Today’s Tick Risk in Delaware – Real-Time Forecast & Activity Map
Check your ZIP code for local tick activity, real-time risk levels, and prevention insights.
Built from CDC and NOAA data
Surveillance Insights
- Annual Lyme Cases
- ~600+ confirmed cases
- high incidence rate per capita
- Based on CDC surveillance data
- Long-Term Trend
- Increasing prevalence of Lone Star tick
- Based on CDC surveillance data
- High Risk Zones
- New Castle, Sussex, Kent, Cape Henlopen State Park, Great Cypress Swamp, Bombay Hook National Wildlife Refuge
Current Situation in Delaware
Delaware may be the second-smallest state, but it carries a disproportionately heavy burden of tick-borne disease. The entire state is considered a high-risk zone for Lyme disease, and it lies on the frontier of the northward expansion for southern tick species. The tick forecast for Delaware is influenced heavily by its humid, maritime climate and low-lying geography. Residents face a "double threat": the established blacklegged tick population transmits Lyme and other pathogens, while the aggressive Lone Star tick is becoming increasingly common, bringing risks of Ehrlichiosis and red meat allergy. The state's flat, accessible terrain encourages outdoor recreation, increasing the frequency of human-tick encounters.
Snapshot of the current tick situation in Delaware, based on regional surveillance data and seasonal activity patterns.
- Risk Level
- Moderate to High
- Peak Activity
- May - July
- Dominant Vector
- Deer Tick (Ixodes scapularis)
Where Ticks Hide in Delaware
Delaware's ecology is a mix of coastal plain forests, agricultural fields, and extensive wetlands. This combination creates a humid, shelter-rich environment where ticks thrive. The state's numerous state parks, such as Cape Henlopen, Trap Pond, and Killens Pond, are popular destinations that unfortunately harbor high tick densities. The transition zones between farm fields and drainage ditches or woodlots are prime hunting grounds for ticks. Suburban expansion in New Castle and Sussex counties has brought residential properties into direct contact with these tick-rich environments. The high humidity levels throughout the peninsula help ticks survive longer during dry spells than they would in inland areas.
Seasonal Activity Pattern
Delaware's mild, mid-Atlantic climate allows for an exceptionally long active season for ticks. The nymphal deer tick season peaks in late spring and early summer, but the real differentiator is the extended activity of adult ticks and other species. Adult deer ticks are active throughout the winter months whenever temperatures are above freezing—which is frequent in Delaware. Lone Star ticks are active from early spring through late summer and are known to be aggressive biters. The risk of tick encounter is essentially year-round, with only the coldest, snowiest weeks of winter offering a brief respite.
Check Your Local Tick Risk
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Local Vector Analysis
Understanding which ticks are active in Delaware helps you identify threats and take appropriate precautions.
Deer Tick / Blacklegged Tick
Ixodes scapularis
Appearance: Dark reddish-brown body with black shield on back. Adults are 3-5mm.
Peak Season: Adults: Oct-May | Nymphs: May-Aug
Habitat: Deciduous forests, shady moist areas, and leaf litter. Loves the boundary between lawns and woods.
Diseases: Lyme Disease, Anaplasmosis, Babesiosis, Powassan Virus, B. miyamotoi
Lone Star Tick
Amblyomma americanum
Appearance: Distinct white dot or "lone star" on female's back. Reddish-brown body.
Peak Season: Active from early Spring through late Fall
Habitat: Woodlands with dense undergrowth and around animal resting areas.
Diseases: Ehrlichiosis, Alpha-gal Syndrome, STARI, Heartland Virus, Bourbon Virus
Note: Aggressive hunter. Actively pursues hosts.
American Dog Tick
Dermacentor variabilis
Appearance: Brown with white/grey mottling. Ornate white patterns on shield.
Peak Season: Spring and Summer
Habitat: Grassy fields, walkways, and trails. More tolerant of dry conditions than Deer Ticks.
Diseases: Rocky Mountain Spotted Fever, Tularemia
Lyme Disease
Vector: Deer tick (Ixodes scapularis)
Lyme Disease
Lyme disease is a bacterial infection transmitted by deer ticks. If caught early, it's highly treatable with antibiotics. Left untreated, it can cause serious complications affecting joints, heart, and nervous system.
Early Warning Signs
- Erythema migrans (EM) rash - appears in 70-80% of cases
- Bullseye rash (circular red rash with clear center)
- Rash appears 3-30 days after bite
- Fever and chills
Progression & Symptoms
- Severe headaches and neck stiffness
- Facial palsy (loss of muscle tone on one or both sides of face)
- Arthritis with severe joint pain, especially knees
Prevention Strategies
The best way to avoid tick-borne diseases is to prevent tick bites in the first place. These strategies work together to create multiple layers of protection.
Permethrin-Treated Clothing
Permethrin is an insecticide that kills ticks on contact. When applied to clothing, it remains effective through multiple washes.
Daily Tick Checks
Since disease transmission typically requires 24-48 hours of attachment, finding and removing ticks quickly dramatically reduces infection risk.
Landscaping Defense
Creating a tick-hostile environment in your yard reduces the chance ticks will be waiting when you step outside.
Shower Within 2 Hours
Showering after outdoor activity gives you a chance to wash off ticks before they bite.
Tick Bite Protocol
Acting quickly and correctly is your best defense against infection.Follow these 6 critical steps.
Don't Panic
Most tick bites do not transmit disease, especially if removed quickly.
- Infection rates vary by region (20-50%)
- Transmission usually takes 24-48 hours
- Stay calm and use proper technique
Gather Tools
Use fine-tipped tweezers. Avoid fingers or chemicals.
- Fine-tipped tweezers are best
- Rubbing alcohol for cleaning
- Small container to save the tick
Grasp & Pull
Grasp close to skin and pull upward with steady pressure.
- Grab mouthparts near skin (not body)
- Pull straight up—don't twist
- Maintain steady, even pressure
Clean Area
Disinfect the bite site and your hands thoroughly.
- Wash with soap and water
- Apply rubbing alcohol
- Wash hands well
Save Tick
Keep the tick in a sealed container for potential testing.
- Seal in bag or container
- Label with date and location
- Bring to doctor if symptoms appear
Monitor (30 Days)
Watch for rash or flu-like symptoms for a month.
- Check for expanding rash daily
- Watch for fever or fatigue
- Seek care if you feel unwell
When does tick season end in Delaware?
Tick activity winds down after the first hard freeze, which in Delaware typically arrives around Oct 28. See the local first-frost window and city-by-city freeze dates.
Delaware first frost datesAlso worried about mosquitoes in Delaware?
West Nile virus, EEE, and the local mosquito season vary by state. Check your Delaware mosquito risk profile.
View Delaware mosquito forecastStay Safe in Delaware
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