Depends on the place and year.

Most years, I've had no issues with ticks. But after a rainy winter (like 2010/2011, or 2018/2019), I've been hiking with people who have gotten ticks in the Santa Monicas and even in the San Gabriels.

Spring of 2011 was the worst. After a hike at the Circle-X Ranch, one of my companions had two ticks, and two of us had one apiece.