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, following a lightning storm north of Clearmont in Sheridan County, Wyoming, near the junction of SR-Buffalo and Passaic Roads.
Size and Containment: As of August 3, 2026, the fire has burned approximately 7,221 acres and is currently 5% contained.
Fuels, Growth and Rate of Spread: The fire experienced explosive growth within its first 24 hours, expanding from an initial 20 acres to over 7,200 acres. This rapid rate of spread was driven by highly receptive dry fuels and challenging terrain.
Containment Efforts: A Wyoming Type 3 Incident Management Team, led by Commander Jon Warder, assumed command of the incident on August 1. Suppression efforts are being conducted by a robust coalition of local and state resources, including the Clearmont Fire District, all Sheridan County Fire Districts, Campbell County Fire, Sheridan County Road & Bridge, heavy equipment contractors, Wyoming State Forestry Helitack, and fixed-wing aviation. Firelines have been constructed around the perimeter, though rough terrain continues to challenge crews.

Emergency Information

Evacuations and Sheltering:
Mandatory Evacuation Orders: There are currently no mandatory evacuation orders in place for the Lumin Fire.
Evacuation Warnings: No evacuation warnings have been issued at this time.
Curfew: No curfews are currently active for the area.
Evacuation Shelters and Information: Because there are no active evacuations, no shelters have been opened, and an estimated zero people are currently displaced.

Road and Infrastructure Closures:

• Road Advisories: While there are no hard road closures, SR-Buffalo Road and Passaic Road are experiencing heavy traffic from fire personnel and heavy equipment. Authorities strongly request that the public limit travel in this area to essential trips only to allow firefighters room to work safely.
• School and Infrastructure: No schools or critical infrastructure are reported closed.
• Aviation Warning: Officials have issued a strict warning against flying drones near the fire area. Unauthorized drones force firefighting aircraft to ground, severely hindering suppression efforts and putting communities at greater risk.

For more information, visit:

• Sheridan County Emergency Management
• Wyoming State Forestry Division Wildfire Info
• Watch Duty - Lumin Fire Updates

Current Impact

Impacts:
Injuries and Fatalities: There have been no reported injuries or fatalities among civilians or fire personnel.
Structures Impacted: The rapid initial spread of the fire threatened nearby structures, but official reports confirm that zero structures have been damaged or destroyed so far.
School and Business Closures: No school or business closures have been reported in connection with this incident.
Notable Impacts: The fire has scorched over 7,200 acres of private and state lands, disrupting local traffic and requiring significant state and local firefighting resources.

Safety Concerns:
Power Outages: No power outages have been reported in connection with the fire.
Water Safety: No water safety advisories or boil water notices are in effect.
Burn Bans: Residents should observe all local Sheridan County fire restrictions and burn bans given the extreme fire danger in the region.
Air Quality: Smoke from the fire may impact local air quality. Residents, especially sensitive groups or those with respiratory conditions, should monitor conditions and stay indoors if smoke becomes heavy.

Ongoing Outlook

Containment Projections: The fire currently sits at 5% containment. While crews have successfully constructed firelines around the fire, they face significant ongoing challenges due to the rugged terrain and uncooperative weather. Firefighters are working to reinforce these lines and increase containment over the coming days, prioritizing public and personnel safety.
Weather and Wind Warnings: Fire personnel are facing significant weather challenges, with temperatures forecasted to reach the upper 90s. The combination of intense heat and dry conditions will continue to test containment lines and pose a risk for increased fire behavior.

Cause and the Role of Weather and Climate

Cause: The Lumin Fire was sparked by a lightning storm that moved across the region on July 31, 2026, igniting multiple fires in the area.
Weather and Climate: Extreme weather and fuel conditions were the primary drivers of the fire's rapid initial growth. Northern Wyoming has been experiencing a period of intense heat, with temperatures nearing 100 degrees, which has critically dried out the local vegetation. These parched fuels, combined with the lightning event, created the perfect conditions for a major wildfire to take hold.

For more information, visit:

• Sheridan County Emergency Management
• Wyoming State Forestry Division Wildfire Info
• Watch Duty - Lumin Fire Updates