‘Ōpe‘ape‘a (Hawaiian hoary bats; Lasiurus semotus) were surveyed at 23 sites on Hawaiʻi Island from 33 to 2,341 m elevation from May 2018 to August 2021. Of the 23 sites, 8 were established as fixed survey sites for sampling at repeated intervals from January 2019 through January 2021. We surveyed each fixed site at least once per four-month period (January–April, May–August, September–December), with a survey comprising one to three netting events. Additional opportunistic surveys were conducted at alternate sites or on alternate dates. We captured 138 unique bats (37 female, 101 male) and recaptured 10 bats over 224 mist-netting events. Of the total 148 captured bats we affixed 131 with radio transmitters and attempted to relocate 127 (38 female; 89 male; 120 adult; 7 juvenile) bats in trees or forest stands used for day roosts on subsequent days of tracking. Of 91 bats (32 female; 59 male) relocated, males retained transmitters longer than females with a mean low estimate of 9 ± 6 days for males and 6 ± 4 days for females (time from capture to the last day a signal was confirmed). This data release consists of three tabular datasets: (1) Hawaiʻi Island ʻōpeʻapeʻa mist netting effort, 2018–2021, (2) Hawai‘i Island ʻōpeʻapeʻa captures, 2018–2021, and (3) Hawaiʻi Island ʻōpeʻapeʻa transmitter retention, 2018-2021.