The Cottonwood Fire southwest of Benson has grown to about 1,700 acres on Friday, officials said.
The blaze in the Whetsone Mountains started June 25 by lightning.
Crews have the fire about 40 percent contained and the fire’s behavior Friday morning was low, with little smoke visible, according to Coronado National Forest officials.
Crews are building containment lines.
More than 200 people are assigned to the fire. Two single-engine air tankers and three helicopters are working the fire.
Elsewhere, the Grapevine Fire, southwest of Safford, has burned about 4,800 acres. The lightning sparked fire started Thursday south of Arizona 266.
The fire is about 10 percent contained.
Crews did burnout operations near Arizona 266 and south on Forest Road 665 to keep the fire from crossng Arizona 266.