Southeastern Pennsylvania, including areas such as Philadelphia’s suburbs, Bucks County, Montgomery County, Chester County, and Delaware County provides ideal conditions for tick activity. Wooded landscapes, rolling terrain, creek corridors, and suburban development combine with humid summers and mild shoulder seasons to support tick populations from early spring through late fall.
Ticks are frequently encountered by residents, pet owners, hikers, and outdoor workers, especially in yards, parks, trails, and properties bordering wooded or brush-heavy areas.
The most common and medically significant tick species in Southeastern Pennsylvania.
Key traits:
Prefers wooded areas, leaf litter, and shaded yard edges
Nymphs are extremely small and most active in spring and early summer
Adult ticks peak again in fall
Known to transmit Lyme disease, anaplasmosis, and babesiosis
Frequently found in areas with deer and small mammal activity
Widespread throughout Southeastern Pennsylvania, particularly in open and grassy areas.
Key traits:
Most active from late spring through summer
Found in grassy fields, park edges, trails, and roadside vegetation
Primary vector for Rocky Mountain spotted fever in Pennsylvania
Larger size makes it easier to detect on people and pets
An increasingly common tick species in Southeastern Pennsylvania.
Key traits:
Adult females display a white “lone star” marking
Aggressive host-seeking behavior compared to other ticks
Expanding northward and becoming more established in the region
Known to transmit ehrlichiosis
Associated with alpha-gal syndrome, a red meat sensitivity linked to tick bites
Residents are more likely to encounter ticks in:
Wooded neighborhoods and forest edges
Parks, hiking trails, and conservation areas
Overgrown yards and unmanaged property lines
Areas near creeks, rivers, and wetlands
Properties with frequent deer or rodent activity
Dog parks and outdoor recreation spaces
Early Spring: Nymph-stage deer ticks become active as temperatures rise
Late Spring–Summer: American dog ticks are more common in open grassy areas
Fall: Adult deer ticks and lone star ticks are active again
Winter: Activity slows, but ticks can survive beneath leaf litter and snow cover
