Sugarpine Butte is an Iron Butte spot where a historical marker tells the story of a giant iron meteorite found nearby. It is a collectible stop, worth a detour if you are hunting markers.
The marker counts toward Iron Butte's 6 historical markers. There is no mission here.
Black Mountain Ridge
Black Mountain Ridge is a spot in the Iron Butte valley with a historical marker about Iron Butte itself, an old volcano. Stop by if you are filling out the historical marker collection.
Cloverdale Research Iron Butte Facility
The Cloverdale Research Iron Butte Facility is a high-security private lab in Iron Butte, still powered two years after the outbreak. You only go here with Sarah for the story, so there is no open-world job to clear.
Iron Butte NERO Research Site 1
The only NERO research site in Iron Butte, beside a helicopter wreck across a gap from the southern Iron Butte ambush camp. A Nitrous bike jump gets you across. It only opens once Iron Butte does, after the Rippers fall.
Iron Butte Ranch Horde
A 300-Swarmer Horde at Iron Butte Ranch that you clear in Keep Them Safe, part of the push toward Wizard Island. It is the only Horde you ever fight in Iron Butte, and it shows up just for this mission.