Seattle, WA to Thornton, CO: time difference
Thornton, CO is 1 h ahead of Seattle, WA. 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.
Seattle, WA 14:55 2:55 PM Thornton, CO 15:55 3:55 PM You –:–
14:55 2:55 PM
Pacific Daylight Time · UTC-7
☀️ 07:33 · 🌙 18:17
15:55 3:55 PM
Mountain Daylight Time · UTC-6
☀️ 07:14 · 🌙 18:17
·
+1 h
Thornton, CO is 1 h ahead of Seattle, WA.
When you, Seattle, WA and Thornton, CO are all at the desk
Pick the working hours below – the window every location shares appears once your time zone is known.
Working hours
🇺🇸 Seattle, WA
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
🇺🇸 Thornton, CO
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 0 12 AM
📍 Your time
- Asleep
- Early
- Working hours
- Evening
- Both working
- Right now
Time zones side by side
| Detail | 🇺🇸 Seattle, WA | 🇺🇸 Thornton, CO |
|---|---|---|
| Local time | 14:55 | 15:55 |
| Local date | Sunday, October 18, 2026 | Sunday, October 18, 2026 |
| Time zone | Pacific Daylight Time | Mountain Daylight Time |
| UTC offset | UTC-7 | UTC-6 |
| Offset from Seattle, WA | — | +1 h |
| IANA zone | America/Los Angeles | America/Denver |
| Daylight saving | On summer time → UTC-8, Nov 1, 01:00 | On summer time → UTC-7, Nov 1, 01:00 |
| Sunrise | 07:33 | 07:14 |
| Sunset | 18:17 | 18:17 |
| Daylight | 10 h 44 min | 11 h 3 min |
| People on this clock | 737,015 | 139,478 |
Compare Seattle, WA with another city
More comparisons with Seattle, WA: the time zones next to it and the far side of the clock.
Nearby time zones
Big time differences
Seattle, WA and Thornton, CO: common questions
What is the time difference between Seattle, WA, and Thornton, CO?
Thornton is 1 hour ahead: it uses UTC−6, while Seattle is on UTC−7.
What time is it in Thornton, CO, when it is 9:00 AM in Seattle, WA?
When it is 9:00 AM in Seattle, it is 10:00 AM in Thornton.
What time is it in Thornton, CO, when it is 6:00 PM in Seattle, WA?
When it is 6:00 PM in Seattle, it is 7:00 PM in Thornton.
Is there a time when both Seattle, WA, and Thornton, CO, are at work?
Yes: from 9:00 AM to 5:00 PM in Seattle (10:00 AM to 6:00 PM in Thornton), the working days (9:00 AM–6:00 PM) overlap.
When does the date change in Thornton, CO, compared with Seattle, WA?
The new day starts in Thornton earlier: at 11:00 PM in Seattle it is already midnight there. Until 1:00 AM in Thornton, Seattle is still on the previous day.
Is the time difference between Seattle, WA, and Thornton, CO, the same all year?
Yes. Both places switch to summer time and back on the same dates, so the gap remains 1 hour.
