What is the ISO week number in Castle Rock?

TimeDials shows the current ISO week number for Castle Rock in real time. ISO week numbers follow the ISO 8601 standard, where week 1 is the week containing the first Thursday of the year.

Does Castle Rock observe daylight saving time (DST)?

Yes, Castle Rock observes daylight saving time. The next clock change is on 2026-11-01 (clocks move back to GMT-7).

Time in Castle Rock, Colorado, United States — Local Time & Date

Live

--:--:--

Current local time in 🇺🇸 Castle Rock, Colorado, United States.

MST/MDT UTC-06:00

Relative to You

Detecting your timezone…

Relative to UTC

-6 hours behind

Noon here = 18:00 UTC

09:00 here = 15:00 UTC

12:00 here = 18:00 UTC

17:00 here = 23:00 UTC

ISO Week

11 Odd Week

Sun

07:13

18:46

Today

The small hours in Castle Rock. The city sleeps before dawn. The current offset is UTC-06:00.

Daylight Saving Time

Last Clock Change

2026-03-08

Clocks moved forward to GMT-6

Next Clock Change

2026-11-01

Clocks will move back to GMT-7

Widget Creator

Add this Castle Rock clock to your website

Customize a live Castle Rock time widget — pick your style, colors, and layout, then copy one line of code.

Get this widget

Free embed — iframe, JavaScript, or direct link.

Quick Facts

Country	🇺🇸United States
State / Region	Colorado
Timezone	MST/MDT
UTC Offset	UTC-06:00
DST	Yes — daylight saving time observed
Population	55,591
Elevation	1,903 m
Sunrise	07:13
Sunset	18:46
Coordinates	39.37°N, -104.86°E

Map

Map data © OpenStreetMap contributors

Time Difference to Major Cities

City	Difference	Local Time
New York	+2h	--:--
Los Angeles	-1h	--:--
London	+6h	--:--
Paris	+7h	--:--
Dubai	+10h	--:--
Mumbai	+11h 30m	--:--
Singapore	+14h	--:--
Tokyo	+15h	--:--
Sydney	+17h	--:--
Sao Paulo	+3h	--:--
Cairo	+8h	--:--
Shanghai	+14h	--:--

Frequently Asked Questions

What are the business hours in Castle Rock?

Standard business hours in Castle Rock are 09:00–17:00 local time (MST/MDT). Check the live clock above to see the current local time. Use our Time Zone Planner to find the best meeting time across cities.

What is the UTC offset for Castle Rock?

Castle Rock is currently at UTC-06:00. The timezone identifier is MST/MDT. When it is noon in Castle Rock, it is 18:00 UTC. You can embed a live Castle Rock clock on your website.

What ISO week number is it in Castle Rock?

It is currently ISO week 11 (odd week) in Castle Rock. ISO week numbers follow the ISO 8601 standard, where week 1 is the week containing the first Thursday of the year. Learn more about ISO week numbers.

Does Castle Rock observe daylight saving time?

Yes, Castle Rock observes daylight saving time (DST). The most recent change was on 2026-03-08, when clocks moved forward to GMT-6. The next change is on 2026-11-01, when clocks will move back to GMT-7.