Fordham Tri-State Tick Risk

Tick Index for July 23, 2026

7 out of 10: HIGH RISK

Tick Index

Tick Fact of the Week

The Asian longhorned tick, first reported on a NJ sheep in 2017, has actually been around in the US since at least 2010 (deer in West Virginia), and since 2014 in NY (Staten Island).  From small introductions, it has spread to at least 19 states in just over a decade.

About the Fordham Tick Index

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 

Regional Map for Tick Index including: Manhattan, Bronx, Queens, Brooklyn, Staten Island, Nassau, Suffolk, Hudson, Essex