Deer Head Fire, viewed Sunday from the Mescal area, has grown to 320 acres.

National Park Service / Perry Grissom

The wildfire burning in the Rincon Mountains east of Tucson has grown to about 320 acres and will likely continue to grow as drier weather moves into the area.

The lightning sparked fire in a rugged area of Saguaro National Park East was first spotted on Thursday. Park officials are managing the fire to benefit the environment and to burn off fuel sources. The fire is burning off pine needles, leaves, grass, downed logs and shrubs. Most large trees in the burn zone are expected to survive, according to a news release Monday from the National Park Service.

Fire crews have been assigned to the Deer Head Fire to create fire lines to manage the blaze. They are also prepared to protect important sites, such as the Manning Camp, if the fire moves in that direction.

Park officials said with drier weather moving into the area, the wildfire is expect to grow until the area receives significant rain. The fire's behavior has been mild during the past two days.

There are campground and back-country trail closures in the park associated with this fire. For a list of closures go to the park's Facebook page.