This website was created by tick researchers at the University of Wisconsin-Madison to provide members of the public with evidence-based information and guidance on ticks and tickborne diseases in Wisconsin.
Wisconsin Ticks
Tick-borne Diseases
The Tick App
Tick Bite Prevention
The Tick AppTick Updates
March 6, 2025: It's early but days are warming. Whenever temperatures at ground level get above 40-42, adult blacklegged (deer) ticks will start to be active. These ticks transmit Lyme disease so if you are clearing brush or hiking/walking in forest or forested edges, be sure to do your tick checks.
May 31, 2024: Nymphs have been active for most of May. Adults are also still out but numbers are declining. The Lyme spirochete is usually present in about 20% of nymphs (1 out of 5) and around half of adults. Be sure to remove ticks quickly to reduce the risk of transmission. June into the first 2 weeks in July is usually our peak season for nymphs so stay vigilant.
May is National Lyme Awareness Month. Use personal prevention (tick checks, repellents) to help protect yourself, your pets and your family.
April 9, 2024: Adult deer ticks are very active in April. With the warm weather, it's especially important to start doing regular tick checks. Remember that ticks may be on your head but also may attach anywhere from your feet to your neck.
In the News
ABC News 18 Eau Claire
UW-Madison researchers survey ticks in Eau Claire; also identify lone star tick
Milwaukee NPR interview
Reporting on the warm winter and what we can expect from ticks.
- More News