Are There Ticks in California?
Yes, ticks are established throughout California in diverse habitats ranging from coastal regions to mountain forests. Western black-legged ticks and American dog ticks are the most common species. Tick activity varies by region and elevation, with spring through fall being peak season. California's large size and diverse climates mean tick prevalence differs significantly across the state.
By Tim, founder of Easy Street Markets. I maintain the wildlife database and verify every animal and source myself. Updated July 22, 2026.
American Dog Tick · Nova Patch CC BY-SA
American Dog Tick · Matthew Lindsey CC BY
Asian Longhorned Tick · Zachary Dankowicz CC BY
- 6,579
- GBIF records
Yes, ticks are in California. Next you'll want:
Verified species, source iNaturalist
9 types of ticks recorded in California
9 tick species have a verified observation record in California, each with at least 10 confirmed sightings. The full list, ranked by how often each is recorded, is below.
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Bighorn Sheep Tick
Dermacentor hunteri
26 records
Plus 8 more recorded only rarely (fewer than 10 verified sightings). Counts from verified iNaturalist observations.
Yes, ticks are established throughout California in diverse habitats ranging from coastal regions to mountain forests. Western black-legged ticks and American dog ticks are the most common species. Tick activity varies by region and elevation, with spring through fall being peak season. California's large size and diverse climates mean tick prevalence differs significantly across the state.
Are they in California?
Yes, ticks are established throughout California, though populations vary significantly by region and elevation. California's diverse climates support multiple tick species in different areas. Western black-legged ticks, which can carry Lyme disease, are found particularly in coastal regions and northern California's forests. American dog ticks are widespread statewide in grasslands, scrubland, and coastal areas. Ixodes ticks are present in forested regions, especially in the Sierra Nevada and coastal ranges. Tick presence is highest in forested and brushy areas with adequate moisture, particularly in northern California, the coast redwood regions, and higher elevations. Southern California has lower tick populations overall due to the drier climate, though ticks are still encountered in chaparral, oak woodlands, and in coastal sage scrub.Tick in Californiapopulations are heaviest in the Sierra Nevada foothills, coastal regions, and mixed conifer forests. If you spend time hiking or camping in California's forests, especially in spring and early summer, you should take tick precautions.
How dangerous is it?
Tick bites in California can transmit Lyme disease, Rocky Mountain spotted fever, and other tick-borne illnesses. Western black-legged ticks, which are more commonly infected with Lyme disease pathogens than other California ticks, present a specific concern in certain regions. The actual risk from a single tick bite is low for most people, especially when the tick is removed promptly. Fever, rash, joint pain, or fatigue after a tick bite warrant medical attention, but these conditions are treatable with antibiotics when diagnosed early. Serious complications from tick-borne illness are uncommon in California, particularly with prompt removal and medical care. Most tick bites cause only mild local irritation and redness. Children and elderly individuals should take extra precautions. California's size means that risk levels vary significantly by region. Coastal regions and northern forests have higher disease prevalence than southern California. The key to safety is early removal of ticks and medical attention if symptoms develop.
How to recognize one
Ticks are small arachnids with eight legs and flat, oval bodies when unfed. Unfed ticks are often the size of a sesame seed or smaller, while engorged ticks swell to the size of a raisin. Western black-legged ticks are small, dark brown to black, and are often smaller than American dog ticks. American dog ticks are larger and reddish-brown with lighter markings on their backs. Ixodes ticks are small and dark, ranging from brown to black. Ticks hide in tall grass, brush, leaf litter, and on vegetation in forested and scrubby areas. They wait on leaves and branches for a passing animal or person to brush against them. You are unlikely to feel a tick when it first attaches.California wildlifehabitats, from the Sierra Nevada to the coast redwoods to the chaparral, all harbor ticks in suitable microhabitats. After hiking in tick-prone areas, carefully inspect your entire body, paying special attention to hidden areas like behind your ears, under your arms, in your hair, and between your toes.
What to do if you are bitten or stung
Stay calm if you find a tick on your skin. Remove it as soon as possible using tweezers or a tick removal tool. Grasp the tick close to its mouth parts and pull straight out with steady, gentle pressure. Do not twist, squeeze, or jerk the tick, as this can cause the mouth parts to break off and remain embedded in your skin. After removal, clean the bite area with soap and water or rubbing alcohol. You can dispose of the tick by placing it in a sealed bag, flushing it, or crushing it. Some people preserve ticks for testing if illness develops later, which can be helpful for diagnosis. Watch the bite area over the next few days for signs of infection or an expanding rash. This is general information, not medical advice; if you are bitten, call Poison Control at 1-800-222-1222, or 911 if symptoms are severe. Do not use nail polish, petroleum jelly, or heat to remove a tick, as these methods are ineffective. Seek medical care if you develop fever, rash, joint pain, or muscle aches in the weeks after a bite.
How to prevent encounters
The best strategy is to prevent tick encounters in the first place. When hiking in California's forests or scrubby areas, stay on established trails and avoid walking through tall grass, brush, and thick vegetation. Wear long pants tucked into your socks and long sleeves when possible, especially during peak tick season from April through October. Light-colored clothing makes ticks easier to spot before they attach. Apply insect repellent containing DEET to exposed skin before heading outdoors. Permethrin applied to clothing, gear, and boots is particularly effective at repelling and killing ticks. After spending time outdoors, inspect your entire body carefully, paying special attention to hidden areas like behind your ears, armpits, groin, and between your toes. Shower and wash your clothes in hot water after outdoor activities. Clear brush, dead wood, and leaf litter from around your home.Our wildlife guidesinclude additional prevention strategies for managing outdoor wildlife risks. Trim vegetation away from structures and remove or elevate woodpiles. Keep grass mowed short around your property.
Where in California and when
Ticks in California are found in diverse habitats statewide, with distribution varying by species. Northern California's mixed conifer forests, including areas around the Sierra Nevada and coastal redwood regions, have abundant tick populations. Coastal regions and the California Coast Ranges harbor Western black-legged ticks. Southern California's chaparral, oak woodlands, and higher elevations support tick populations, though overall densities are lower than in the north. Tick season in California varies by region. In northern and coastal areas, ticks are active from roughly March through November, peaking in spring and early summer. Southern California has a more extended season due to milder winters. Peak activity occurs from April through June in most regions, with secondary peaks in fall.Wildlife in Californiaexists in extremely diverse ecosystems where tick presence varies dramatically by microhabitat. Higher elevations and coastal regions tend to have higher tick populations than inland deserts and low-elevation scrub. Winter reduces tick activity statewide, though coastal ticks may remain active year-round in mild years.
Harmless lookalikes
Ticks are distinctive enough that they are rarely confused with other creatures in California. Small mites, lice, or other arthropods might occasionally cause concern, but they differ significantly from ticks. Mites are generally much smaller than ticks and have different body structures. Seed ticks, which are unfed baby ticks, might look similar to other tiny arthropods, but they have the characteristic eight-legged tick body shape. Most small parasites or bites are far more likely to be harmless spider bites, chiggers, or other insects rather than ticks. California's diverse arthropod fauna means that many small bugs people encounter are entirely benign. If you are unsure about an insect, you can photograph it or place it in a container for a doctor or local extension office to identify.More on Tick in Californiaincludes detailed identification resources to help distinguish real ticks from harmless lookalikes. The good news is that California's medical infrastructure means tick-borne illness, when it occurs, is typically diagnosed and treated promptly.
Frequently Asked Questions
Are ticks deadly? Tick bites themselves are rarely fatal, though ticks can transmit serious diseases like Lyme disease. Deaths from tick-borne illness are uncommon in California and across the US, and most cases are treatable with antibiotics. How common are tick bites in California? More common in northern and coastal regions than in southern California due to climate and tick distribution. Most hikers in forested areas will encounter at least one tick per season. What attracts ticks to an area? Ticks are attracted to wildlife, particularly deer, and to areas with brush, grass, and moisture. Removing brush and maintaining clear ground around your home reduces tick presence. What should I do if I see one? Remove it immediately using tweezers, pulling straight out gently and completely. Clean the area with soap and water, and watch for signs of rash or fever over the next two weeks.California wildlife guideprovides additional resources for managing wildlife concerns. If you develop symptoms after a tick bite, seek medical attention promptly.
Plan your tick sighting in California
6,579 verified tick records have been logged in California, most recently in 2026. See the GBIF records.
Where to look in California
- Alcatraz Island · Wildlife Watching, Birdwatching · Find hotels
- Cabrillo National Monument · Wildlife Watching, Birdwatching · Find hotels
- Channel Islands National Park · Wildlife Watching, Birdwatching · Find hotels
- Death Valley National Park · Wildlife Watching, Birdwatching · Find hotels
- Devils Postpile National Monument · Wildlife Watching · Find hotels
- Golden Gate National Recreation Area · Wildlife Watching, Birdwatching · Find hotels
Frequently asked questions
Are they in California?+
Yes, ticks are established throughout California, though populations vary significantly by region and elevation. California's diverse climates support multiple tick species in different areas. Western black-legged ticks, which can carry Lyme disease, are found particularly in coastal regions and northern California's forests. American dog ticks are widespread statewide in grasslands, scrubland, and coastal areas. Ixodes ticks are present in forested regions, especially in the Sierra Nevada and coastal ranges. Tick presence is highest in forested and brushy areas with adequate moisture, particularly in northern California, the coast redwood regions, and higher elevations. Southern California has lower tick populations overall due to the drier climate, though ticks are still encountered in chaparral, oak woodlands, and in coastal sage scrub.Tick in Californiapopulations are heaviest in the Sierra Nevada foothills, coastal regions, and mixed conifer forests. If you spend time hiking or camping in California's forests, especially in spring and early summer, you should take tick precautions.
How dangerous is it?+
Tick bites in California can transmit Lyme disease, Rocky Mountain spotted fever, and other tick-borne illnesses. Western black-legged ticks, which are more commonly infected with Lyme disease pathogens than other California ticks, present a specific concern in certain regions. The actual risk from a single tick bite is low for most people, especially when the tick is removed promptly. Fever, rash, joint pain, or fatigue after a tick bite warrant medical attention, but these conditions are treatable with antibiotics when diagnosed early. Serious complications from tick-borne illness are uncommon in California, particularly with prompt removal and medical care. Most tick bites cause only mild local irritation and redness. Children and elderly individuals should take extra precautions. California's size means that risk levels vary significantly by region. Coastal regions and northern forests have higher disease prevalence than southern California. The key to safety is early removal of ticks and medical attention if symptoms develop.
More wildlife in California