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Tick Surveillance, Water Year 2023-2024

A forest trail surrounded by trees with sunlight filtering through the canopy.
Oak woodlands with leaf litter are an ideal place to collect Ixodes pacificus nymphs.

Tick Collections from parks, 2023-2024 Season (November 2023 through June 2024)

During June, Laboratory staff continued collections for Western black-legged tick (Ixodes pacificus) nymphs. Peak nymphal tick season typically comes to an end in June.


Parks and neighborhoods surveyed in June include areas of the Portola Valley Ranch neighborhood in Portola Valley, Pulgas Ridge Open Space Preserve in San Carlos/Redwood City and Hidden Canyon Park in Belmont.

Additionally, a preschool in Half Moon Bay was surveyed for ticks. No Western black-legged ticks were collected at the school, but a few Dermacentor ticks were found.  Dermacentor ticks are not a vector of Lyme disease.

 Tick Collections from parks and neighborhoods, 2023-2023 Season (through June 2024)

Park/NeighborhoodNearest City/TownNumber of Ix. pacificus adultsNumber of Ix. pacificus nymphs
Garrett ParkRedwood City3 
Sign Hill ParkSouth San Francisco0
Twin Pines ParkBelmont0
Hillside ParkDaly City0
Hillsborough southHillsborough114
Mussel RockDaly City1
Windy Hill Open Space PreservePortola Valley443101
Burleigh H. Murray RanchHalf Moon Bay126
Phleger EstateWoodside84
San Pedro Valley ParkPacifica10030
Hidden CanyonBelmont5574
Wunderlich ParkWoodside 70
Edgewood ParkRedwood City 187
Huddart ParkWoodside 74
Thornewood Open Space PreserveWoodside 144
Coal Mine Ridge Portola Valley 78
Los Trancos Open Space PreservePortola Valley 94
Coal Creek Open Space PreservePortola Valley 64
Big Canyon ParkSan Carlos 67
Skyline Ridge Open Space PreserveLa Honda 68
Portola Valley RanchPortola Valley 62
Pulgas Ridge Open Space PreserveRedwood City 71

Page last reviewed July 3, 2024

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