This data set contains raw airborne microwave observations from the Goddard Space Flight Center SWESARR (Snow Water Equivalent Synthetic Aperture Radar and Radiometer) instrument collected during the SnowEx 2020 field campaign at Grand Mesa, Colorado. Data collection occurred over 10 microsecond intervals along a ~5 minute flight line using three frequencies (9.65, 13, and 17 GHz) in two polarization modes (VV and VH). All of the data files were acquired over a 3-day flight campaign in November 2019 and a 3-day flight campaign in February 2020. Available data include measured complex backscatter in in-phase and quadrature binary format, along with supporting metadata.