Are There Lone Star Ticks in Colorado?
Lone Star Ticks are not established in Colorado. These ticks require warm, humid conditions found in the southeastern and south-central United States. Colorado's elevation and climate are unsuitable for this species. Colorado has its own native tick species. If you live in Colorado, Lone Star Ticks are not a concern for you.
By Tim, founder of Easy Street Markets. I maintain the wildlife database and verify every animal and source myself. Updated July 22, 2026.
Lone Star Tick · Jeff Clark CC BY
Lone Star Tick · Katja Schulz CC BY
Lone Star Tick · Public domain CC0
- 1
- species recorded
- 7
- GBIF records
- June, March, April
- peak months
Lone Star Ticks are rare in Colorado, so you might also want:
Real sighting data, source iNaturalist
Only 8 verified observations on iNaturalist of lone star tick have been logged in Colorado, which fits how rare they are in the state. That low number is itself the most honest answer to whether you are likely to see one here.
Lone Star Ticks are not established in Colorado. These ticks require warm, humid conditions found in the southeastern and south-central United States. Colorado's elevation and climate are unsuitable for this species. Colorado has its own native tick species. If you live in Colorado, Lone Star Ticks are not a concern for you.
Are they in Colorado?
Lone Star Ticks are not established in Colorado and are not found in the state in any significant numbers. These ticks require warm, humid conditions to survive, and Colorado's high elevation, low humidity, and cold winters are unsuitable for this tick species. Lone Star Ticks are native to the southeastern and south-central United States, ranging from Texas east to Maine, but only in humid lowland and coastal regions. Colorado, with its Rocky Mountain elevation and semi-arid climate, is simply outside the range of this tick species. The nearest populations of Lone Star Ticks to Colorado are found hundreds of miles to the southeast, in states like Arkansas, Louisiana, and Texas. This is genuinely good news for Colorado residents. You can learn more about where these ticks actually live by visitingLone Star Ticks in Colorado, though your risk of encountering them there is zero. Colorado has its own native tick species adapted to mountain and semi-arid conditions.
How dangerous is it?
While Lone Star Ticks are not a concern in Colorado, understanding their danger level is useful if you travel to the southeastern or south-central United States. These ticks can carry serious illnesses including ehrlichiosis, Rocky Mountain spotted fever, and Lone Star fever. A tick bite can also trigger alpha-gal allergy, which makes some people unable to digest red meat. Despite these risks, actual bites are uncommon for most people, and illnesses from tick-borne diseases are treatable with prompt medical attention. Deaths from tick-borne illnesses are very rare in healthy adults who receive medical care. The good news is that prevention is simple and effective. If you travel to the Southeast or South for vacation or work, knowing about these ticks before you go allows you to take sensible precautions. Most travelers never encounter these ticks because they use basic awareness and clothing protection. Understanding the tick's danger without panic is the key to safe travel in tick-prone regions.
How to recognize one
Lone Star Ticks are relatively easy to identify if you encounter them while traveling in the southeastern or south-central United States. Adult females are distinctive because they have a single white or cream-colored spot on their dark reddish-brown backs, giving the species its name. Adults are about the size of a sesame seed, roughly one-quarter inch. Males lack the bright spot and appear darker overall. Nymphs are much smaller, about the size of a poppy seed, and are harder to spot on skin. All stages have eight legs and a rounded body shape. They hide in tall grass, brush, leaf litter, and vegetation where they wait for animals or people to brush past. If you travel to southeastern states and spend time outdoors in wooded or brushy areas, knowing what to look for helps you stay alert. Check your skin, clothes, and pets after being outdoors to catch any ticks before they bite. Many commonColorado wildlifeticks look quite different from this eastern species.
What to do if you are bitten or stung
If you are bitten by a Lone Star Tick while traveling in the southeastern United States, stay calm. The bite itself is usually painless, so you might not notice it immediately. If you find a tick attached to your skin, remove it carefully by grasping it close to the skin with fine-tipped tweezers and pulling straight outward. Do not twist or jerk. Once removed, wash the area with soap and water. Do not crush the tick with your fingers. Keep the tick in a container if possible, as it can be tested for disease if you develop symptoms later. After a tick bite, watch for symptoms such as fever, chills, headache, muscle aches, or rash appearing within one to two weeks. This is general information, not medical advice; if you are bitten, call Poison Control at 1-800-222-1222, or 911 if symptoms are severe. Do not attempt to treat the bite yourself with home remedies. Seek professional medical evaluation if any symptoms develop while traveling or after you return home to Colorado.
How to prevent encounters
If you are planning to travel to the southeastern or south-central United States, taking tick prevention precautions is smart. When hiking or walking in wooded or brushy areas, wear long pants tucked into socks or boots, and wear closed-toe shoes. Light-colored clothing makes ticks easier to spot before they bite. Apply an insect repellent containing DEET to exposed skin and clothing, following label directions. After being outdoors, remove your clothes and put them directly in the washing machine. Inspect your entire body carefully for ticks, paying special attention to warm, moist areas like armpits, groin, and hairline. Check your pets for ticks after outdoor time as well. These steps significantly reduce your risk of a tick bite. When you return to Colorado, your risk of encountering Lone Star Ticks drops back to zero. For additional resources about safety while traveling, seeour wildlife guidesfor more detailed information. Being prepared before you travel makes outdoor adventures in warm, humid states safer and more enjoyable.
Where in the southeastern United States and when
Lone Star Ticks are found throughout the southeastern and south-central United States, from Texas east to Maine, concentrated in warm, humid regions at lower elevations. They are established in states like Louisiana, Texas, Arkansas, Mississippi, Alabama, Georgia, Florida, South Carolina, North Carolina, Virginia, and all states in between. They thrive in mixed hardwood forests, pine stands, grasslands, and brushy habitats typical of the humid Southeast. These ticks are active from late spring through early fall in their established range, with peak activity from May through August when temperatures and humidity are highest. In Colorado, obviously, this is not a concern. If you travel to the Southeast for vacation or work, early summer and fall are the most likely times to encounter these ticks. Understanding when and where they are active helps youplan outdoor activities safely in wildliferegions you visit. Seasonal timing helps you know when to be most cautious.
Harmless lookalikes
In Colorado, the tick species you might encounter are completely different from Lone Star Ticks. Colorado's native tick species include the Rocky Mountain Wood Tick, American Dog Tick, and various species adapted to mountain and semi-arid environments. These mountain and plains tick species have different life cycles, habitats, and medical significance compared to Lone Star Ticks. If you find a tick in Colorado, it is almost certainly a mountain or plains-adapted species rather than a Lone Star Tick. The white-spotted appearance of a Lone Star Tick would be highly unusual in Colorado, so if you see that marking, you would know immediately that this is not a species native to your state. If you travel southeast and encounter ticks there, the good news is that most ticks you find, even unfamiliar species, will not bite if you remove them promptly and carefully. Formore on Lone Star Ticks in Colorado, reference materials are available. Learning about different tick species is interesting but not essential for Colorado residents.
Frequently Asked Questions
Q: Are Lone Star Ticks found in Colorado? A: No, they are not established in Colorado. These ticks require warm, humid conditions and cannot survive Colorado's elevation and climate. Your risk of encountering one at home is zero. Q: What if I travel to the southeastern states? A: Lone Star Ticks do occur in the Southeast. If you visit those regions, use basic prevention like checking yourself after outdoor time and wearing protective clothing. Bites are uncommon even when ticks are present. Q: Should I worry about bringing a tick back to Colorado? A: A single tick brought back accidentally will not establish a population in Colorado's climate and elevation. However, good practice is to check luggage and clothing anyway. You have nothing to worry about regarding Colorado's risk from this species. Q: What ticks do I need to watch for in Colorado? A: Colorado has its own native tick species adapted to mountain environments. These are less common than southeastern ticks but may occur in certain areas. For information aboutColorado wildlife guide, local resources provide details on native species.
Plan your trip
Best time to see lone star tick in Colorado: June, March, April
See the month-by-month sighting calendar.
Plan your lone star tick sighting in Colorado
7 verified lone star tick records have been logged in Colorado, most recently in 2025. See the GBIF records.
Where to look in Colorado
- Bent's Old Fort National Historic Site · Wildlife Watching, Birdwatching · Find hotels
- Black Canyon Of The Gunnison National Park · Wildlife Watching, Birdwatching · Find hotels
- Colorado National Monument · Wildlife Watching · Find hotels
- Curecanti National Recreation Area · Wildlife Watching, Birdwatching · Find hotels
- Dinosaur National Monument · Wildlife Watching, Birdwatching · Find hotels
- Great Sand Dunes National Park & Preserve · Wildlife Watching, Birdwatching · Find hotels
Frequently asked questions
Are they in Colorado?+
Lone Star Ticks are not established in Colorado and are not found in the state in any significant numbers. These ticks require warm, humid conditions to survive, and Colorado's high elevation, low humidity, and cold winters are unsuitable for this tick species. Lone Star Ticks are native to the southeastern and south-central United States, ranging from Texas east to Maine, but only in humid lowland and coastal regions. Colorado, with its Rocky Mountain elevation and semi-arid climate, is simply outside the range of this tick species. The nearest populations of Lone Star Ticks to Colorado are found hundreds of miles to the southeast, in states like Arkansas, Louisiana, and Texas. This is genuinely good news for Colorado residents. You can learn more about where these ticks actually live by visitingLone Star Ticks in Colorado, though your risk of encountering them there is zero. Colorado has its own native tick species adapted to mountain and semi-arid conditions.
How dangerous is it?+
While Lone Star Ticks are not a concern in Colorado, understanding their danger level is useful if you travel to the southeastern or south-central United States. These ticks can carry serious illnesses including ehrlichiosis, Rocky Mountain spotted fever, and Lone Star fever. A tick bite can also trigger alpha-gal allergy, which makes some people unable to digest red meat. Despite these risks, actual bites are uncommon for most people, and illnesses from tick-borne diseases are treatable with prompt medical attention. Deaths from tick-borne illnesses are very rare in healthy adults who receive medical care. The good news is that prevention is simple and effective. If you travel to the Southeast or South for vacation or work, knowing about these ticks before you go allows you to take sensible precautions. Most travelers never encounter these ticks because they use basic awareness and clothing protection. Understanding the tick's danger without panic is the key to safe travel in tick-prone regions.
More places to see lone star tick
More wildlife in Colorado