This data set contains an inventory of corner reflectors installed in Northern Alaska, USA, as part of the NASA SnowEx 2023 field campaign (Vuyovich et al., 2024). Corner Reflectors (CRs) are objects with known response characteristics used to calibrate or study radar returns from airborne and spaceborne imagery. The SnowEx Alaska CRs were installed in situ between October 2022 and October 2023 for the following SnowEx Alaska intensive observation periods (IOPs): October 2022, March 2023, and October 2023. During the SnowEx Alaska field campaigns, CRs served two primary purposes. First, “engineering corner reflectors” were deployed to calibrate radar imagery and ensure precise backscatter measurements. Second, an array of “science corner reflectors” was installed to investigate the interaction between radar and forests. CRs were deployed at 32 locations across two SnowEx Alaska study areas: 9 in the Arctic tundra at the Upper Kuparuk Toolik (UKT) study area and 23 in the boreal forest at the Bonanza Creek Experimental Forest (BCEF) study area.