Earliest and Latest Days of 80° F in Boulder

This is a list of the earliest and latest days in the year with a high temperature of at least 80 °F in Boulder, Colorado history. It is based on NOAA data from the years 1893–2024.

Also see:

Earliest 80 degree day in Boulder?

The earliest in the year that Boulder, Colorado had a high temperature of at least 80 °F is March 16 which happened in 2015.

Latest 80 degree day in Boulder?

The latest in the year that Boulder, Colorado had a high temperature of at least 80 °F is November 16 which happened in 2016.

Earliest Days ≥ 80 °F

Date	Year	Temperature
March 16	2015	80 °F
March 17	1910	90 °F
March 18	2017	80 °F
March 20	1997	80 °F
March 21	1910	83 °F
March 22	1910	80 °F
March 31	2012	81 °F
April 1	2012	81 °F
April 2	2011	82 °F
April 4	2021	80 °F
April 5	1991	80 °F
April 6	1991	80 °F
April 6	1959	80 °F
April 6	1930	80 °F
April 7	1988	86 °F
April 7	1930	81 °F
April 8	1930	83 °F
April 10	1960	80 °F
April 10	1907	80 °F
April 11	2023	84 °F
April 11	1982	81 °F
April 11	1894	81 °F

Latest Days ≥ 80 °F

Date	Year	Temperature
November 16	2016	80 °F
October 31	1950	83 °F
October 30	1933	80 °F
October 29	2003	81 °F
October 29	1968	83 °F
October 29	1950	83 °F
October 29	1933	80 °F
October 28	2016	80 °F
October 28	1933	80 °F
October 27	2016	82 °F
October 26	1966	81 °F
October 25	2017	85 °F
October 25	1959	80 °F
October 24	2014	83 °F
October 24	2011	80 °F
October 24	1952	81 °F
October 23	2003	86 °F
October 23	1983	80 °F
October 23	1973	82 °F
October 23	1950	81 °F