Fordham Tri-State Tick Risk

Tick Index for November 21 through November 23, 2025

2 out of 10: LOW RISK

The Fordham Tick Index is an estimate of the risk of being bitten by a nymphal or adult deer tick in the tri-state area, encompassing southern New York, Connecticut, and northern New Jersey. This index measures risk relative to other times of year.  

Both the nymph and adult tick are active at this time of year, although the smaller nymph is responsible for many more cases of Lyme disease. For more information about preventing tick bites, controlling ticks, Lyme disease and other illnesses ticks carry, visit the Centers for Disease Control and Prevention.

The Fordham Tick Index is provided as a weekly public service by Fordham University and is based on both current and historical data from the Louis Calder Center, Fordham's Biological Field Station in Westchester County, N.Y. It is an estimate only. Actual risk may vary geographically. Therefore, always take precautions to prevent tick bites when outdoors.

Tick Risk Map 

Tick Fact of the Week

The first known example of a mutualistic relationship between two mammal species, neither of which is a primate, involves banded mongooses that feast on ticks and other parasites infesting warthogs. Filmed interactions in Queen Elizabeth National Park in Uganda show a warthog kneeling while a pack of mongooses climb over it, grooming the host and eating ticks pulled from it. A win-win for everyone but the ticks.

For further information, contact Thomas Daniels.