Illicit cannabis cultivation on public lands in Northern California is widespread and poses a significant threat to wildlife due to habitat modification, water diversions, heavy pesticide use, and refuse dumping. Though many wildlife species are known to be impacted by this activity, to date, no assessment of bat use of public‑land cannabis cultivation sites (PLCCS) has been conducted. This study used passive acoustic monitors to compare bat assemblages at seven PLCCS and paired controls in similar undisturbed habitats, from September through November, for four consecutive nights per site in 2024. We quantified nightly bat passes, foraging activity, and acoustic diversity. The three most frequently detected species included California myotis (Myotis californicus), little brown bat (Myotis lucifugus), and silver-haired bat (Lasionycteris noctivagans). Preliminary analysis suggests higher foraging activity at PLCCS, while we found no difference in species richness. We hypothesize that this is due to habitat modifications within PLCCS that increase forest edges and canopy gaps, thereby providing more foraging habitat for species adapted to feeding in open environments. This study provides the first documentation of bats utilizing PLCCS. Such usage increases risk of exposure to pesticide-contaminated prey, potentially causing sublethal effects on thermoregulation, immune function, and overall population fitness.