The Black-legged Tick, or deer tick, is the primary vector of Lyme disease in the eastern United States, as well as anaplasmosis, babesiosis, and Powassan virus. Adults are tiny — nymphs the size of a poppy seed — making them easy to overlook. The tick must be attached for 36–48 hours to transmit Lyme disease, so prompt removal after outdoor activity is essential.
Best time to see a Black-legged Tick
The best time to see a Black-legged Tick is February–June, when about 62% of U.S. sightings happen, based on 11,674 research-grade iNaturalist observations.
Not certain it is a Black-legged Tick? What bug is this? walks through what to check first and the lookalikes that catch people out.
Recent Black-legged Tick sightings near you
Live, research-grade observations from iNaturalist. Allow location to center the map on you.
Spotted a Black-legged Tick?
Point Huck at any plant, bird, or animal and know for sure - plus a live map of where it is being spotted near you.