Earliest and Latest Snowfalls in Flagstaff History

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

What's the Earliest it has Snowed in Flagstaff?

The earliest in the season it has snowed in Flagstaff, Arizona is September 19 which happened in 1965.

What's the Latest it has Snowed in Flagstaff?

The latest in the season it has snowed in Flagstaff, Arizona is May 29 which has happened twice, most recently in 1990.

Earliest Snowfalls

Date	Year	Snowfall
September 19	1965	2.0 inches
September 24	1986	0.9 inches
September 25	1906	1.0 inches
September 29	1905	2.0 inches
October 1	1959	0.3 inches
October 3	1986	0.2 inches
October 7	2018	0.7 inches
October 8	1961	5.0 inches
October 8	1939	1.0 inches
October 9	1961	2.0 inches
October 10	2013	0.6 inches
October 11	2021	0.2 inches
October 11	1986	0.4 inches
October 12	2021	0.7 inches
October 14	1994	8.2 inches
October 15	1980	4.5 inches
October 15	1960	0.2 inches
October 16	2018	0.8 inches
October 16	1971	5.9 inches
October 16	1965	2.0 inches

Latest Snowfalls

Date	Year	Snowfall
May 29	1990	0.3 inches
May 29	1971	2.5 inches
May 28	1990	1.1 inches
May 28	1971	1.2 inches
May 28	1962	2.0 inches
May 27	1962	0.8 inches
May 24	1965	6.6 inches
May 23	2019	0.6 inches
May 23	2008	4.4 inches
May 22	2008	0.6 inches
May 21	1975	4.7 inches
May 20	2019	0.9 inches
May 20	1975	0.4 inches
May 19	2011	0.1 inches
May 18	2017	1.0 inches
May 18	2011	1.6 inches
May 17	1962	0.4 inches
May 16	1953	0.5 inches
May 16	1951	1.0 inches
May 16	1898	1.0 inches