Are There Ticks in Oregon? A Guide to Oregon Tick Species

Ticks are widespread parasites in North America and can feed on various hosts. These bloodsucking arachnids feed on many animals, including reptiles, birds, mammals, and even humans.

If you spend much time outdoors in Oregon, you may have encountered these tiny pests, either on yourself or your pet. Although tick encounters may be more common in specific regions, understanding the tick species in your area is crucial for keeping yourself, your family, and pets safe. Here’s what you need to know about the tick species that call Oregon home.

Does Oregon Have Ticks?

Like most places in North America, Oregon has a diverse tick population. Ticks belong to the Ixodida order, one of the largest groups of arachnids, with over 800 species worldwide. The U.S. alone is home to nearly 100 tick species, with about 20 found in Oregon. Of these, only a handful commonly prey on humans or carry disease causing agents.

How Common Are Ticks in Oregon?

Ticks can be found throughout Oregon, particularly in areas with grassy fields, dense vegetation, or wooded habitats. These resilient arachnids thrive in both urban and rural areas, adapting well to the varied landscapes across the state. It's wise to stay vigilant outdoors, especially in spring, early summer, and fall when tick activity peaks for most species.

Types of Ticks in Oregon

Understanding Oregon's tick species can help you stay safe, whether you're hiking in the woods or just spending time in your backyard. Here are the most common human encountered tick species in Oregon, along with tips on identifying them and understanding their risks.

The Western Black-Legged Tick

As Oregon's primary Lyme disease carrier, the western black-legged tick is the most critical tick species for public health. While not all western black-legged ticks carry Lyme disease, it’s estimated that around 1-5% in Oregon do. These ticks are most active in spring, early summer, and fall, waiting on tall grasses as well as small wooded plants and twigs for a potential host.

The Rocky Mountain Wood Tick

Found in forested and shrubland areas across Oregon, the Rocky Mountain wood tick looks similar to the American dog tick. It is primarily active in spring through early summer, and is often found at higher elevations.

The American Dog Tick

Common in grassy and wooded areas throughout Oregon, the American dog tick favors open spaces and trails. Early lifestages like larvae and nymphs feed on small mammals, while adults target larger hosts, including humans and pets. Though they do not transmit Lyme disease, these ticks can carry Rocky Mountain spotted fever and other bacterial and viral infections.

The Pacific Coast Tick

The Pacific Coast tick is most frequently found along Oregon’s coast and some inland areas. While generally less common than other species, it may carry pathogens associated with tularemia and spotted fever rickettsiosis, which can pose health risks to humans.. It also favors animals such as deer, horses, and cattle, making it a concern for both public and agricultural health.

The Brown Dog Tick

Unique among Oregon's ticks, the brown dog tick prefers indoor habitats and is often found in and around human dwellings. Known to spread diseases in dogs, such as Rocky Mountain spotted fever, these ticks are a greater threat to pets than to humans. Check your pets regularly, as brown dog ticks can quickly infest homes and kennels.

When Is Tick Season in Oregon?

Ticks in Oregon are most active from March to June, with some species experiencing a secondary active period in the fall. The exact timing can vary depending on the species, but spring and early summer are generally when tick activity peaks. However, it’s possible to encounter ticks year-round in milder parts of the state.

Staying Safe Doesn't Have to Be Difficult

While ticks are a natural part of the Oregon landscape, they don’t have to keep you from enjoying the outdoors. Prevent tick bites by wearing proper clothing and using insect repellents and perform tick checks after spending time outdoors Insect Shield offers permethrin-treated clothing designed to kill ticks on contact, helping make outdoor activities more enjoyable.