Ixodes scapularis

In Indiana, nymphs are most active during spring and summer and adults are most active during the fall and early spring. However, adult ticks may be active any time winter temperatures are above freezing. The blacklegged tick life cycle consists of four stages (egg, larva, nymph, and adult) and usually takes two years to complete. At each stage, the tick must have a blood meal in order to molt and develop to the next stage. Both nymphs and adults can feed on humans and are capable of transmitting disease.

The life cycle of the blacklegged tick (Ixodes scapularis). Graphic: Centers for Disease Control and Prevention.

Seasonal Activity of the blacklegged tick. Graphic: Midwest Center of Excellence.

• Lyme disease
• Anaplasmosis
• Babesiosis
• Powassan virus

The best way to prevent diseases associated with blacklegged ticks is to avoid tick bites. Please see our tick prevention page for more information.

For more information about blacklegged ticks, please visit the Midwest Center of Excellence in Vector-Borne Disease.