New Hampshire ranks #3 nationally for Lyme disease. CDC data from April 2026 shows tick bite ER visits at their highest level since 2017. If you live in Dover, Portsmouth, Rochester, or Somersworth — your yard is a primary exposure risk. Here's what works.
Lyme disease is a bacterial infection caused by Borrelia burgdorferi, transmitted to humans through the bite of infected blacklegged ticks — called deer ticks — which are the primary tick species in New Hampshire.
Lyme is the most reported vector-borne illness in the United States and the Northeast is its epicenter. New Hampshire, Massachusetts, Connecticut, and Maine consistently rank in the top states for incidence. The CDC estimates 476,000 Americans are diagnosed annually — and the real number is likely higher because Lyme is notoriously underdiagnosed.
What makes Lyme particularly dangerous in the Seacoast region is habitat. The combination of wooded lots backing up to residential properties, high deer density, the Great Bay estuary wetlands, and NH's mild-enough winters for tick survival creates ideal conditions. This isn't a rural problem — it's a backyard problem.
CDC April 2026 data shows tick bite-related ER visits in New Hampshire at their highest level since 2017. The Seacoast region — Strafford and Rockingham counties — represents two of the state's highest-risk counties for confirmed Lyme cases.
Understanding transmission helps you understand why yard treatment is the most effective prevention — not personal protective measures alone.
Deer ticks wait in vegetation — grass tips, leaf edges, shrub bases — with front legs extended in a behavior called "questing." They detect body heat, CO₂, and vibration. They don't jump or fly. You walk into them, or they drop from low branches.
Once on skin, the tick finds a spot and begins feeding — painlessly, since tick saliva contains an anesthetic. This is why most tick bites go unnoticed. The tick must stay attached for 36–48 hours before Lyme bacteria are transmitted from its gut into the bloodstream.
Nymph ticks — the juvenile stage that peaks in May and June — are the most dangerous. They're poppy-seed sized (1–2mm), most likely to be missed, and have the highest rate of Lyme infection. Most human Lyme cases are attributed to nymph bites, not adult tick bites.
The 36–48 hour transmission window is why daily tick checks help — but also why eliminating ticks in your yard is more reliable than relying on personal checks alone. A tick you don't notice is a tick you won't remove in time.
Personal protective measures — tick checks, DEET, tucked-in clothing — are useful but imperfect. Yard treatment eliminates tick populations before you encounter them.
Research cited by the CDC shows professional yard treatment targeting tick habitat zones reduces tick populations by 68–88% in treated areas. For a family that uses their yard regularly, that's the difference between multiple exposure opportunities per week and near-zero.
The key insight is where to treat. Ticks don't live in mowed lawn — they live at the edges: the 6-foot transition zone between your grass and the woods, stone wall gaps where mice travel, leaf litter that stays damp, ornamental shrub bases with ground cover. A treatment that blankets the open lawn and skips the edges is mostly theater.
EPA-registered barrier treatments applied to the actual tick habitat zones on your property — wooded edges, stone walls, leaf litter, shrub bases. Reduces tick populations 68–88% in treated areas. Requires 3–4 applications per season timed to NH's tick activity calendar.
Check all family members (and pets) after outdoor activity — especially armpits, groin, behind the knees, and the scalp. A tick attached under 24 hours almost never transmits Lyme. Find it fast and remove it properly (fine-tipped tweezers, firm upward pull, don't twist).
DEET-based repellents (20–30% DEET) on exposed skin, permethrin-treated clothing for longer outdoor activities. Tuck pants into socks in wooded areas. Light-colored clothing makes ticks easier to spot. These reduce exposure but don't eliminate tick contact.
3-foot wood chip or gravel barrier between lawn and wooded areas slows tick migration. Keep leaf litter raked. Stack wood piles neatly, away from the house. Mow regularly. These reduce tick habitat but don't replace treatment — they make treatment more effective.
NH ticks are active longer than most homeowners realize — from late March through November. Here's when the risk spikes and what to do each month.
Early detection and treatment matters enormously with Lyme disease. Late-stage Lyme — when it reaches the joints and nervous system — is far harder to treat. Know what to look for.
A circular expanding rash appearing 3–30 days after a tick bite, often at the bite site. Present in 70–80% of cases — but not always. The rash may be solid red or have a clearing in the middle (the classic bullseye). Not itchy or painful. If you see this, see a doctor immediately — don't wait.
Fever, chills, headache, fatigue, muscle and joint aches appearing weeks after a known tick bite or outdoor exposure. These early symptoms overlap with many conditions, which is why Lyme is often misdiagnosed. If you've had recent outdoor exposure and develop these symptoms, mention it to your doctor.
Untreated Lyme in later stages causes arthritis-like swelling and pain in large joints — particularly the knees. Pain typically shifts between joints. This is a later-stage symptom appearing weeks to months after initial infection. By this stage, treatment is more complex.
Late-stage Lyme can affect the nervous system: facial palsy (Bell's palsy), numbness or tingling in hands and feet, short-term memory issues, difficulty concentrating ("brain fog"). These neurological symptoms indicate Lyme has spread — treatment at this stage requires IV antibiotics.
Some Lyme cases cause Lyme carditis — an irregular heartbeat, heart block, or palpitations. Rare but serious. Lyme carditis has caused sudden cardiac death in young people who had untreated Lyme. Any unexplained cardiac symptoms after outdoor tick exposure warrant immediate evaluation.
Dogs are highly susceptible to Lyme disease — and unlike cats, they go into the same tick habitat zones as your kids. Canine Lyme can cause Lyme nephritis (kidney failure), which is often fatal. Signs include limping, lethargy, swollen joints, and loss of appetite. Year-round tick prevention for dogs is critical in Seacoast NH.
If you find an embedded tick or develop a bullseye rash or flu-like symptoms after outdoor exposure, see a doctor promptly. Early Lyme is reliably treated with a 2–4 week course of oral antibiotics. Do not wait for the rash — roughly 20–30% of cases have no visible rash. Tell your doctor about tick exposure.
The questions we hear most often from Seacoast NH homeowners.
Tick season in New Hampshire runs from late March through November. Peak nymph season — when ticks are hardest to spot and most likely to transmit Lyme — falls in May and June. Adult ticks are most active in April–May and again in October–November. The season is longer than most homeowners expect.
Professional yard treatment targeting tick habitat zones (wooded edges, stone walls, leaf litter) reduces tick populations by 68–88% in treated areas, according to CDC-cited research. It is the most effective single intervention for reducing residential Lyme exposure risk — more reliable than personal protective measures alone because it eliminates tick populations before contact.
Yes. New Hampshire consistently ranks #3 nationally for Lyme disease incidence. CDC data shows tick bite-related ER visits in 2026 are at their highest level since 2017. The Seacoast region — with its wooded lots, stone walls, Great Bay estuary, and high deer density — sits at the center of the highest-risk zone in the state.
Early Lyme disease symptoms typically appear 3–30 days after a tick bite: a bullseye-shaped expanding rash at the bite site in 70–80% of cases, fever, chills, headache, fatigue, muscle and joint aches. Roughly 20–30% of cases show no rash. If you find an attached tick or develop these symptoms, see a doctor promptly — early antibiotic treatment is highly effective.
Blacklegged ticks typically need to be attached for 36–48 hours to transmit Lyme disease bacteria. This is why daily tick checks after outdoor activity are critical — finding and removing a tick within 24 hours dramatically reduces transmission risk. The tick must be removed properly: fine-tipped tweezers, firm upward pull, clean the bite site with rubbing alcohol.
Yes. TickShield uses EPA-registered formulas selected specifically for properties with dogs and cats. Treated areas are safe for pets to re-enter in under 4 hours after the application dries. Dogs are particularly vulnerable to Lyme disease — canine Lyme can cause kidney failure if untreated. Year-round flea/tick prevention for dogs plus professional yard treatment provides the best protection.
Lyme disease in New Hampshire is transmitted almost exclusively by the blacklegged tick (Ixodes scapularis), also called the deer tick. The American dog tick (the large brown tick many people recognize) does not carry Lyme but can transmit Rocky Mountain Spotted Fever. If you're seeing large brown ticks, that's the dog tick — concerning, but not for Lyme. Small, dark ticks are deer ticks — the Lyme vector.
476,000 Americans contract Lyme every year. New Hampshire ranks #3 nationally. The Seacoast region has some of the highest tick pressure in the state. A free yard inspection shows you exactly where your exposure risk is — and what professional treatment eliminates it. No obligation, no pressure. Just clarity.
We'll walk your property, identify tick hotspots and Lyme risk zones, and give you a clear quote for professional protection. Serving Dover, Portsmouth, Rochester & Somersworth NH.
A free yard inspection takes 20 minutes. You'll know exactly where your tick risk is and what it costs to eliminate it — no obligation, no pressure, no sales call. Serving Dover, Portsmouth, Rochester, and Somersworth NH.