Massive Warehouse Fire Engulfs Medline Distribution Center in Tracy, California, Spreading Thick Smoke Over Miles.

A massive fire engulfed the Medline Distribution Center in Tracy, California, on Thursday, resulting in a total loss of the million-square-foot facility. Local authorities confirmed that all personnel were safely evacuated with no injuries reported, though the blaze spread to a neighboring FedEx facility before crews brought it under control. The cause of the fire remains under investigation as emergency responders continue to monitor the site.

How the Fire Impacted Local Operations

The blaze broke out shortly before 1 p.m. on the roof of the Medline facility, located near Interstate 205. According to Tracy Police Department spokesperson Kaylin Heefner, officers from the San Joaquin County Sheriff’s Office and the California Highway Patrol assisted in the immediate evacuation of the warehouse.

Tracy Fire Chief Randall Bradley reported that firefighters faced significant challenges, including high winds, extreme heat, and a limited water supply. The fire intensified as it moved from the roof into the interior, eventually spreading to an adjacent FedEx building. While crews successfully suppressed the fire at the FedEx site, officials from the San Joaquin County Fire Authority classified the primary Medline warehouse as a total loss.

Air Quality and Public Health Precautions

Despite the large plume of black smoke visible from parts of the Bay Area, local air quality remained within acceptable limits by Thursday evening. Jaime Holt, a spokesperson for the San Joaquin Valley Air Pollution Control District, noted that while the smoke was widespread, the district’s monitors did not trigger emergency air quality alerts.

However, the district issued precautionary guidance for vulnerable populations. Residents with heart or lung conditions, as well as children and older adults, were advised to:

• Stay indoors with windows and doors closed.
• Use air purifiers or HVAC systems with high-efficiency filters.
• Wear N95 masks if outdoor exposure is unavoidable.

What Happens During the Investigation

Authorities have not yet identified the cause of the fire. According to Kaylin Heefner, investigators cannot safely access the site until the structure is completely extinguished and deemed stable.

Medline released a statement confirming that all on-site employees were accounted for and safe. The company is currently working with local responders to assess the impact of the fire on its operations and supply chain. As of Thursday night, there was no estimated timeline for when the investigation into the origin of the blaze would conclude.

Key Facts at a Glance