| Sunrise | Sunset | Daylight | |
|---|---|---|---|
| Today | 06:14 | 19:47 | 13h 33m |
| Tomorrow | 06:12 | 19:48 | 13h 36m |
| Change | −2m | +1m | +3m |
Positive change in sunset / daylight = days are getting longer. Negative change in sunrise = sun is rising earlier.
Today's light segments for Boulder, CO. Amber = daylight, violet = twilight, dark = night.
Sunrise and sunset on the 1st of each month in Boulder, CO.
| Month | Sunrise | Sunset | Daylight |
|---|---|---|---|
| January | 07:24 | 16:46 | 9h 22m |
| February | 07:11 | 17:19 | 10h 08m |
| March | 06:37 | 17:52 | 11h 15m |
| April | 06:47 | 19:24 | 12h 37m |
| May | 06:03 | 19:55 | 13h 52m |
| June | 05:36 | 20:24 | 14h 48m |
| July | 05:36 | 20:35 | 14h 59m |
| August | 05:59 | 20:17 | 14h 18m |
| September | 06:29 | 19:36 | 13h 07m |
| October | 06:57 | 18:47 | 11h 50m |
| November | 07:30 | 18:01 | 10h 31m |
| December | 07:04 | 16:38 | 9h 34m |
Boulder, CO is located at 40.02°N, 105.27°W. Its latitude determines how dramatically daylight hours change through the year.
The city uses the America/Denver timezone (MDT). It observes Daylight Saving Time, so sunrise and sunset times shift by one hour in spring and autumn.
Solar noon — the moment the sun reaches its highest point in the sky — occurs when the sun crosses the local meridian. In Boulder, CO this falls around 13:00 in mid-summer and 11:51 in December, reflecting UTC offset and any DST adjustments.