Lumin

Fire Start, Size and Growth

Start Date/Time/Location: The Lumin Fire ignited around 1:10 p.m. MDT on Friday, July 31, 2026, north of Clearmont in Sheridan County, Wyoming, near the junction of SR-Buffalo and Passaic Roads.
Size and Containment: As of August 2, 2026, the fire has burned approximately 7,221 acres and is 5% contained.
Fuels, Growth and Rate of Spread: Primarily fueled by dry grass and brush, the fire grew rapidly due to hot and dry weather conditions, expanding from 20 acres to over 7,200 acres within its first day. The terrain and dry fuels have made the fire difficult to contain.
Containment Efforts: A Wyoming Type 3 Incident Management Team assumed command of the fire on August 1. Local resources from the Clearmont Fire District, all Sheridan County Fire Districts, Sheridan County Road & Bridge, Campbell County Fire, Wyoming State Forestry Helitack, and fixed-wing aviation are actively engaged in suppression. Firelines have been constructed around the perimeter, though the terrain remains a challenge.

Emergency Information

Evacuations and Sheltering:
Mandatory Evacuation Orders: Currently, there are no mandatory evacuation orders in place for the Lumin Fire.
Evacuation Warnings: There are no evacuation warnings active at this time.
Curfew: No curfews have been issued.
Evacuation Shelters and Information: No evacuation shelters have been opened, as an estimated 0 people are currently impacted by evacuation orders. Residents should remain vigilant and monitor official channels for any changes.

Road and Infrastructure Closures:

• SR-Buffalo Road and Passaic Road are experiencing increased traffic from fire personnel and heavy equipment.
• Authorities are requesting that only necessary travel takes place in the area to allow firefighters and emergency vehicles room to work safely.
• No school or critical infrastructure closures have been reported.
• Aviation Warning: Authorities have strictly warned the public against flying drones in the area. Drone incursions force aerial firefighting operations to halt immediately, directly allowing the fire to grow and putting crews at risk.

For more information, visit:

• Sheridan County Emergency Management
• Wyoming State Forestry Division Fire Management
• Watch Duty Wildfire Map

Current Impact

Impacts:
Injuries and Fatalities: There have been no injuries or fatalities reported in connection with the Lumin Fire.
Structures Impacted: While the rapid spread of the fire initially threatened structures in the area, official reports confirm that 0 structures have been lost or damaged so far.
School and Business Closures: There are no school or business closures reported due to this fire.
Notable Impacts: The fire has burned across approximately 7,200 acres of private and state lands, making it the largest active wildfire in Wyoming at this time.

Safety Concerns:
Power Outages: No power outages have been reported as a result of the Lumin Fire.
Water Safety: There are no specific water safety or boil water advisories in effect.
Burn Bans: Residents should adhere to all local fire restrictions and check with Sheridan County authorities for any active burn bans in the region.
Air Quality: Smoke from the fire may pose health risks, particularly for sensitive groups or those with respiratory conditions. Residents in affected areas are advised to stay indoors if smoke becomes heavy.

Ongoing Outlook

Containment Projections: Firefighters face significant weather challenges in the coming days. While firelines have been constructed, the difficult terrain and abundance of dry fuels make containment efforts challenging. The Incident Management Team remains focused on public and firefighter safety while working to increase the current 5% containment.
Weather and Wind Warnings: Hot and dry conditions are expected to persist in northern Wyoming, with temperatures forecast to reach the upper 90s. These conditions present a continuous challenge to suppression efforts and increase the risk of further fire spread.

Cause and the Role of Weather and Climate

Cause: The Lumin Fire was caused by a lightning storm that moved across the region on July 31, 2026.
Weather and Climate: Extreme weather and fuel conditions played a critical role in the fire's rapid initial growth. The region has been experiencing hot, dry conditions with temperatures nearing 100 degrees. These high temperatures significantly dried out the grass and brush, creating highly receptive fuels that allowed the lightning strike to quickly develop into a large-scale wildfire.

For more information, visit:

• Sheridan County Emergency Management
• Wyoming State Forestry Division
• National Interagency Fire Center (NIFC)