.^[7]