Oregon Tick Season: Peak Times, Dangerous Species, and Proven Prevention Steps

Tick season in Oregon is more active than many residents expect — and it starts earlier in the year than most people realize. Ticks in Oregon are most active from March to June, with some species experiencing a secondary active period in the fall. Whether you’re hiking the Columbia River Gorge, camping east of the Cascades, or simply spending time in your backyard, the risk of a tick encounter is real.

The good news is that with the right knowledge and a few consistent habits, you can enjoy Oregon’s stunning outdoors without putting your health at serious risk. This guide covers everything you need to know about tick season in Oregon — from peak timing and species identification to disease risks, prevention, and what to do if you find one attached to your skin.

Key Insight: Finding ticks within the first 12 hours after attachment reduces the chances of transmitting disease. Early detection is your most powerful tool.

When Is Tick Season in Oregon

“In Oregon, adult ticks are active primarily in the spring and early summer, but also can be found in the fall,” according to Philippe Rossignol, professor in the fisheries and wildlife department at Oregon State University. While ticks can potentially be active year-round, their peak season typically runs from March through August.

They are more active from March to June, but in the west Gorge, ticks can be active in winter. This means that in some parts of western Oregon, there is effectively no true “off-season” for tick activity. You should stay vigilant any time you’re outdoors in wooded or grassy areas, even during the cooler months.

Most cases occur in the summer months; however, ticks thrive in humid environments where moisture is readily available — conditions Oregon provides in abundance. Because ticks are highly susceptible to drying out, they depend on a certain level of humidity to survive and remain active. Weather patterns that bring mild temperatures and moisture can significantly extend their season and increase the risk of exposure.

Warmer, milder winters are giving ticks an earlier start in the spring and allowing them to linger well into fall. We can expect ticks to appear in different places, at different times, in different numbers, and with different diseases than they carry today as climate patterns continue to shift. This makes it more important than ever to understand tick behavior throughout the year, not just at peak season.

Pro Tip: Don’t wait until summer to start tick prevention. In western Oregon, tick activity can begin as early as January or February during mild winters. Start checking yourself and your pets as soon as you spend time outdoors in early spring.

Types of Ticks Found in Oregon

The U.S. alone is home to nearly 100 tick species, with about 20 found in Oregon. About 20 species of hard ticks are found in Oregon, but only four are known to prey on humans: the western black-legged tick, Rocky Mountain wood tick, American dog tick, and Pacific Coast tick. Understanding which species you might encounter — and where — can help you assess your risk level.

Here’s a closer look at each of the four species most relevant to your health:

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. In Oregon, the causative organism, Borrelia burgdorferi, is transmitted by the bite of a small brown-black tick, Ixodes pacificus, known as the Western black-legged tick or deer tick. It is present in Western Oregon and along the Columbia River in lower elevations.

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. American dog ticks are common throughout Oregon, favoring open spaces and trails. The Pacific Coast tick is mainly found along Oregon’s coast and some inland areas.

It’s also worth knowing about the soft tick, Ornithodoros hermsi, which behaves very differently from hard ticks. Soft ticks hide out in rodent nests at elevations over 1,500 feet and can bite briefly and painlessly at night while you sleep. These ticks can transmit soft tick relapsing fever. Understanding how ticks reproduce can also help you understand why populations can surge after mild winters.

Important Note: Another concern is the Asian longhorned tick, which was found in the Eastern United States in 2017. Since then, it has spread as far west as Arkansas and Missouri. If you or your animals have recently traveled to the eastern U.S., check carefully for this species before returning home.

Tick-Borne Diseases in Oregon

Lyme disease, a bacterial disease, and other diseases spread by ticks have been found in Oregon. Other diseases spread by ticks in Oregon include tick-borne relapsing fever, Rocky Mountain spotted fever, tularemia, and Colorado tick fever. Cases of these diseases being contracted by tick bites in Oregon are very rare but something to be aware of.

Lyme disease is the most common tick-borne disease in Oregon with about 65 human cases per year. It is caused by the spirochete Borrelia burgdorferi. Typical short-term symptoms include headache, fever, fatigue, and muscle pain that can be characteristic of the flu. A key diagnosis point is a distinctive “bulls-eye” rash, where the redness assumes a ring-shaped pattern that appears a day to a month after the tick bite. Unfortunately, the rash isn’t always ring-shaped, and some people get no rash at all.

Black-legged ticks transmit a variety of diseases including Borrelia burgdorferi and B. mayonii (which cause Lyme disease), Anaplasma phagocytophilum (anaplasmosis), B. miyamotoi disease (a form of relapsing fever found on the west coast), and on the east coast, ehrlichiosis, babesiosis, and Powassan virus disease. You can learn more about one of the more serious conditions in this group by reading about tick-borne encephalitis.

About 3–4 cases of soft tick relapsing fever are reported each year in Oregon among patients who were typically exposed on the east side of the Cascades, above 1,500 feet elevation. In addition to transmitting Colorado tick fever, the Rocky Mountain wood tick also can transmit Rocky Mountain spotted fever, tularemia, and Q fever.

• Lyme disease: Most common tick-borne illness in Oregon; symptoms include fatigue, fever, joint aches, and sometimes a bullseye rash
• Rocky Mountain spotted fever: Transmitted by Rocky Mountain wood ticks and American dog ticks; the most lethal tick-borne disease in the United States with a mortality rate of 5% to 10%
• Anaplasmosis: An uncommon tick-borne disease in Oregon with 1–2 cases per year
• Soft tick relapsing fever: Caused by Borrelia hermsii; associated with rodent-infested cabins above 1,500 feet elevation
• Colorado tick fever: Viral disease transmitted by Rocky Mountain wood ticks in eastern Oregon
• Tularemia: Rare but serious bacterial infection; can be transmitted by several Oregon tick species

Important Note: Some tick-borne diseases, such as Rocky Mountain spotted fever, require immediate treatment. If you develop a fever, rash, or flu-like symptoms within 30 days of a tick bite, contact your healthcare provider right away. Early treatment with antibiotics is highly effective.

High-Risk Areas and Habitats in Oregon

Ticks are found all across Oregon. Though they are most common east of the Cascades and in Southern Oregon — and most cases of Lyme disease have been reported in Hood River and Josephine Counties — climate change will affect their range. No region of the state is entirely tick-free, so awareness matters wherever you spend time outdoors.

In Oregon, ticks tend to be found east of the Cascades and in Southern Oregon. They tend to be at lower elevations. Some areas where they’re common include Dog Mountain, Catherine Creek, McCall Preserve, and the Dalles Mountain Ranch in the Columbia River Gorge and along the Rogue River.

Ticks don’t roam widely — they wait. “When ticks seek a host, they perch on low branches of shrubs or tall grass and wait to attach to a passing bird, animal, human, or even reptile,” said Philippe Rossignol, a retired professor from Oregon State University’s fisheries and wildlife department. This behavior, called “questing,” means your risk is highest wherever vegetation is dense and untrimmed.

High-risk habitats in Oregon include:

• Wooded areas and forest edges, especially in the Columbia River Gorge
• Tall grass, brush, and shrubland east of the Cascades
• Open meadows and trails at mid-to-high elevations
• Rodent-infested cabins above 1,500 feet (for soft tick exposure)
• Your own yard, especially near wood piles, leaf litter, or wildlife corridors

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. Even suburban yards near green spaces can harbor ticks, especially if deer, raccoons, or other wildlife pass through regularly. This is especially relevant to consider if you enjoy activities like dove hunting in Oregon, where you’re often moving through dense brush and tall grass.

Deer ticks love to live in moist, shady areas at ground level. They cling to bushes, tall grass, and shrubs at ground level and will not stay at a height more than 18–24 inches from the ground. This means you’re most at risk from the knees down — another reason to tuck your pants into your socks on trail walks.

How to Protect Yourself, Children, and Pets During Tick Season in Oregon

Protection during tick season comes down to layering your defenses — covering your skin, using repellents, checking yourself after outings, and managing your yard. People who work or play outdoors often should perform daily tick checks on themselves and their children. Ticks can also be carried indoors on pets, clothing, or outdoor gear.

Protecting Yourself and Children

Keep ticks off your skin by wearing long-sleeved shirts, tucking pant legs into socks, and wearing closed-toe shoes. Choose light-colored clothing so it’s easier to spot ticks. Use approved tick repellents according to the label directions.

• Treat clothing and gear with products containing 0.5% permethrin.
• Use EPA-registered insect repellents containing DEET, picaridin, IR3535, Oil of Lemon Eucalyptus (OLE), para-menthane-diol (PMD), or 2-undecanone.
• Do not use insect repellent on babies younger than 2 months old. Do not use products containing OLE or PMD on children under 3 years old.
• Tumble dry clothes in a dryer on high heat for 10 minutes to kill ticks on dry clothing after you come indoors.
• Showering within two hours of coming indoors has been shown to reduce your risk of getting Lyme disease and may be effective in reducing the risk of other tick-borne diseases. Showering may help wash off unattached ticks and is a good opportunity to do a tick check.

Ticks tend to migrate to warmer parts of the body, so check your armpits, groin, hair and scalp, and behind the ears and knees. After going into natural areas, especially edges of wooded areas and forest openings, check yourself for ticks. They tend to wedge themselves in places like waistbands or at the edge of the hairline, but they can be anywhere.

Protecting Your Pets

Year-round tick protection for dogs is more important than ever. Preventive measures not only protect individual pets but also help reduce the overall spread of tick-borne diseases like Lyme disease across our communities. For more detailed guidance on keeping your dog safe, check out these tips for preventing tick-borne diseases in your dog.

• Oral tick prevention is recommended for dogs and topical solutions for cats.
• Always check yourself and your pets for ticks after spending time in tall grass, wooded, or brushy areas. Brush your dog after such outings, taking care to check skin folds and tick hiding areas such as armpits, groin, ears, and under collars.
• When checking pets, be thorough. Ticks can hide anywhere — from under collars and between toes to around ears and tails.
• Vaccines are also available as a preventive tool for dogs against Lyme disease — ask your veterinarian if this is appropriate for your pet.

You can also learn more about natural population control by reading about animals that eat ticks, which play a helpful role in keeping tick numbers in check in the wild.

Protecting Your Yard

Ticks in your yard can be reduced by removing leaf litter, clearing tall grasses and brush, and keeping wildlife out of your yard. Creating a tick-safe zone around your home is one of the most effective long-term strategies, especially if you have children or pets who spend time outside regularly.

Common Mistake: Many people assume ticks only live in forests and wilderness areas. Many people get ticks in their own yard or neighborhood. Don’t skip tick checks just because you haven’t been on a trail.

What to Do If You Find a Tick in Oregon

Finding a tick on your body can be alarming, but staying calm and acting quickly is the most important thing you can do. A tick usually needs to be attached for a day or two in order to transmit a disease to its host, so early detection will help keep you safe.

Step-by-Step Tick Removal

1. Disinfect the area first. Before touching the tick, clean the bite area with rubbing alcohol.
2. Use fine-tipped tweezers. Use fine-tipped tweezers to grasp the tick as close to the skin’s surface as possible. Pull upward with steady, even pressure to ease out the entire tick including the tick’s mouthparts. Don’t twist or jerk the tick; this can cause the mouthparts to break off and remain in the skin.
3. Don’t panic if the head breaks off. If the tick’s head breaks off and remains in the skin, experts say this is OK. Tick-borne diseases cannot transmit without the tick’s body.
4. Clean the bite again. Once the tick is off, disinfect the area again with rubbing alcohol.
5. Save the tick for identification. Place the tick in a small container of alcohol labeled with the date removed and the place it was picked up.

Important Note: Never remove a tick by burning it, smothering it with petroleum jelly, or twisting it. These methods can cause the tick to release more saliva into the bite wound, potentially increasing the risk of disease transmission.

After Removal: What to Watch For

Visit a doctor if you have any of the following symptoms within 30 days of a tick bite. Note that not all patients who have contracted a disease from a tick bite have symptoms within 30 days. Key symptoms to monitor include:

• Fever or chills
• Headache or muscle aches
• Fatigue that is unusual or persistent
• A rash of any kind — about 40% of people present with a rash, and it is not always a bullseye shape
• Joint pain or swelling
• Cardiac rhythm change — seek immediate medical attention

For tick identification, Philippe Rossignol, professor in the fisheries and wildlife department at Oregon State University, recommends first contacting OSU Extension county offices, to help identify ticks. Ticks can be preserved by placing them in a sealed container with enough isopropyl alcohol to cover the tick, or by placing them in a sealed bag in the freezer.

Reporting Tick Bites and Tick-Borne Illness in Oregon

If you’ve been bitten by a tick in Oregon and develop symptoms, reporting your case helps public health officials track disease trends and protect your community. Oregon has a network of resources available to help you navigate the process.

Who to Contact

• Oregon Health Authority (OHA): Your healthcare provider can contact the OHA on-call epidemiologist at 971-673-1111 for clinical consultation and testing for tick-borne diseases including soft tick relapsing fever, hard tick relapsing fever, and other conditions. Always consult your primary care provider when you are feeling ill and suspect you’ve contracted a tick-borne disease.
• Oregon Lyme Disease Network: Contact them at 541-321-6536. They can help identify the tick and provide medical resources.
• OSU Insect ID Clinic: You can submit tick samples to the OSU Insect ID Clinic, which identifies what kind of tick has been removed from humans or pets. The clinic cannot, however, identify if the tick carries the Lyme disease bacterium.
• Your county health department: Your county health department may be able to help identify ticks. It’s best to call first to see if they have staff with the expertise to assist you.

Why Reporting Matters

Spotted fever group rickettsiosis, ehrlichiosis, and anaplasmosis are all reportable conditions in the United States. It is important that providers check with their local health departments for an accurate list of reportable conditions. When your healthcare provider reports a confirmed tick-borne illness, it contributes to statewide surveillance data that helps track where and when tick activity is increasing — including the concerning trend that tick-borne diseases in Central Oregon have been increasing over time.

You can also visit the Oregon Health Authority ticks page directly for updated disease information, tick identification resources, and guidance on when to seek care. The CDC’s tick information resource is another reliable reference for national context on tick-borne disease symptoms and prevention.

Pro Tip: Reach out to your medical provider if you have difficulty removing the tick or develop any fever, rashes, aches, or unusual symptoms after a tick bite. Don’t wait to see if symptoms resolve on their own — early treatment with antibiotics is far more effective than delayed treatment.

Tick season in Oregon is a manageable challenge when you’re informed and prepared. By understanding when ticks are most active, which species pose the greatest risk, and how to protect yourself and your family, you can spend time in Oregon’s beautiful outdoors with confidence. Make tick checks a routine part of every outdoor adventure — for yourself, your children, and your pets — and you’ll significantly reduce your chances of a tick-related health issue this season and beyond.