The fire was initially estimated at about three acres and grew to about seven acres, but firefighters appeared to be getting a good handle on the blaze.
It was first reported around 2:30 p.m., burning into the park and running uphill where it approached a ridge overlooking the 110 Freeway near Highland Park. Water-dropping helicopters were able to stop the forward progress.
By 4:44 p.m. firefighters reported there was little active flame remaining but they stayed on scene for mop-up duty.
Winds were mostly calm.
No structures were damages and no firefighters were injured. Residents of neighboring communities as far as Pasadena were reporting smoke and ash dropping onto their homes.