New Jersey Tick Identification Guide
Learn the visual clues that separate black-legged, lone star, and American dog ticks — the three species New Jersey homeowners encounter most often.
The Three Ticks That Matter in New Jersey
Dozens of tick species exist in the United States, but in New Jersey yards, parks, and trails, three do the vast majority of the biting: the black-legged tick (also called the deer tick), the lone star tick, and the American dog tick. Learning to tell them apart helps you judge risk and respond appropriately after a bite.
Ticks have three active life stages — larva, nymph, and adult — and they get larger at each stage. All three stages of the lone star tick bite people aggressively; for the black-legged tick, the tiny nymph stage causes most Lyme disease cases.
Key fact: not every tick carries disease. Infection rates vary by species, life stage, and location. A bite is a reason to watch and act — not a reason to panic.
Black-Legged Tick (Deer Tick) — Ixodes scapularis
The black-legged tick is the species most associated with Lyme disease in New Jersey, and the one to learn first.
What it looks like
- Adult female: reddish-orange body with a black shield behind the head and black legs; about the size of a sesame seed when unfed.
- Adult male: smaller, uniformly dark brown or black.
- Nymph: about the size of a poppy seed, translucent to grayish — very easy to miss. This stage is responsible for most Lyme disease transmissions.
- Larva: even smaller, with only six legs. Larvae that have never fed are not considered a Lyme risk.
Where you find it in NJ yards
Shaded, humid spots: leaf litter, wooded edges, tall grass along property lines, groundcover beds, and stone walls. They climb vegetation and wait with front legs outstretched — a behavior called “questing.”
Diseases it can carry
- Lyme disease — the most common tick-borne illness in NJ
- Anaplasmosis — flu-like illness affecting white blood cells
- Babesiosis — a parasite that infects red blood cells
A single black-legged tick can carry more than one of these, which is one reason symptoms after a bite deserve prompt medical attention. See our Lyme Disease Symptom Checklist.
Lone Star Tick — Amblyomma americanum
The lone star tick is an aggressive biter — and unlike some species, its larvae, nymphs, and adults all readily bite people.
What it looks like
- Adult female: reddish-brown with a single distinctive white dot on her back.
- Adult male: white markings around the edge of the body, no central dot.
- Nymphs (“seed ticks”): tiny and numerous; often noticed only when several are biting at once.
Where you find it in NJ yards
Wooded areas, brush, and overgrown edges. Lone star ticks actively move toward hosts rather than just waiting, so they can show up in yards bordering woods and trails.
Diseases and conditions it can carry
- Ehrlichiosis — flu-like illness that can become serious without treatment
- STARI (Southern tick-associated rash illness) — causes a Lyme-like rash
- Alpha-gal syndrome — a delayed allergic reaction to red meat that can develop after a bite
American Dog Tick — Dermacentor variabilis
The largest and easiest to spot of the three, the American dog tick is common along trails, in grassy fields, and at the edges of lawns.
What it looks like
- Noticeably larger than a deer tick — adults are roughly the size of a watermelon seed.
- Brown body with ornate white or grayish markings on the back (the scutum).
- Adults are the stage most likely to bite people, mainly in spring and early summer.
Where you find it in NJ yards
Grassy areas, along paths and trails, and on vegetation at knee height where it quests for passing hosts — including dogs.
Diseases it can carry
- Rocky Mountain spotted fever — a potentially serious illness that responds well to early treatment
- Tularemia — a less common bacterial infection
Quick Comparison
- Smallest and hardest to see: black-legged tick nymph (poppy seed)
- White dot on back: lone star tick female
- Largest, ornate white markings: American dog tick
- Most aggressive biter: lone star tick (all life stages)
- Most linked to Lyme disease: black-legged tick
Found a Tick and Not Sure What It Is?
Remove it promptly using the steps in What to Do After a Tick Bite, save it in a sealed bag with the date, and monitor yourself for symptoms for 30 days. If you develop a rash, fever, or flu-like symptoms, contact your doctor and mention the bite — bringing the saved tick can help the conversation.
This guide is for educational purposes only and isn’t medical advice. If you’ve been bitten or have symptoms, contact your doctor or local health department.