Are ticks a problem in San Mateo County?

There have been 21 tick reports near San Mateo County, CA, with 0 bites and 21 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 San Mateo County?

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

Tick Map

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Ticks in San Mateo County, CA

21 tick reports from the San Mateo County, CA area.

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Total Reports

Sightings

Bites

Species Found in San Mateo County

Unidentified20 (95%)

Deer Tick1 (5%)

Risk: High — carries Lyme disease

Tick Safety in San Mateo County

Ticks are active in San Mateo County, CA and surrounding areas. The most commonly reported species is the Unidentified, making up 95% 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