Earliest and Latest Days at or Below 32° F in Boulder

This is a list of the earliest and latest days in a winter season where the low temperature fell to at least 32 °F in Boulder, Colorado history. It is based on NOAA data from the years 1893–2024.

Earliest freezing temperature in Boulder?

The earliest in a winter season that Boulder, Colorado has recorded a low temperature of 32 °F or below is September 8 which happened in 2020.

Latest freezing temperature in Boulder?

The latest in a winter season that Boulder, Colorado has recorded a low temperature of 32 °F or below is June 29 which happened in 1935.

Earliest Days ≤ 32 °F

Date	Year	Temperature
September 8	2020	32 °F
September 9	2020	30 °F
September 9	1941	32 °F
September 9	1929	32 °F
September 12	2014	32 °F
September 12	1974	31 °F
September 13	2014	32 °F
September 13	1993	31 °F
September 14	1993	28 °F
September 14	1912	32 °F
September 15	1912	32 °F
September 15	1903	30 °F
September 16	1912	30 °F
September 16	1903	32 °F
September 17	1971	30 °F
September 17	1965	27 °F
September 18	1971	30 °F
September 19	1971	22 °F
September 19	1942	32 °F
September 20	1995	32 °F
September 20	1983	29 °F
September 20	1934	32 °F
September 20	1912	32 °F

Latest Days ≤ 32 °F

Date	Year	Temperature
June 29	1935	28 °F
June 28	1935	30 °F
June 26	1935	31 °F
June 25	1935	29 °F
June 21	1935	24 °F
June 20	1935	20 °F
June 19	1935	32 °F
June 18	1935	28 °F
June 16	1935	22 °F
June 14	1935	25 °F
June 13	1947	32 °F
June 13	1935	26 °F
June 12	1947	32 °F
June 12	1935	32 °F
June 7	1917	32 °F
June 3	1951	32 °F
June 2	1951	30 °F
June 2	1919	32 °F
June 2	1907	30 °F
May 29	1947	30 °F