Castle Rock, CO to Seattle, WA: time difference
Seattle, WA is 1 h behind Castle Rock, CO. Live clocks for both, the working hours they share, and how each one sits against your own time.
Your time
One day, 2 clocks
Drag along the band to read any hour in every place at once.
Castle Rock, CO 13:01 1:01 PM Seattle, WA 12:01 12:01 PM You –:–
13:01 1:01 PM
Mountain Daylight Time · UTC-6
☀️ 07:05 · 🌙 18:29
12:01 12:01 PM
Pacific Daylight Time · UTC-7
☀️ 07:22 · 🌙 18:32
·
−1 h
Seattle, WA is 1 h behind Castle Rock, CO.
When you, Castle Rock, CO and Seattle, WA are all at the desk
Pick the working hours below – the window every location shares appears once your time zone is known.
Working hours
🇺🇸 Castle Rock, CO
0 12 AM 1 1 AM 2 2 AM 3 3 AM 4 4 AM 5 5 AM 6 6 AM 7 7 AM 8 8 AM 9 9 AM 10 10 AM 11 11 AM 12 12 PM 13 1 PM 14 2 PM 15 3 PM 16 4 PM 17 5 PM 18 6 PM 19 7 PM 20 8 PM 21 9 PM 22 10 PM 23 11 PM
🇺🇸 Seattle, WA
23 11 PM 0 12 AM 1 1 AM 2 2 AM 3 3 AM 4 4 AM 5 5 AM 6 6 AM 7 7 AM 8 8 AM 9 9 AM 10 10 AM 11 11 AM 12 12 PM 13 1 PM 14 2 PM 15 3 PM 16 4 PM 17 5 PM 18 6 PM 19 7 PM 20 8 PM 21 9 PM 22 10 PM
📍 Your time
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Time zones side by side
| Detail | 🇺🇸 Castle Rock, CO | 🇺🇸 Seattle, WA |
|---|---|---|
| Local time | 13:01 | 12:01 |
| Local date | Saturday, October 10, 2026 | Saturday, October 10, 2026 |
| Time zone | Mountain Daylight Time | Pacific Daylight Time |
| UTC offset | UTC-6 | UTC-7 |
| Offset from Castle Rock, CO | — | −1 h |
| IANA zone | America/Denver | America/Los Angeles |
| Daylight saving | On summer time → UTC-7, Nov 1, 01:00 | On summer time → UTC-8, Nov 1, 01:00 |
| Sunrise | 07:05 | 07:22 |
| Sunset | 18:29 | 18:32 |
| Daylight | 11 h 25 min | 11 h 11 min |
| People on this clock | 73,158 | 737,015 |
Compare Castle Rock, CO with another city
More comparisons with Castle Rock, CO: the time zones next to it and the far side of the clock.
Nearby time zones
Big time differences
Castle Rock, CO and Seattle, WA: common questions
What is the time difference between Castle Rock, CO, and Seattle, WA?
Seattle is 1 hour behind: it uses UTC−7, while Castle Rock is on UTC−6.
What time is it in Seattle, WA, when it is 9:00 AM in Castle Rock, CO?
When it is 9:00 AM in Castle Rock, it is 8:00 AM in Seattle.
What time is it in Seattle, WA, when it is 6:00 PM in Castle Rock, CO?
When it is 6:00 PM in Castle Rock, it is 5:00 PM in Seattle.
When is a good time to call Seattle, WA, from Castle Rock, CO?
Between 10:00 AM and 6:00 PM in Castle Rock – that is 9:00 AM to 5:00 PM in Seattle – both places are within working hours (9:00 AM–6:00 PM).
When does the date change in Seattle, WA, compared with Castle Rock, CO?
The new day starts in Seattle later: until 1:00 AM in Castle Rock, it is still the previous day there. From 11:00 PM in Seattle, Castle Rock is already on the next day.
Does the time difference between Castle Rock, CO, and Seattle, WA, change?
No. The clocks in Castle Rock and in Seattle change on the same dates, so the difference stays 1 hour.
