This dataset contains UV-Vis-NIR reflectance spectra of icy simulant samples, collected under ultra-high vacuum (10^-6 mbar) and cryogenic (20K) conditions. An ASD FieldSpec spectrometer measured reflectance spectra and a broadband Xenon Arc lamp was used as the incident white light source. Reflectance spectra were collected off a 99 percent Spectralon reflectance standard prior to each measurement.