Are There Ticks in Colorado?
Yes, ticks are present throughout Colorado, particularly in forested areas and foothills. Wood ticks are the primary species, found across the state's varied elevations. Tick activity is seasonal, peaking in spring and early summer when temperatures warm. Colorado's varied elevations mean tick presence and seasonality differ significantly between low and high areas.
By Tim, founder of Easy Street Markets. I maintain the wildlife database and verify every animal and source myself. Updated July 22, 2026.
American Dog Tick · Nova Patch CC BY-SA
American Dog Tick · Matthew Lindsey CC BY
Asian Longhorned Tick · Zachary Dankowicz CC BY
- 189
- GBIF records
Yes, ticks are in Colorado. Next you'll want:
Verified species, source iNaturalist
2 types of ticks recorded in Colorado
2 tick species have a verified observation record in Colorado, each with at least 10 confirmed sightings. The full list, ranked by how often each is recorded, is below.
- No openly licensed photo yet1
- No openly licensed photo yet2
Plus 5 more recorded only rarely (fewer than 10 verified sightings). Counts from verified iNaturalist observations.
Yes, ticks are present throughout Colorado, particularly in forested areas and foothills. Wood ticks are the primary species, found across the state's varied elevations. Tick activity is seasonal, peaking in spring and early summer when temperatures warm. Colorado's varied elevations mean tick presence and seasonality differ significantly between low and high areas.
Are they in Colorado?
Yes, ticks are established throughout Colorado, particularly in forested areas and foothills. Colorado's diverse elevations support tick populations in suitable habitats. Wood ticks are the most common species in Colorado, found in forests, foothill scrubland, and grasslands statewide. American dog ticks are also present throughout Colorado in lower-elevation grasslands and brushy areas. Ixodes ticks are present in Colorado but are less abundant than in eastern states. Tick presence is highest in the forested foothills and mountain regions, particularly around Denver and Boulder foothills, the Front Range, and throughout the state's numerous national forests. Lower-elevation and drier areas have fewer ticks due to climatic conditions.Tick in Coloradoare found statewide in suitable habitats, with populations heaviest in the forested regions. If you hike in Colorado's mountains and foothills, especially in spring and early summer, tick precautions are advisable. Elevation significantly affects when ticks are active, with higher elevations having shorter tick seasons.
How dangerous is it?
Tick bites in Colorado can transmit Rocky Mountain spotted fever from wood ticks, and Lyme disease from Ixodes ticks, though disease transmission is less common in Colorado than in eastern states. The actual risk from a single tick bite is low for most people, especially when the tick is removed promptly. Fever, rash, joint pain, or muscle aches after a tick bite warrant medical attention, but these conditions are treatable with antibiotics when diagnosed early. Serious complications from tick-borne illness are uncommon in Colorado, particularly with prompt removal and medical care. Most tick bites cause only mild local irritation and redness around the attachment site. Children and elderly individuals should take extra precautions. Colorado's altitude and climate mean lower overall tick abundance compared to eastern states. The key to safety is early removal of ticks and medical attention if symptoms develop. Most Colorado residents who encounter ticks and remove them promptly experience no lasting effects.
How to recognize one
Ticks are small arachnids with eight legs and flat, oval bodies when unfed. Unfed ticks are often the size of a sesame seed or smaller, while engorged ticks swell to the size of a raisin. Wood ticks, the most common species in Colorado, are brown or mottled in color with lighter markings on their backs. American dog ticks are reddish-brown to dark brown with lighter markings. Ixodes ticks are smaller and darker, ranging from brown to nearly black. Ticks hide in tall grass, brush, leaf litter, and on vegetation in forested and grassy areas. They wait on leaves and branches for a passing animal or person to brush against them. You are unlikely to feel a tick when it first attaches.Colorado wildlifehabitats, from the Front Range to the Rocky Mountains to the western plateau forests, all harbor ticks in suitable microhabitats. After hiking in tick-prone areas, carefully inspect your entire body, paying special attention to hidden areas like behind your ears, under your arms, in your hair, and between your toes.
What to do if you are bitten or stung
Stay calm if you find a tick on your skin. Remove it as soon as possible using tweezers or a tick removal tool. Grasp the tick close to its mouth parts and pull straight out with steady, gentle pressure. Do not twist, squeeze, or jerk the tick, as this can cause the mouth parts to break off and remain embedded. After removal, clean the bite area with soap and water or rubbing alcohol. You can dispose of the tick by placing it in a sealed bag, flushing it, or crushing it. Some people preserve ticks for testing if illness develops later. Watch the bite area over the next few days for signs of infection or a spreading rash. 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 use nail polish, petroleum jelly, or heat to remove a tick. Seek medical care if you develop fever, rash, joint pain, or muscle aches in the weeks after a bite.
How to prevent encounters
The best strategy is to prevent tick encounters in the first place. When hiking in Colorado's forested or mountain areas, stay on established trails and avoid walking through tall grass, brush, and thick vegetation. Wear long pants tucked into your socks and long sleeves when possible, especially during peak tick season from March through June. Light-colored clothing makes ticks easier to spot before they attach. Apply insect repellent containing DEET to exposed skin before heading outdoors. Permethrin applied to clothing, gear, and boots is particularly effective at repelling and killing ticks on contact. After spending time outdoors, inspect your entire body carefully, paying special attention to hidden areas. Shower and wash your clothes in hot water after outdoor activities. Clear brush, dead wood, and leaf litter from around your home.Our wildlife guidesinclude additional prevention strategies for managing outdoor wildlife risks. Trim vegetation away from structures and remove or elevate woodpiles. Keep grasses mowed short in areas near your home.
Where in Colorado and when
Ticks in Colorado are found primarily in forested regions, foothills, and grasslands supporting wildlife populations. The Front Range foothills near Denver and Boulder have established tick populations. The Rocky Mountain forests throughout Colorado, including areas around Rocky Mountain National Park and various national forests, support wood tick populations. Lower-elevation grasslands and scrubland throughout eastern Colorado have American dog ticks. Tick season in Colorado depends significantly on elevation. At lower elevations, ticks are active from roughly April through June, with some activity continuing into fall. Higher elevations have shorter tick seasons, with peak activity occurring in late May through July as temperatures warm at altitude.Wildlife in Coloradoexists in diverse ecosystems where tick presence varies by elevation and habitat. Winter at most elevations kills off most ticks, though some survive at lower elevations. Spring snowmelt and warming temperatures trigger tick emergence and activity.
Harmless lookalikes
Ticks are distinctive enough that they are rarely confused with other creatures in Colorado. Small mites, lice, or other arthropods might occasionally cause concern, but they differ significantly from ticks. Mites are generally much smaller than ticks and have different body structures. Seed ticks, which are unfed baby ticks, might look similar to other tiny arthropods, but they have the characteristic eight-legged tick body shape. Most small parasites or bites are far more likely to be harmless spider bites, chiggers, or other insects rather than ticks. Colorado's cool climate and drier conditions mean fewer parasitic arthropods overall compared to warmer, wetter regions. If you are unsure about an insect, you can photograph it or place it in a container for a doctor or local extension office to identify.More on Tick in Coloradoincludes detailed identification resources to help distinguish real ticks from harmless lookalikes. The good news is that Colorado's lower tick abundance means your actual risk of encountering one is lower than in eastern states.
Frequently Asked Questions
Are ticks deadly? Tick bites themselves are rarely fatal, though ticks can transmit serious diseases. Deaths from tick-borne illness are uncommon in the US and even less common in Colorado due to lower disease prevalence. How common are tick bites in Colorado? More common in forested and foothill regions than in high mountains or plains due to habitat and elevation. Most hikers in foothills will encounter at least one tick per season. What attracts ticks to an area? Ticks are attracted to wildlife, particularly deer and elk, and to areas with brush, grass, and moisture. Removing brush and maintaining clear ground around your home reduces tick presence. What should I do if I see one? Remove it immediately using tweezers, pulling straight out gently and completely. Clean the area with soap and water, and watch for signs of rash or fever over the next two weeks.Colorado wildlife guideprovides additional resources for managing wildlife concerns. If you develop symptoms after a tick bite, seek medical attention.
Plan your tick sighting in Colorado
189 verified tick records have been logged in Colorado, most recently in 2026. 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?+
Yes, ticks are established throughout Colorado, particularly in forested areas and foothills. Colorado's diverse elevations support tick populations in suitable habitats. Wood ticks are the most common species in Colorado, found in forests, foothill scrubland, and grasslands statewide. American dog ticks are also present throughout Colorado in lower-elevation grasslands and brushy areas. Ixodes ticks are present in Colorado but are less abundant than in eastern states. Tick presence is highest in the forested foothills and mountain regions, particularly around Denver and Boulder foothills, the Front Range, and throughout the state's numerous national forests. Lower-elevation and drier areas have fewer ticks due to climatic conditions.Tick in Coloradoare found statewide in suitable habitats, with populations heaviest in the forested regions. If you hike in Colorado's mountains and foothills, especially in spring and early summer, tick precautions are advisable. Elevation significantly affects when ticks are active, with higher elevations having shorter tick seasons.
How dangerous is it?+
Tick bites in Colorado can transmit Rocky Mountain spotted fever from wood ticks, and Lyme disease from Ixodes ticks, though disease transmission is less common in Colorado than in eastern states. The actual risk from a single tick bite is low for most people, especially when the tick is removed promptly. Fever, rash, joint pain, or muscle aches after a tick bite warrant medical attention, but these conditions are treatable with antibiotics when diagnosed early. Serious complications from tick-borne illness are uncommon in Colorado, particularly with prompt removal and medical care. Most tick bites cause only mild local irritation and redness around the attachment site. Children and elderly individuals should take extra precautions. Colorado's altitude and climate mean lower overall tick abundance compared to eastern states. The key to safety is early removal of ticks and medical attention if symptoms develop. Most Colorado residents who encounter ticks and remove them promptly experience no lasting effects.
More wildlife in Colorado