Bay Area/ North SF Bay Area/ Crime & Emergencies

New Spring Fire Erupts on Sonoma County Private Land, Cause Still Unknown

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Published on September 13, 2026
New Spring Fire Erupts on Sonoma County Private Land, Cause Still Unknown635 CA-20 — Upper Lake Street Scene
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A newly detected wildfire dubbed the Spring Fire is burning on private land in Sonoma County, with its cause and containment status still unknown as of Saturday evening. The blaze was discovered around 4:17 p.m. local time on Saturday.

The fire was first reported by the National Interagency Fire Center, according to the Sacramento Bee, which published its initial breaking report Saturday evening and updated it later that night. Details remain sparse: the outlet's report lists the fire's cause as undetermined and its containment status as unknown, with no word yet on evacuation orders or structural damage.

A Region Already Stretched by Fire Activity

The Spring Fire ignited the same day CAL FIRE's Sonoma-Lake-Napa Unit was already managing the Lucas Fire, a blaze in neighboring Lake and Mendocino counties that had grown to 4,008 acres under a Red Flag Warning, according to SFGATE. That same unit, known as LNU, provides wildland fire protection across six Northern California counties — Sonoma, Lake, Napa, Solano, Yolo, and Colusa — from 21 fire stations, per footage reviewed on YouTube.

Just days before the Spring Fire broke out, LNU crews had also been battling the Steele Fire near Steele Canyon Road in Napa County, a roughly 70-acre blaze that reached 50% containment by September 10, as CAL FIRE reported. Hoodline covered that fire in a Napa evacuation warning report. Nationally, the National Interagency Fire Center reported elevated regional fire danger and active uncontained large fires nearby.

Why a Small Ignition Draws Big Attention Here

Sonoma County's wariness around new fire reports is rooted in a painful history. The wind-driven Tubbs Fire tore through Napa and Sonoma counties in October 2017, burning 36,807 acres, destroying 5,636 structures, and killing 22 people, according to CAL FIRE. Two years later, the Kincade Fire burned 77,758 acres in Sonoma County alone, destroyed 374 structures, and prompted evacuations that forced nearly 200,000 residents to flee.

The scars run deeper still. Between August and October 2020, the LNU Lightning Complex scorched 363,220 acres across Sonoma, Napa, Lake, Solano, and Yolo counties, destroying 1,491 structures and ranking as the seventh-largest wildfire complex in state history, per CAL FIRE records. Shaded fuel breaks and cleared vegetation on public lands can help slow future fire progression.

Rules for Property Owners, and How Residents Get Warned

Defensible space around structures is intended to prevent home ignitions and give firefighters a safe tactical buffer.

If the Spring Fire escalates, residents could look for emergency updates through local notification channels. No containment percentage, acreage, or evacuation order had been released for the Spring Fire as of the latest update, and Hoodline will continue following the story as new details emerge.