Lone Star ticks by state
CDC lists Lone Star ticks as established in 1,139 counties across 33 states and D.C., and has reports from 635 more counties. Find your state for its county map, peak season and what to do.
Or search your ZIP code, town or county
All 51, A to Z
- AlabamaFound here42 of 67 counties established · Peak March – October
- AlaskaRarely reportedNo CDC records in any of its 29 boroughs and census areas
- ArizonaRarely reportedNo CDC records in any of its 15 counties
- ArkansasAlpha-gal hotspot73 of 75 counties established · Peak April – September
- CaliforniaRarely reportedNo CDC records in any of its 58 counties
- ColoradoRarely reportedNone established; reported in 4 of 64
- ConnecticutSpreading3 of 8 counties established · Peak April – August
- DelawareAlpha-gal hotspot2 of 3 counties established · Peak April – September
- District of ColumbiaFound hereEstablished · Peak April – September
- FloridaFound here48 of 67 counties established · Active year-round, peak April – August
- GeorgiaFound here60 of 159 counties established · Peak March – October
- HawaiiRarely reportedNo CDC records in any of its 5 counties
- IdahoRarely reportedNo CDC records in any of its 44 counties
- IllinoisAlpha-gal hotspot68 of 102 counties established · Peak April – July
- IndianaAlpha-gal hotspot49 of 92 counties established · Peak April – September
- IowaFound here28 of 99 counties established · Peak May – June
- KansasAlpha-gal hotspot32 of 105 counties established · Peak March – October
- KentuckyAlpha-gal hotspot86 of 120 counties established · Peak March – September
- LouisianaFound here19 of 64 parishes established · Peak March – October
- MaineSpreadingNone established; reported in 12 of 16 · Peak April – August
- MarylandAlpha-gal hotspot18 of 24 counties and cities established · Peak April – September
- MassachusettsSpreading1 of 14 counties established · Peak April – August
- MichiganSpreading5 of 83 counties established · Peak April – September
- MinnesotaRarely reportedNone established; reported in 3 of 87
- MississippiAlpha-gal hotspot58 of 82 counties established · Peak March – October
- MissouriAlpha-gal hotspot63 of 115 counties and cities established · Peak April – September
- MontanaRarely reportedNo CDC records in any of its 56 counties
- NebraskaFound here27 of 93 counties established · Peak April – September
- NevadaRarely reportedNo CDC records in any of its 17 counties and cities
- New HampshireSpreading1 of 10 counties established · Peak April – August
- New JerseyFound here14 of 21 counties established · Peak April – September
- New MexicoRarely reportedNone established; reported in 1 of 33
- New YorkFound here19 of 62 counties established · Peak April – September
- North CarolinaAlpha-gal hotspot48 of 100 counties established · Peak April – September
- North DakotaRarely reportedNo CDC records in any of its 53 counties
- OhioFound here19 of 88 counties established · Peak April – September
- OklahomaAlpha-gal hotspot69 of 77 counties established · Peak March – September
- OregonRarely reportedNo CDC records in any of its 36 counties
- PennsylvaniaFound here8 of 67 counties established · Peak April – August
- Rhode IslandSpreading2 of 5 counties established · Peak April – August
- South CarolinaFound here25 of 46 counties established · Peak March – October
- South DakotaSpreading4 of 66 counties established · Peak April – September
- TennesseeAlpha-gal hotspot45 of 95 counties established · Peak April – September
- TexasFound here118 of 254 counties established · Peak March – August
- UtahRarely reportedNo CDC records in any of its 29 counties
- VermontRarely reportedNone established; reported in 4 of 14
- VirginiaAlpha-gal hotspot70 of 133 counties and cities established · Peak April – September
- WashingtonRarely reportedNo CDC records in any of its 39 counties
- West VirginiaFound here13 of 55 counties established · Peak May – September
- WisconsinSpreading1 of 72 counties established · Peak April – September
- WyomingRarely reportedNone established; reported in 1 of 23
County counts: CDC county data, 2025 (opens in a new tab). The whole table, state by state, is on where Lone Star ticks live.
What the levels mean
- Rarely reported
- Few or no Lone Star tick reports in public data. Other ticks still live here.
- Spreading
- Reports are increasing at the edge of the Lone Star tick's range.
- Found here
- Inside the Lone Star tick's documented range.
- Alpha-gal hotspot
- Inside the range, and among the states where CDC found the highest rates of suspected alpha-gal cases.
Levels are our summary of CDC tick-surveillance and alpha-gal case data plus peer-reviewed research, reviewed June 2026. They describe where ticks are reported, not your personal medical risk. Where public data is limited, we say so rather than overstate it. How we rate places, peak months for every state and every source.