Boulder — sunrise and sunset times

Calculate sunrise and sunset times in Boulder, day length for any day of the year.

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Boulder — sunrise, sunset, length of day 10/10/2025
Sunrise	07:05:53 am
Sunset	06:30:24 pm
Day length	11:24:31
Sun at zenith	12:48:09 pm
Civil dawn	06:38:51 am
Civil dusk	06:57:26 pm
Nautical dawn	06:07:30 am
Nautical dusk	07:28:48 pm
Astronomical dawn	05:36:04 am
Astronomical dusk	08:00:13 pm