Earliest and Latest Snowfalls in Yellowstone National Park History

This is a list of the earliest and latest times in the year when snow was recorded in Yellowstone National Park, Wyoming. It is based on NOAA data from the years 1904–2024.
What's the Earliest it has Snowed in Yellowstone National Park?
The earliest in the season it has snowed in Yellowstone National Park, Wyoming is September 6 which happened in 2000.
What's the Latest it has Snowed in Yellowstone National Park?
The latest in the season it has snowed in Yellowstone National Park, Wyoming is June 23 which has happened twice, most recently in 1993.

Earliest Snowfalls

Date Year Snowfall
September 6 2000 0.5 inches
September 8 2020 6.5 inches
September 9 2020 1.0 inches
September 11 1988 1.5 inches
September 12 1993 0.5 inches
September 12 1985 1.0 inches
September 13 2016 3.5 inches
September 14 1991 1.5 inches
September 15 1941 2.0 inches
September 17 1996 0.3 inches
September 17 1944 9.0 inches
September 18 1982 3.0 inches
September 18 1978 6.0 inches
September 19 2017 0.5 inches
September 19 1996 1.0 inches
September 20 2017 1.0 inches
September 20 1986 0.5 inches
September 21 2017 0.5 inches
September 21 1985 0.3 inches
September 22 2017 2.0 inches
September 22 2000 4.5 inches
September 22 1945 11.0 inches

Latest Snowfalls

Date Year Snowfall
June 23 1993 0.3 inches
June 23 1906 0.4 inches
June 22 2019 1.5 inches
June 21 2019 0.5 inches
June 21 1916 5.5 inches
June 20 2019 0.5 inches
June 19 1979 1.0 inches
June 18 2014 0.6 inches
June 17 1993 0.3 inches
June 15 1981 1.0 inches
June 15 1943 1.5 inches
June 14 1981 2.5 inches
June 13 2001 3.0 inches
June 13 1993 1.3 inches
June 13 1990 5.0 inches
June 13 1981 1.0 inches
June 9 2019 0.5 inches
June 9 1986 2.0 inches
June 9 1982 0.3 inches
June 8 2019 2.0 inches
June 8 1994 1.0 inches
June 8 1984 0.3 inches
June 8 1982 2.3 inches