This data release provides datasets supporting research on landslides triggered by a series of storms in the San Francisco Bay Area, California, that occurred between December 25, 2022, through January 19, 2023. During this period, eight atmospheric river storms delivered intense and prolonged rainfall across the region, leading to significant hydrological responses and widespread landsliding. Statewide, over 700 landslides were initially reported, with the total count likely exceeding 10,000. This release includes detailed observations from three landslide-prone monitoring sites in urbanized areas of the San Francisco Bay Area, capturing high-resolution time series data on rainfall, soil moisture, and subsurface pore water pressure. These datasets can be used for analyzing the subsurface hydrologic conditions preceding and during landslide events, thereby providing insight into storm-induced landslide triggers and informing future landslide prediction models. The data also support ongoing efforts to improve early warning systems for rainfall-induced landslides in California and other vulnerable regions. The data package includes the following files: 1. CSV Files: Time-series data capturing rain, soil moisture and piezometer measurements for each monitoring site. These files track key variables such as soil volumetric water content and pore water pressure, essential for understanding the hydrologic triggers of landslides. 2. PDF: Geotechnical Properties of Sites: This document presents detailed results from soil classification and hydromechanical testing conducted at each site. The data provide the physical properties of the soil, such as its composition and behavior under stress, which influence landslide susceptibility. 3. PDF: Site Images and Cross-Sections: This file contains a photograph and cross-sectional diagram of each site, offering visual context and structural details for the monitoring locations. These diagrams help illustrate the subsurface geological characteristics relevant to landslide risks. 4. PDF: Location Maps: This document includes a map showing the precise geographic location of each monitoring site within the San Francisco Bay Area, providing context for the collected data regarding regional landslide hazards. 5. CSV Files: Landslide location data for landslides mapped to have occurred during the December 25, 2022, to January 19, 2023, storm sequence near the BALT1 (East Bay), BALT2 (Marin County), and BALT3 (San Francisco Peninsula) monitoring sites. Each dataset includes a unique landslide identifier and the corresponding easting and northing referenced to the North American Datum of 1983 (NAD83) (EPSG:26910) and projected to Universal Transverse Mercator (UTM) Zone 10 North coordinates. These locations represent general landslide locations and should not be misconstrued as the precise headscarp location.