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Sun times

Colorado · United States

Sunrise and Sunset Times Today in Boulder, Colorado

· MDT (UTC−06:00)

Sunset in Boulder is at 6:05 PM and sunrise is at 7:25 AM. There are 10h 40m of daylight.

Sunset

6:05 PM

254° W

Sunrise

7:25 AM

106° E

Daylight

10h 40m

0h 02m shorter than the previous day

Solar noon

12:45 PM

Sun altitude: 37.0°

SunriseSunset

Live countdown to the next sunrise or sunset

Times use the city center and a clear, level horizon. Hills, buildings and weather can change what you see.

Tomorrow in Boulder

Wednesday, October 28, 2026: sunset 6:03 PM, sunrise 7:26 AM. Daylight: 10h 37m.


Twilight and golden hour

Morning light

  • Astronomical dawn (−18°)5:54 AM
  • Nautical dawn (−12°)6:25 AM
  • Civil dawn (−6°)6:57 AM
  • Golden hour (−4° to +6°)7:08 AM – 8:03 AM

Evening light

  • Golden hour (+6° to −4°)5:27 PM – 6:22 PM
  • Civil dusk (−6°)6:32 PM
  • Nautical dusk (−12°)7:04 PM
  • Astronomical dusk (−18°)7:36 PM

Golden hour is an approximate photography window, not a weather forecast. About twilight and light thresholds.

Local time in Boulder

America/Denver · MDT · UTC−06:00. Daylight saving time is in effect.

The next clock change is on Sunday, November 1, 2026, from UTC−06:00 to UTC−07:00. Times in the calendar already include this change.

Clock changes and regional exceptions in United States

IANA timezone data 2026e. Future rules can change; corrections are welcome.

Sunrise and sunset calendar for Boulder


2026-10. Local times in America/Denver; clock changes apply on their actual dates.
DateSunsetSunriseDaylight
6:43 PM6:58 AM11h 46m
6:41 PM6:59 AM11h 43m
6:40 PM7:00 AM11h 40m
6:38 PM7:01 AM11h 38m
6:37 PM7:02 AM11h 35m
6:35 PM7:03 AM11h 33m
6:34 PM7:04 AM11h 30m
6:32 PM7:05 AM11h 27m
6:30 PM7:06 AM11h 25m
6:29 PM7:07 AM11h 22m
6:27 PM7:08 AM11h 20m
6:26 PM7:09 AM11h 17m
6:24 PM7:10 AM11h 15m
6:23 PM7:11 AM11h 12m
6:21 PM7:12 AM11h 09m
6:20 PM7:13 AM11h 07m
6:18 PM7:14 AM11h 04m
6:17 PM7:15 AM11h 02m
6:15 PM7:16 AM10h 59m
6:14 PM7:17 AM10h 57m
6:13 PM7:18 AM10h 54m
6:11 PM7:19 AM10h 52m
6:10 PM7:20 AM10h 49m
6:08 PM7:21 AM10h 47m
6:07 PM7:23 AM10h 45m
6:06 PM7:24 AM10h 42m
6:05 PM7:25 AM10h 40m
6:03 PM7:26 AM10h 37m
6:02 PM7:27 AM10h 35m
6:01 PM7:28 AM10h 33m
6:00 PM7:29 AM10h 30m
Download 2026 calendar (CSV)

About these times

Calculation point
40.01499°, -105.27055°
Place reference
GeoNames 5574991

Sunrise and sunset use a solar-center altitude of −0.833°, including a standard allowance for refraction and the sun’s radius. The result is rounded to the nearest minute. Terrain and unusual atmospheric conditions are not modeled.

Sources, validation and limitations