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Heads up, drivers: Vegetation fire on Hwy. 101 backs up traffic in SLO County

Cal Fire works to extinguish a blaze on Highway 101 near Santa Margarita on Wednesday, Sept. 17, 2025.
Cal Fire works to extinguish a blaze on Highway 101 near Santa Margarita on Wednesday, Sept. 17, 2025.

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Update, 3:50 p.m.:

According to the CHP traffic page, the No. 1 southbound lane was reopened to traffic while the No. 2 lane remained blocked off for fire personnel as of 3:39 p.m.

As of 3:50 p.m., southbound traffic was still crawling as far north as Atascadero, according to the CHP page.

A fire ignited along Highway 101 near Santa Margarita on Sept. 17, 2025.
A fire ignited along Highway 101 near Santa Margarita on Sept. 17, 2025. ALERTCalifornia | UC San Diego

Original story:

A vegetation fire reported in northern San Luis Obispo County along Highway 101 bottled up traffic on Wednesday afternoon.

According to the California Highway Patrol’s Traffic Incident Information Page, at around 2:55 p.m., a vegetation fire was reported on the roadside near Highway 58.

By 3 p.m., traffic was reportedly stopped heading southbound on Highway 101, with the delay stretching farther north.

Cal Fire was en route as of 3:03 p.m., and was coordinating with CHP to help with traffic as of 3:10 p.m., according to emergency scanner traffic.

Cal Fire works to extinguish a blaze on Highway 101 near Santa Margarita on Wednesday, Sept. 17, 2025.
Cal Fire works to extinguish a blaze on Highway 101 near Santa Margarita on Wednesday, Sept. 17, 2025. Courtesy of Cal Fire

According to the scanner traffic, the fire reached two acres at 3:14 p.m., growing at a moderate rate of spread, with potential to burn five acres.

One structure in the area was threatened by the fire as it spread across lanes, according to the scanner.

Air attack units joined fire engines and tankers at around 3:14 p.m.

Current Southern California wildfires

This map shows wildfires that have been updated within the past 7 days from the Integrated Reporting of Wildland-Fire Information (IRWIN) and the National Interagency Fire Center (NIFC). The larger the circle, the larger the wildfire by acres. Data is from the US Department of the Interior, Office of Wildland Fire, IRWIN, NIFC, NASA, NOAA and ESRI.


This story was originally published September 17, 2025 at 3:24 PM.

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Joan Lynch
The Tribune
Joan Lynch is a housing reporter at the San Luis Obispo Tribune. Originally from Kenosha, Wisconsin, Joan studied journalism and telecommunications at Ball State University, graduating in 2022.
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