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Palos Heights, Illinois, is a suburban village south of Chicago in Cook County, featuring tree-lined neighborhoods, wooded buffers, greenbelts, retention ponds, and drainage infrastructure. These lush, water-holding environments—combined with the region’s humid continental climate—create ideal conditions for mosquitoes and ticks.
Palos Heights’s wooded residential buffers, retention basins, stormwater corridors, and park-adjacent yards support heightened mosquito and tick activity during warm months.
Residents face mosquito‑borne threats such as West Nile virus. In summer 2025, West Nile virus specimens were detected in 17 Cook County suburbs—including Palos Heights—prompting state public health alerts. Tick‑borne illnesses—namely Lyme disease, Rocky Mountain spotted fever, Ehrlichiosis, tularemia, and alpha‑gal syndrome—are increasingly reported, especially in wooded and brushy areas. The Illinois Department of Public Health continues to emphasize its “Fight the Bite” campaign during tick season.
Recommended preventive steps include:
Combination of homeowner diligence, professional pest management, and Cook County health guidance helps Palos Heights remain safe and enjoyable outdoors year‑round.
The weather in Palos Heights reflects a humid continental climate—hot, humid summers with thunderstorms and cold winters. In July 2024, Cook County reported 46% of mosquito pools testing positive for West Nile virus—indicating high transmission risk. While no human cases have yet been identified in Palos Heights or local suburbs in 2025, health officials urge ongoing vigilance following environmental detections. Tick season is active April through September—particularly spring and early fall—when woodland and brush areas are prime habitat.
Identification: Small, dark brown to black mosquito with white scales on the thorax and legs.
Habitat: Breeds in natural containers like tree holes and artificial containers such as tires.
Behavior: Daytime biter; females are aggressive and primarily feed on mammals.
Health Risks: Primary vector of La Crosse encephalitis virus.
Identification: Medium-sized, dark mosquito with bronze-colored scales and distinct white markings on the legs and thorax.
Habitat: Prefers artificial containers, rock pools, and tree holes.
Behavior: Active during the day; feeds on mammals and birds.
Health Risks: Potential vector for West Nile virus and La Crosse encephalitis.
Identification: Medium-sized with a brown body and white bands on the abdomen and legs.
Habitat: Breeds in temporary floodwaters, such as rain pools and marshes.
Behavior: Nocturnal; females are persistent biters of mammals.
Health Risks: Potential vector for West Nile virus.
Identification: Small to medium-sized, light brown mosquito with unbanded legs and a blunt abdomen.
Habitat: Breeds in stagnant water sources like ditches, storm drains, and containers.
Behavior: Active during dusk and dawn; females prefer avian hosts but will bite humans.
Health Risks: Primary vector of West Nile virus.
