Are ticks a problem in Contra Costa County?

There have been 14 tick reports near Contra Costa County, CA, with 0 bites and 14 sightings. The most common species reported is the Unidentified. Check the Tick Map for the latest 2026 tick activity.

What kind of ticks are in Contra Costa County?

The most commonly reported tick species in Contra Costa County include Unidentified, Deer Tick. Each species carries different disease risks — see our species guide for identification help.

Tick Map

View MapMap

Ticks in Contra Costa County, CA

14 tick reports from the Contra Costa County, CA area.

View on full interactive map

Total Reports

Sightings

Bites

Species Found in Contra Costa County

Unidentified13 (93%)

Deer Tick1 (7%)

Risk: High — carries Lyme disease

Tick Safety in Contra Costa County

Ticks are active in Contra Costa County, CA and surrounding areas. The most commonly reported species is the Unidentified, making up 93% of reports.

✓Wear light-colored clothing when walking in wooded areas or tall grass
✓Use EPA-registered tick repellent (DEET, picaridin, or IR3535)
✓Do a full-body tick check after being outdoors — especially behind ears, hairline, and waistband
✓Shower within 2 hours of coming inside
✓If bitten, remove the tick with fine-tipped tweezers and monitor for symptoms for 30 days