Earliest and Latest Snowfalls in Boulder History

This is a list of the earliest and latest times in the year when snow was recorded in Boulder, Colorado. It is based on NOAA data from the years 1893–2024.

What's the Earliest it has Snowed in Boulder?

The earliest in the season it has snowed in Boulder, Colorado is September 8 which happened in 2020.

What's the Latest it has Snowed in Boulder?

The latest in the season it has snowed in Boulder, Colorado is June 12 which happened in 1947.

Earliest Snowfalls

Date	Year	Snowfall
September 8	2020	1.7 inches
September 9	2020	4.0 inches
September 10	1898	0.5 inches
September 11	1898	0.5 inches
September 12	2014	0.5 inches
September 12	1974	2.7 inches
September 13	1993	1.0 inches
September 14	1903	1.0 inches
September 17	1993	0.3 inches
September 17	1971	18.0 inches
September 18	1993	0.1 inches
September 18	1971	3.0 inches
September 20	1995	0.3 inches
September 20	1965	2.3 inches
September 21	1995	8.3 inches
September 21	1994	0.4 inches
September 21	1965	1.2 inches
September 21	1951	1.5 inches
September 22	1946	1.0 inches
September 23	2000	1.4 inches
September 23	1965	0.2 inches

Latest Snowfalls

Date	Year	Snowfall
June 12	1947	1.0 inches
June 3	1951	0.7 inches
June 2	1951	1.5 inches
May 29	1947	3.0 inches
May 28	1947	2.0 inches
May 25	1950	8.7 inches
May 24	2002	1.1 inches
May 24	1995	0.8 inches
May 22	1930	5.5 inches
May 21	2022	4.5 inches
May 21	2019	5.1 inches
May 21	2001	3.6 inches
May 21	1945	0.5 inches
May 21	1931	7.2 inches
May 21	1910	2.0 inches
May 20	2022	3.8 inches
May 20	2001	0.2 inches
May 20	1931	11.8 inches
May 20	1915	6.0 inches
May 19	2017	0.8 inches
May 19	1960	1.5 inches
May 19	1915	2.5 inches