Tick Season in Northern California

David Herfindahl MD, MPH                               Marcie Jo Cudziol RN, PHN, MPA

Health Officer                                                      PHN Director 

Questing tick



Date:          June 11, 2019
Contact:    Marcie J. Cudziol, 530-623-8209

Tick Season in Northern California

TRINITY COUNTY - Trinity County Public Health would like to remind residents that we are in the midst of active tick season in Northern California. The months of May, June, and July are typically when we see the highest risk for contracting Lyme disease from a tick bite, with nymphs seeking a blood meal to fuel their growth into adult ticks.
Ticks are small arachnids most often found in naturally vegetated areas. There are many different kinds of ticks in California, but only the western black-legged tick (Ixodes pacificus) transmits Lyme disease. This reddish-brown tick is found in most California counties, but is more common in the humid Coast Range, Klamath Mountains, and the western slope of the northern Sierra Nevada. 

Ticks can be found in tall grass and brush in urban, suburban and rural settings. Adult ticks climb to the tips of vegetation, often alongside trails or paths, and wait for a host to brush against them. They attach to animals and humans and feed on blood by inserting their mouth parts (not their whole bodies) into the skin.

A person may become infected with the bacteria that causes Lyme disease when bitten by an infected western black-legged tick. As the number of tick borne diseases continues to increase, the first line of defense for all these diseases is taking precautions to avoid tick bites.


•    Avoid areas where ticks live if possible.
•    Wear light colors so ticks can be easily seen if they get on your clothing.
•    Wear long pants and long – sleeved shirts. Tuck your pants into your boots or socks, and tuck your shirt into your pants.
•    Use repellant registered for use against ticks which contains at least 20% DEET. Always read and follow the label directions when applying repellents.
•    Thoroughly check yourself and your children frequently for ticks, especially at the hairline, base of the scalp, under the arms, in and around ears, inside the belly button, behind the knees, between the legs and around the waist.
•    Routinely check your pets for ticks and remove them promptly. Check with your veterinarian for appropriate tick control products.
•    If you have been in a known tick area, it is important to perform body checks for up to 3 days after leaving the area due to the possibility of a small nymph that has matured. 


The University of Wisconsin has a free mobile app, The Tick App, to assist with tick identification, which is available through your app store. Additional resources can be found on the California Department of Public Health website. Tick testing is available for a fee from the Shasta County Public Health Laboratory or the Sonoma County Public Health Laboratory.
For questions related to Lyme disease contact Trinity County Public Health at 530-623-8209 or toll free 800-766-6147.