Current Local Time in Boulder, Colorado, USA

4:37:10 am MST

Friday, December 5, 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

30 °F

Clear.
42 / 26 °F

Sat 6.		48 / 29 °F
Sun 7.		42 / 26 °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

2 hours behind
Columbus

About MST — Mountain Standard Time

Set your location

Sunrise

7:07 am
↑ 119° Southeast

Sunset

4:35 pm
↑ 241° Southwest

Day length

9 hours, 28 minutes
-1m 1s shorter

Moon 99.4%

Set – 8:17 am
Rise – 5:09 pm

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

Solar Noon

Sun in South: 11:51 am
Altitude: 27.5°

Astronomical
Twilight

5:31 am – 6:03 am
5:39 pm – 6:12 pm

Nautical
Twilight

6:03 am – 6:37 am
5:05 pm – 5:39 pm

Civil
Twilight

6:37 am – 7:07 am
4:35 pm – 5:05 pm

Previous
Moon Phase

Full Moon
December 4, 2025
4:14 pm

Next
Moon Phase

Third Quarter
December 11, 2025
1:51 pm

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Tools & Converters

Calendar & Holidays

Create the United States calendar

Upcoming Holidays

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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

4:3710am

Friday, December 5, 2025