Thornton, CO to Seattle, WA: time difference
Seattle, WA is 1 h behind Thornton, 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.
Thornton, CO 09:16 9:16 AM Seattle, WA 08:16 8:16 AM You –:–
09:16 9:16 AM
Mountain Daylight Time · UTC-6
☀️ 07:15 · 🌙 18:16
08:16 8:16 AM
Pacific Daylight Time · UTC-7
☀️ 07:35 · 🌙 18:15
·
−1 h
Seattle, WA is 1 h behind Thornton, CO.
When you, Thornton, 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
🇺🇸 Thornton, 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 | 🇺🇸 Thornton, CO | 🇺🇸 Seattle, WA |
|---|---|---|
| Local time | 09:16 | 08:16 |
| Local date | Monday, October 19, 2026 | Monday, October 19, 2026 |
| Time zone | Mountain Daylight Time | Pacific Daylight Time |
| UTC offset | UTC-6 | UTC-7 |
| Offset from Thornton, 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 | 07:15 | 07:35 |
| Sunset | 18:16 | 18:15 |
| Daylight | 11 h 1 min | 10 h 41 min |
| People on this clock | 139,478 | 737,015 |
Compare Thornton, CO with another city
More comparisons with Thornton, CO: the time zones next to it and the far side of the clock.
Nearby time zones
Big time differences
Thornton, CO and Seattle, WA: common questions
What is the time difference between Thornton, CO, and Seattle, WA?
Seattle is 1 hour behind: it uses UTC−7, while Thornton is on UTC−6.
If it is 9:00 AM in Thornton, CO, what time is it in Seattle, WA?
At 9:00 AM in Thornton, clocks in Seattle show 8:00 AM.
What time is it in Seattle, WA, when it is 6:00 PM in Thornton, CO?
When it is 6:00 PM in Thornton, it is 5:00 PM in Seattle.
When do working hours in Thornton, CO, and in Seattle, WA, overlap?
Working hours (9:00 AM–6:00 PM) overlap from 10:00 AM to 6:00 PM in Thornton, which is 9:00 AM to 5:00 PM in Seattle.
When is it still the previous day in Seattle, WA?
Until 1:00 AM in Thornton, CO, it is still the previous day in Seattle. The other way round, from 11:00 PM in Seattle it is already the next day in Thornton.
Is the time difference between Thornton, CO, and Seattle, WA, the same all year?
Yes. Both places switch to summer time and back on the same dates, so the gap remains 1 hour.
