Fordham Tri-State Tick Risk

Tick Index for October 23, 2026

5 out of 10: MODERATE

Tick Index

Tick Fact of the Week

The estimated geographic distribution of the Western Blacklegged tick (I. pacificus) by Bishopp andTrembley in 1945 is similar to that presented in 2022 by the Centers for Disease Control and Prevention (CDC&P). There is no clear evidence of range expansion for this species to date. But that can change with a warming climate. 

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