Current Local Time in Boulder, Colorado, USA

1:56:23 am MST

Friday, December 19, 2025

Country:	United States
State:	Colorado (CO)
Lat/Long:	40°01'N / 105°16'W
Elevation:	1623 m
Currency:	United States Dollar (USD)
Languages:	English
Country Code:	+1

°F

Weather

54 °F

Clear.
63 / 37 °F

Sat 20.		58 / 34 °F
Sun 21.		53 / 32 °F

More weather details

Time Zone

MST (Mountain Standard Time)
UTC/GMT -7 hours

DST started

Mar 9, 2025
Forward 1 hour

DST ended

Nov 2, 2025
Back 1 hour

Difference

1 hour behind
Chicago

About MST — Mountain Standard Time

Set your location

Sunrise

7:18 am
↑ 120° Southeast

Sunset

4:38 pm
↑ 240° Southwest

Day length

9 hours, 20 minutes
-9s shorter

Moon 0.6%

Rise – 7:21 am
Set – 4:04 pm

More Sun & Moon in Boulder
+ Show More Twilight and Moon Phase Information

Solar Noon

Sun in South: 11:58 am
Altitude: 26.6°

Astronomical
Twilight

5:40 am – 6:13 am
5:42 pm – 6:15 pm

Nautical
Twilight

6:13 am – 6:47 am
5:08 pm – 5:42 pm

Civil
Twilight

6:47 am – 7:18 am
4:38 pm – 5:08 pm

Previous
Moon Phase

Third Quarter
December 11, 2025
1:51 pm

Next
Moon Phase

New Moon
December 19, 2025
6:43 pm

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Tools & Converters

Calendar & Holidays

Create the United States calendar

Upcoming Holidays

More Holidays in the United States

Airports

Denver International Airport, DEN
About 33 mi ESE of Boulder
Colorado Springs Airport, COS
About 89 mi SSE of Boulder

Other cities near Boulder

Fullscreen Exit

Boulder

USA

1:56 23 am

Friday, December 19, 2025