By 5 p.m. the flames were basically out and the fire was 100 percent contained, but not before around 30 acres had been scorched. The burned area is off Bollinger Canyon Road in Las Trampas Regional Park between Danville and Moraga.
Firefighters were assisted by cool temperatures.
The fire started just after 2 p.m. in the "Open Space Area." An East Bay Parks regional helicopter scooped water from the upper San Leandro Reservoir to drop on the flames. A Cal Fire plane also dropped fire retardant on the blaze when it was at its height.
The area is mostly in Alameda County, but fire crews from San Ramon Valley, Moraga Orinda and as far away as Marin County joined in the effort.
The fire area was mostly dry, grassy hillsides.
"Most of it is what we call the 'flashy fuels.' It's the tall weeds that people see around. And, so that type of fuel actually burns really, really hot and fast," explained Kim French with the San Ramon Fire Department. "Any wildfire is tricky because we don't have paved roads up to some of these areas. But, we do have what we call type-3 engines that are off-road engines that are just for this type of even, to try to get to where the fire is and get it contained.
There were no structures threatened during the fire and no evacuations. Firefighters did have to check on some children at a daycare at the Little Hills Ranch along with some residents at a local senior center, mostly because of the bad air quality.
Investigators do not yet know the cause of the fire. The area is often used by hikers and joggers. A jogger in fact, called in the fire.
Considering the wind conditions, firefighters were feeling lucky that the fire only spread to 30 acres.