American dog tick bites in Colorado
Colorado has 49 verified american dog tick records in the GBIF biodiversity database — ranking it 38th nationally. Sightings concentrate in April to July. The bite itself appears within a day and lasts about a week.
| Verified records | 49 |
|---|---|
| Peak sightings | April to July |
| State bite season | May to September |
| Active | daytime |
| Habitat | grassy fields, trail edges and scrub east of the Rockies, plus parts of the Pacific coast |
| Bite appears | within a day |
Identifying it in Colorado
Larger than a blacklegged tick and patterned with off-white marbling on the shield, the American dog tick is the one most often found already engorged on a scalp or a dog. The bite is usually painless, so discovery is by touch rather than by symptom.
Locally, the species most often confused with it are honey bee sting, paper wasp sting, bald-faced hornet sting — all of which are also recorded in Colorado.
Seek medical care if
- fever with a rash starting on wrists and ankles — treat as urgent
- severe headache or muscle pain days after a bite
- unsteady walking or weakness while a tick is still attached
What else it could be in Colorado
These are recorded in Colorado too and are the ones most often confused with it here. The differences below are the ones that actually separate them.
| American dog tick bite | Lone star tick bite | |
|---|---|---|
| Pattern | single | single, sometimes dozens at once when larval "seed ticks" swarm |
| Where on body | scalp, neck, legs | legs, waist, groin |
| Appears | within a day | within hours of attachment |
| Records here | 49 | 7 |
Season in Colorado specifically
Records in Colorado concentrate in April to July, which is what local sighting data shows rather than a national average — seasonality shifts substantially with latitude. The general bite season in Colorado runs May to September.
Because grassy fields, trail edges and scrub east of the Rockies, plus parts of the Pacific coast, exposure in Colorado tends to be concentrated in specific places rather than spread evenly — which is why a bite history ("where were you in the 24 hours before?") narrows the answer faster than the appearance of the mark.
Care
- remove promptly with fine-tipped tweezers
- wash and note the date
- seek care early if fever develops — Rocky Mountain spotted fever is treatable but time-critical
Avoiding them in Colorado
- permethrin on clothing and boots
- keep to mown paths
- daily tick checks in season
Questions
When are american dog ticks active in Colorado?
Colorado records peak in April to July. The general bite season in Colorado runs May to September.
Are they common in Colorado?
Colorado accounts for 49 verified records in GBIF, ranking it 38th among states for this species. Records reflect reporting effort as well as abundance.
What does the bite look like?
a firm red bump, sometimes with a small crust where the mouthparts were, red. Single.
Get a photo assessment in the app
Everything above is free to read. The app adds what a page cannot: point your camera at the bite and get an assessment of the most likely cause, a severity read, and a day-by-day care plan — including the specific signs that mean you should be seen.
iPhone and iPad. Free to download.