Grass fire injures five, forces evacuations and Interstate 25 closure in Thornton, Colorado
A grass fire ignited near 84th Avenue and Huron Street in Thornton, Colorado, at 11:30 LT on February 25, 2026, injuring five people, prompting the evacuation of Pinnacle Charter High School and nearby neighborhoods, and forcing a temporary closure of Interstate 25. The fire burned approximately 4 ha (10 acres) before it was contained at around 14:30 LT.
Grass fire in Thornton, Colorado on February 25, 2026. Credit: Thornton Police Department
The fire developed under a Red Flag Warning issued by the National Weather Service for the Denver metropolitan area and surrounding regions below 1 830 m (6 000 feet).
Forecast conditions included sustained winds of 40–55 km/h (25–35 mph) with gusts up to 90 km/h (55 mph), relative humidity near 10%, and temperatures ranging from 16–21°C (60–70°F). The combination of strong winds, low humidity, and dormant winter grasses allowed the fire to spread rapidly across open vegetation.
The fire moved between a residential neighborhood to the north and commercial properties to the south. Approximately 150 personnel responded to the incident, including crews from the Thornton Fire Department, Adams County Fire Rescue, the Westminster Fire Department, and the Westminster Police Department.
Four firefighters and one civilian sustained non-critical injuries during suppression operations.
Pinnacle Charter High School, located at 8412 Huron Street, and nearby businesses were evacuated as a precaution due to the proximity of the advancing flames.
Dense smoke from the fire led to the full closure of Interstate 25 in both directions between Thornton Parkway and 84th Avenue for about 90 minutes.
No residential structures were damaged or destroyed, but several businesses and multiple vehicles in a commercial yard sustained damage.
Authorities said the scale and speed of the response were intended to prevent wildland-urban interface losses similar to those during the December 2021 Marshall Fire in Boulder County, which destroyed more than 1 000 homes.
The cause of the fire remains under investigation.
I’m a science journalist and researcher at The Watchers, contributing to the Epicenter edition, where I cover peer-reviewed scientific research and emerging discoveries across Earth and space sciences. With a background in astronomy and a passion for environmental science, I’ve worked in shark and coral conservation in Fiji, conducting reef and shark-behavior research, contributing to mangrove restoration, and earning PADI Open Water and Coral Reef Certifications. I bring a blend of scientific rigor and storytelling to illuminate the discoveries shaping our planet and beyond.
Commenting rules and guidelines
We value the thoughts and opinions of our readers and welcome healthy discussions on our website. In order to maintain a respectful and positive community, we ask that all commenters follow these rules.