Can Ticks Survive a Southern Summer? What the Research Shows

Ticks are well known for surviving harsh northern winters, but their ability to persist in hot southern climates is less often discussed. Research suggests that environmental conditions, particularly humidity, play a key role in tick survival.

This raises an important question: can ticks survive the heat of a southern summer? Findings indicate that survival depends less on temperature alone and more on moisture in the environment.

In laboratory studies, hybrid Ixodes scapularis ticks did not survive as well under southern conditions when humidity was low.

“Four-month-old larvae resulting from a cross between Wisconsin males and South Carolina females died faster under southern than under northern conditions in the lab,” according to Ginsberg.

The Role of Humidity

Humidity had a significant impact on survival. Ticks died more quickly under southern conditions when relative humidity was low (75%).

However, survival improved at moderate (85%) and high (95%) humidity levels.

Ticks may adapt to southern environments by remaining in leaf litter, where moisture levels are higher and temperatures are more stable.

Implications for Tick Exposure in the South

These findings suggest that ticks can survive southern climates when conditions are favorable, particularly in shaded, humid environments.

The study did not evaluate actual bite risk during southern summers, but the ability of ticks to persist in these environments suggests that exposure may still occur.

Tick activity may extend beyond expected seasonal patterns, especially in regions with higher humidity.

Clinical Perspective

Ticks are not limited to northern climates. Environmental factors such as humidity and habitat play a critical role in their survival.

Patients may benefit from awareness of tick bite prevention, review of Lyme disease symptoms, and understanding that tick exposure may occur in a wider range of environments than expected.

For more on this topic, see: Don’t let your guard down on questing ticks in the South.