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Two more brush fires burned around the southern Tri-Valley on Sunday, including the 132-acre Mines Fire near rural Livermore – the second-largest of six wildfires to ignite in the region in just over a week.
Firefighters were able to gain some control over the Mines Fire about two hours after it started under unknown circumstances just after 2 p.m. Sunday (July 26) in the area of Mines and San Antonio Valley roads in Santa Clara County near the Alameda County border, according to Cal Fire.
An aggressive attack, including aircraft fire retardant lines, was deployed to stop forward progress and hold the fire to 132 acres with 10% containment as of late afternoon, according to Cal Fire.
Earlier Sunday, a 5-acre vegetation fire was controlled after lighting in the morning near the Geary Road intersection with Alameda Creek in Sunol, according to Cal Fire. East Bay Regional Park District officials closed the Sunol Regional Wilderness Preserve on Sunday afternoon because of the active fire.
Another day of flames and smoke on Sunday continued a tense stretch for the greater Tri-Valley during the 2026 summer fire season.
The northern part of the Tri-Valley was the first hit with a wildfire during breezy July weather. The Morgan Fire charred 51 acres and caused evacuation warnings in Morgan Territory on the east side of Mount Diablo on July 17.
Four days later, an afternoon brush fire between Sunol and Pleasanton spread rapidly to 1,007 acres and threatened some neighborhoods in southern Pleasanton, including the Ruby Hill gated community, which was under evacuation order.
Crews started to gain control later that night on July 21 of the so-called Little Fire – named because of its origin point in the area of Little Valley and Vallecitos roads, albeit an awkward label given its size. They reached full containment over the weekend, according to Cal Fire.
A 10-acre brush fire followed not far away on Friday afternoon, with the Pleasanton Fire burning in south Pleasanton near the intersection of Interstate 680 and Sunol Boulevard.
Another 10 acres were charred Saturday afternoon between Fremont and Sunol in the Vargas Fire.
