Castle Rock
Sunrise and sunset in Castle Rock
Today’s sunrise, sunset and twilight in Castle Rock, in local time. At 39.4° N, the day lasts from 9 h 23 min at the winter solstice to 14 h 57 min at the summer solstice.
Today · worked out at
Wednesday, October 21: sunrise at 07:15, sunset at 18:11.
Day length 10 h 56 min, 2 min 26 s shorter than yesterday.
Solar noon at 12:43, with the Sun 40° above the horizon.
Times are Castle Rock time (MDT).
Twilight and golden hour today
| Today | Morning | Evening |
|---|---|---|
| Astronomical twilight | 05:45 | 19:41 |
| Nautical twilight | 06:17 | 19:10 |
| Civil twilight | 06:48 | 18:38 |
| Sunrise and sunset | 07:15 | 18:11 |
| Golden hour | 07:15–07:52 | 17:34–18:11 |
Each twilight begins at the morning time and ends at the evening one.
The year in Castle Rock
- Longest day: June 21, 14 h 57 min, from sunrise at 05:32 to sunset at 20:29.
- Shortest day: December 21, 9 h 23 min, from sunrise at 07:15 to sunset at 16:39.
Sunrise and sunset on the 21st of each month, 2026
| Date | Sunrise | Sunset | Day length |
|---|---|---|---|
| January 21 | 07:14 | 17:07 | 9 h 52 min |
| February 21 | 06:43 | 17:43 | 11 h 00 min |
| March 21 | 07:01 | 19:12 | 12 h 12 min |
| April 21 | 06:13 | 19:43 | 13 h 30 min |
| May 21 | 05:40 | 20:11 | 14 h 31 min |
| June 21 | 05:32 | 20:29 | 14 h 57 min |
| July 21 | 05:49 | 20:21 | 14 h 31 min |
| August 21 | 06:17 | 19:46 | 13 h 29 min |
| September 21 | 06:46 | 18:57 | 12 h 12 min |
| October 21 | 07:15 | 18:11 | 10 h 56 min |
| November 21 | 06:49 | 16:40 | 9 h 50 min |
| December 21 | 07:15 | 16:39 | 9 h 23 min |
Good to know
- Sunrise and sunset are when the top of the Sun meets a level horizon, allowing for the usual bending of light by the air. Hills, buildings and height shift what you see by a few minutes.
- Civil, nautical and astronomical twilight end when the Sun is 6°, 12° and 18° below the horizon. Golden hour here is the photographers’ usual definition: the Sun less than 6° above it.
- Worked out when the page loads from NOAA’s solar equations, for 39.4° N, 104.9° W, and accurate to about a minute.
How the layers work, where their data comes from and what they can’t tell you: Day and night, live, The Sun, Moon and planets
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