Earliest and Latest Days of 90° F in Castle Rock

This is a list of the earliest and latest days in the year with a high temperature of at least 90 °F in Castle Rock, Colorado history. It is based on NOAA data from the years 1893–2024.

Also see:

Earliest 90 degree day in Castle Rock?

The earliest in the year that Castle Rock, Colorado had a high temperature of at least 90 °F is April 27 which happened in 1981.

Latest 90 degree day in Castle Rock?

The latest in the year that Castle Rock, Colorado had a high temperature of at least 90 °F is September 28 which happened in 2021.

Earliest Days ≥ 90 °F

Date	Year	Temperature
April 27	1981	91 °F
May 17	1996	91 °F
May 17	1927	91 °F
May 19	2020	93 °F
May 19	1996	90 °F
May 20	2020	94 °F
May 20	1996	90 °F
May 21	2020	90 °F
May 23	2012	90 °F
May 23	1989	90 °F
May 27	1895	90 °F
May 30	2020	91 °F
May 30	2003	94 °F
May 31	2002	90 °F
May 31	2000	90 °F
June 1	2020	90 °F
June 1	2002	90 °F
June 1	2000	90 °F
June 2	2020	92 °F
June 2	2002	94 °F

Latest Days ≥ 90 °F

Date	Year	Temperature
September 28	2021	91 °F
September 27	2021	91 °F
September 27	2020	91 °F
September 26	2021	90 °F
September 26	2020	93 °F
September 25	2020	91 °F
September 24	1902	90 °F
September 21	2010	90 °F
September 21	1980	90 °F
September 20	2021	91 °F
September 20	2020	90 °F
September 20	2010	92 °F
September 19	2021	97 °F
September 19	2018	92 °F
September 19	2014	94 °F
September 18	2018	90 °F
September 18	2000	91 °F
September 17	2021	96 °F
September 17	2018	90 °F
September 16	2021	94 °F
September 16	2018	90 °F
September 16	1910	91 °F