Information on ticks and tick-borne diseases

New Hampshire Blacklegged Tick Report, October 16, 2016

Blacklegged tick is our most common tick in New Hampshire.  It is the species that spreads the vast majority of cases of tick-borne disease in New Hampshire. It appears that the drought caused high mortality of blacklegged tick nymphs in parts of New Hampshire this summer. Those nymphs that survived are the adults that are active now and will continue activity next spring, if they do not find a host to bite this fall.

Normally adult activity begins about October 1st, and this October field sampling shows very few blacklegged ticks in Rockingham County, eastern Hillsborough County, eastern half of Merrimack County, and the southern half of Strafford County. Blacklegged tick numbers seem a bit lower than usual in Cheshire and Sullivan Counties, and almost normal in the Lakes region. I have not sampled in the far North.

I anticipate this lowered risk of encountering blacklegged ticks in much of our state will extend through the spring of 2017. For now, the adults will be in host-seeking mode (it’s called questing) when air temperatures are above 40F and the leaf litter is not too dry. When snow covers the ground, that will end blacklegged tick activity until it melts and the temperature rises to 40F. Typically, I see a lot of blacklegged tick activity in October and November.

More information on this and other ticks, plus the diseases they spread, and how to protect yourself are on this page. - Dr. Alan Eaton, Entomologist, UNH Cooperative Extension

New Hampshire Tick-Borne Disease Prevention Plan

This plan was unveiled (if that’s the correct word…) April 14th, 2015.  The lead author is Dr. Abigail Matthewson, of the NH Department of Health and Human Services, but several of us in various state agencies participated in the planning, assembling information, and writing. It covers all human tick-borne diseases in New Hampshire, describes their symptoms & etiology, and goes over the various options to prevent becoming a victim.  There are dozens of links to useful information, for people who really want a really thorough coverage of the subject.  To learn more about Lyme and other tick borne diseases, click here.  - Dr. Alan Eaton, Entomologist, UNH Cooperative Extension


Blacklegged Ticks in New Hampshire, Updated Map - December 1, 2015


This map is the result of 26 years of my active and passive surveillance on blacklegged tick (BLT) in New Hampshire. When I began, there were just three published records of this species in New Hampshire. This map compiles over 900 of my records, through December 1, 2015. Click here to read more detail, see a larger version of the map, or print the map.

Read the Biology and Management of Ticks in NH publication.


The NH Division of Health & Human Services has information and maps on Lyme disease and blacklegged tick.

Learn more



Ticks can transmit several human diseases, and New Hampshire is home to many species of ticks.  Learn what ticks look like, how they live, the diseases they spread, how to manage tick problems, and how to protect yourself from tick-borne diseases. 

Learn more about ticks











Read the Tick Rap lyrics and comments by Alan