The Rocky Canyon Fire was mapped at 15,366 acres with 25% containment according to an update from Utah Fire Info on August 12, 2026. Firefighters reported making progress along lower elevations across the perimeter through the use of crews, heavy equipment, and aviation support.
Night operations showed normal fire behavior until approximately 3:00 a.m., when the fire mostly cooled and calmed. While the fire was calmer than previous nights, multiple hotspots remained active in higher elevations within timber stringers and the interior heat.
On the southeast corner, crews used moisture and cooler weather to secure the line. Minimal growth occurred on this perimeter, except for one small spot across Franklin Canyon that was caught. Firefighters continued to mop up and secure that edge.
The threat to the Coalville area and the I-84/I-80 junction was described as minimal. Containment along that perimeter could increase if crews maintained their success.
In the northeast corner near Henefer, the fire pushed into rocky areas. Despite cooler temperatures, the fire made large runs onto the ridges. Crews were assigned to higher ground to prevent the fire from progressing up the northwest perimeter.
The south side along SR-66 and SR-65 appeared mostly cool along the edge, though pockets of interior heat remained. Increased humidity and potential wetting rain provided opportunities for firefighters to make progress through patrolling and mopping up areas where needed.
