Current Time in Boulder, United States
Saturday, October 31, 2026
02:35:14
America/Chicago · UTC-5:00 · CST
Time Zone
America/Chicago
UTC Offset
UTC-5:00
Abbreviation
CST
DST
Active now
Boulder is in the America/Chicago time zone (UTC-5:00). Compared with Beijing time, Boulder is +13h vs Beijing. This page refreshes every second; time zone and DST rules come from the IANA tzdata database.
Sunrise & Sunset in Boulder Today
Sunrise
08:29
Sunset
18:59
Day Length
10小时30分
It is currently nighttime in Boulder. Computed from city coordinates with the NOAA solar algorithm.