Ticks in Indiana
Ticks are active in Indiana whenever the ground is not frozen, led by the Lyme-carrying deer tick. TickZone scores all 566 Indiana towns every morning, so risk stays local: pick your town for today's number, a 7-day outlook, and what's driving it.
Tick season in Indiana
Tick season in Indiana runs whenever the ground is not frozen, roughly March through November, with two peaks. Nymph deer ticks, the poppy-seed-sized stage that causes most Lyme cases, peak from late May through July. Adult deer ticks make a second push in October and November, and on any winter day above about 40 F they can quest again. American dog ticks are busiest from April through July.
| Life stage | J | F | M | A | M | J | J | A | S | O | N | D |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Deer tick nymphs | ||||||||||||
| Deer tick adults | ||||||||||||
| American dog tick | ||||||||||||
| Lone star tick |
Those are averages, and any single week can run hotter or colder than the calendar suggests. The daily score on every town page folds the season, the weather, and local habitat into one number each morning, so it is the safer way to time yard work, hikes, and pet prevention.
Highest-risk towns in Indiana (2026)
Indiana's highest-risk towns are spread across several counties, led by Marion (1 CDC-reported Lyme cases per 100k). The top 10 towns run 82 to 98 percent forest, ranked at peak season so the list stays stable.
- 1North Crows Nest Marion CountyModerate at peak
- 2Rocky Ripple Marion CountyModerate at peak
- 3Williams Creek Marion CountyModerate at peak
- 4Woodlawn Heights Madison CountyModerate at peak
- 5River Forest Madison CountyModerate at peak
- 6Michiana Shores LaPorte CountyModerate at peak
- 7Pottawattamie Park LaPorte CountyModerate at peak
- 8Bethany Morgan CountyModerate at peak
- 9Indian Village St. Joseph CountyModerate at peak
- 10Crows Nest Marion CountyModerate at peak
All Indiana towns, by county
Adams County · 4 towns
Allen County · 7 towns
Bartholomew County · 6 towns
Benton County · 6 towns
Blackford County · 3 towns
Boone County · 7 towns
Brown County · 1 towns
Carroll County · 5 towns
Cass County · 5 towns
Clark County · 6 towns · 4/100k Lyme
Clay County · 7 towns
Clinton County · 6 towns
Crawford County · 5 towns
Daviess County · 7 towns
Dearborn County · 7 towns
Decatur County · 5 towns
DeKalb County · 8 towns
Delaware County · 7 towns
Dubois County · 5 towns
Elkhart County · 7 towns · 4/100k Lyme
Fayette County · 1 towns
Floyd County · 3 towns
Fountain County · 8 towns
Franklin County · 5 towns
Fulton County · 4 towns
Gibson County · 10 towns
Grant County · 10 towns
Greene County · 7 towns
Hamilton County · 8 towns · 1/100k Lyme
Hancock County · 8 towns
Harrison County · 9 towns
Hendricks County · 11 towns
Henry County · 15 towns
Howard County · 3 towns
Huntington County · 6 towns
Jackson County · 4 towns
Jasper County · 4 towns · 15/100k Lyme
Jay County · 6 towns
Jefferson County · 4 towns
Jennings County · 2 towns
Johnson County · 8 towns
Knox County · 9 towns
Kosciusko County · 13 towns · 8/100k Lyme
LaGrange County · 3 towns
Lake County · 19 towns · 3/100k Lyme
LaPorte County · 11 towns · 5/100k Lyme
Lawrence County · 3 towns
Madison County · 15 towns
Marion County · 15 towns · 1/100k Lyme
Marshall County · 6 towns · 14/100k Lyme
Martin County · 3 towns
Miami County · 6 towns
Monroe County · 3 towns
Montgomery County · 11 towns
Morgan County · 7 towns
Newton County · 5 towns
Noble County · 7 towns
Ohio County · 1 towns
Orange County · 4 towns
Owen County · 2 towns
Parke County · 6 towns
Perry County · 3 towns
Pike County · 3 towns
Porter County · 11 towns · 7/100k Lyme
Posey County · 5 towns
Pulaski County · 4 towns
Putnam County · 6 towns
Randolph County · 9 towns
Ripley County · 7 towns
Rush County · 3 towns
Scott County · 2 towns
Shelby County · 3 towns
Spencer County · 7 towns
St. Joseph County · 9 towns · 7/100k Lyme
Starke County · 3 towns
Steuben County · 6 towns
Sullivan County · 7 towns
Switzerland County · 2 towns
Tippecanoe County · 6 towns · 3/100k Lyme
Tipton County · 4 towns
Union County · 2 towns
Vanderburgh County · 2 towns
Vermillion County · 7 towns
Vigo County · 4 towns · 5/100k Lyme
Wabash County · 5 towns
Warren County · 4 towns
Warrick County · 6 towns
Washington County · 6 towns
Wayne County · 14 towns
Wells County · 6 towns
White County · 7 towns
Whitley County · 4 towns
Indiana tick questions
- Are there ticks in Indiana?
- Yes. Indiana has ticks in every county, led by the deer tick (blacklegged tick) that spreads Lyme disease, along with the American dog tick and the lone star tick. They are active whenever the ground is not frozen, and today 352 of the state's 566 towns are at moderate or high tick risk on TickZone's daily score.
- What types of ticks live in Indiana?
- Indiana has the deer tick (blacklegged tick), which carries Lyme disease; the American dog tick; and the lone star tick, which is reported in the state and causes alpha-gal syndrome. See the Indiana tick identification chart for photos and how to tell them apart.
- When does tick season start and end in Indiana?
- In Indiana, ticks are active whenever the ground is not frozen, roughly March through November. Nymph deer ticks peak in June and July and cause most Lyme cases, and adult ticks have a second peak in the fall. On any winter day above freezing, adult ticks can still bite.
- When is flea and tick season?
- Flea and tick season generally runs from early spring through late fall, peaking in the warm summer months. In Indiana, start prevention for pets and people in March and keep it up through November, since ticks can bite on any mild day.
- Which tick carries Lyme disease in Indiana?
- The deer tick, also called the blacklegged tick, is the tick that spreads Lyme disease in Indiana. The American dog tick and lone star tick do not carry Lyme.