Fordham Tri-State Tick Risk

Tick Index for Week of 7/11/25

9 out of 10: HIGH 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

Following up on last week’s tick fact, the red meat allergy that may develop from bites by Lone Star ticks in the U.S. results from transmission of a sugar molecule found in all mammals, except humans and Old World monkeys. Unsure if baboons can also develop an allergy to hamburgers.

For further information, contact Thomas Daniels.