This dataset contains daily fractional snow covered area (fSCA) at 30-m spatial resolution from August 1, 2015 - May 15, 2020 (five winters) for the National Elk Refuge in Wyoming, USA. The following summary statistics are also included: date of snow accumulation, date of snow melt, number of days in year with snow on ground, and percentage of "winter days" in year with snow on ground. The SNOWARP algorithm was used to produce these data (Berman et. al., 2018; see full citation below), in which dynamic time warping fuses together MODIS MOD10A1 with Landsat level-3 fSCA, resulting in daily 30-m fSCA estimates. All dates correspond to winter day of year (WDOY), which runs between August 1 - July 31 each season and has values between 1-365. Date of snow accumulation and date of snow melt provide an indication of when snow begins to persist and when it melts. Details are provided below. Number of days in year with snow on ground is the number of days, out of 365, with snow on ground between August 1 and July 31st each winter. The percentage of winter days in year with snow on ground is the percentage of days with snow each winter between date of snow accumulation and date of snow melt. Please note that winter 2018-2019 was only processed until May 31, 2019 (WDOY 304), and winter 2019-2020 was only processed until May 15, 2020 (WDOY 288), and therefore the only summary stat available for these winters is date of snow accumulation.