Ticks live throughout California, from coastal forests and chaparral to Sierra foothills, inland woodlands, parks, and backyards. The state has many tick species, although only some commonly bite people or transmit disease.
You may encounter ticks during hikes, gardening, camping, and time spent with pets.
You can greatly reduce your risk by staying on maintained trails, using repellent, checking your skin and clothing after outdoor activities, and removing attached ticks promptly. The western blacklegged tick is the main California tick associated with Lyme disease, while other species may transmit spotted fever, tularemia, or additional infections.
California Tick Species and Where They Live
California’s tick risk changes by habitat, elevation, season, and host animals. The California Department of Public Health guide to common ticks and diseases can help you compare species, appearances, and associated illnesses.
Western Blacklegged Tick and Lyme Risk
The western blacklegged tick lives in moist coastal areas, oak woodlands, forest edges, and Sierra foothills. This species can transmit the bacteria that cause Lyme disease, with immature nymphs often difficult to spot because they are very small.
You may encounter this tick near leaf litter, grasses, shrubs, and wildlife trails. Risk is often higher in northern coastal regions and forested foothills.
Pacific Coast Tick in Coastal and Chaparral Areas
Pacific Coast ticks live across much of California, including coastal habitats, grasslands, chaparral, and areas used by livestock or wildlife. They feed on people, rodents, cattle, horses, and other animals.
A bite may cause localized irritation, fever, or headache. Some bites can produce a noticeable lesion, so monitor your skin if you notice an unusual reaction.
Rocky Mountain Wood Tick in Northeastern and Inland Areas
Rocky Mountain wood ticks appear more often in northeastern California, higher-elevation forests, and inland woodland or trail environments. They can transmit Rocky Mountain spotted fever, Colorado tick fever, and tularemia.
These ticks may also cause tick paralysis in rare cases. Check carefully after visiting brushy or wooded areas, especially where deer, rodents, or other wildlife are active.
American Dog Tick and Brown Dog Tick Around Dogs
American dog ticks live outdoors and may bite dogs, people, and other mammals. They are associated with spotted fever and tularemia in California.
Brown dog ticks are closely linked with kennels, homes, dog bedding, and yards. They can complete their life cycle indoors, so inspect your dog’s ears, neck, legs, and between the toes, and ask your veterinarian about reliable tick prevention.
Disease Risks From California Tick Bites
A tick bite does not automatically mean you will become ill, but some California ticks carry bacteria, viruses, or other pathogens. The California Department of Public Health’s tick-borne disease guidance recommends preventing bites, checking for ticks, and seeking medical advice when symptoms develop.
Lyme Disease in California
Lyme disease in California is mainly associated with western blacklegged ticks. Early symptoms may include an expanding rash, fever, chills, headache, fatigue, muscle aches, or joint pain.
The classic bull’s-eye appearance does not occur in every case. Tell a healthcare professional when and where you were bitten, whether the tick was attached, and how long it may have fed.
Spotted Fever, Colorado Tick Fever, and Tularemia
Rocky Mountain spotted fever and Pacific Coast tick fever can cause fever, headache, fatigue, muscle aches, and sometimes a rash. Colorado tick fever may cause fever, chills, headache, and body aches after exposure in mountain or inland areas.
Tularemia is less common but can cause fever, swollen lymph nodes, skin ulcers, or significant illness. Because several tick-borne conditions begin with similar symptoms, medical evaluation matters.
When Symptoms Need Medical Attention
Contact a healthcare professional promptly if you develop fever, rash, severe headache, unusual fatigue, joint or muscle pain, swollen lymph nodes, vomiting, or worsening redness after a bite. Seek urgent care for trouble breathing, confusion, weakness, facial drooping, or rapidly progressing symptoms.
When you call, mention the bite, travel or hiking location, date of exposure, and any photo or saved tick.
Tick Season and Outdoor Prevention
Ticks can be active during much of the year in California, especially after rain and in mild weather. The state prevention recommendations emphasize repellent, frequent tick checks, and prompt removal.
When Tick Activity Is Highest
Activity often increases in spring and early summer when vegetation is growing and young ticks are active. Adult western blacklegged ticks can also be active in fall and winter during cooler, wetter periods.
Use precautions year-round in suitable habitat. Weather, elevation, vegetation, and wildlife activity can change local exposure from one trail or neighborhood to another.
Reducing Exposure on Trails and in Yards
Stay near the center of maintained trails and avoid brushing against tall grass, dense shrubs, and leaf litter. Wear long pants, tuck your pants into socks, and choose light-colored clothing so ticks are easier to see.
Apply an EPA-registered repellent according to its label. Clothing treated with permethrin can provide additional protection when used exactly as directed.
After returning indoors, place clothing in a dryer if appropriate, shower, and inspect your scalp, waist, groin, armpits, behind your knees, and around your ears.
Keep grass trimmed, remove excess leaf litter, and reduce clutter near outdoor pet areas. A clear boundary between lawns and brush can also limit tick-friendly habitat.
Protecting Dogs and Other Pets
Use a veterinarian-recommended tick preventive consistently, even if your pet spends little time outdoors. Check ears, eyelids, collar areas, armpits, belly, paws, and between the toes after walks.
Remove ticks with fine-tipped tweezers and contact your veterinarian if your pet develops lethargy, fever, reduced appetite, lameness, or swollen joints. Brown dog ticks may require professional treatment of the animal, home, and sleeping areas.
What to Do After Finding a Tick
Finding a tick can feel alarming, but quick, careful action lowers the chance of prolonged attachment. Record the date and location, then check your clothing, body, children, and pets for additional ticks.
Safe Tick Removal
Use clean, fine-tipped tweezers to grasp the tick as close to your skin as possible. Pull upward with steady, even pressure without twisting, crushing, or jerking the tick.
After removal, wash your hands and clean the bite with soap and water or rubbing alcohol. Avoid petroleum jelly, heat, nail polish, or other substances intended to make the tick detach.
Monitoring the Bite and Saving the Tick if Needed
A small area of redness or irritation may appear after you remove a tick.
Watch the bite and monitor your health for several weeks. Look for an expanding rash, fever, headache, fatigue, muscle aches, joint pain, or swollen lymph nodes.
You can dispose of the tick in alcohol, seal it in a container, or flush it down the toilet.
If a healthcare professional asks for identification, place the tick in a sealed container or bag. Label it with the date and location.
