MT to COT Time Converter
COT is 1 hour ahead of MT. The US Mountain states are currently on MDT (UTC-6:00), and COT is UTC-5:00.
Best Time to Call Between MT and COT
Both zones are inside normal business hours between 9:00 AM and 4:00 PM MT — that's 10:00 AM to 5:00 PM COT. That's a 7-hour window.
both at work MT only COT only neither — hours along the strip are MT.
Common Times Converted
MT on the left, COT on the right.
MT to COT: Full 24-Hour Conversion Table
Shaded rows are working hours; the darker shade marks the hours when both zones are at work.
| MT | COT | Working hours |
|---|---|---|
| 12:00 AM | 1:00 AM | — |
| 1:00 AM | 2:00 AM | — |
| 2:00 AM | 3:00 AM | — |
| 3:00 AM | 4:00 AM | — |
| 4:00 AM | 5:00 AM | — |
| 5:00 AM | 6:00 AM | — |
| 6:00 AM | 7:00 AM | — |
| 7:00 AM | 8:00 AM | — |
| 8:00 AM | 9:00 AM | COT only |
| 9:00 AM | 10:00 AM | Both zones |
| 10:00 AM | 11:00 AM | Both zones |
| 11:00 AM | 12:00 PM | Both zones |
| 12:00 PM | 1:00 PM | Both zones |
| 1:00 PM | 2:00 PM | Both zones |
| 2:00 PM | 3:00 PM | Both zones |
| 3:00 PM | 4:00 PM | Both zones |
| 4:00 PM | 5:00 PM | MT only |
| 5:00 PM | 6:00 PM | — |
| 6:00 PM | 7:00 PM | — |
| 7:00 PM | 8:00 PM | — |
| 8:00 PM | 9:00 PM | — |
| 9:00 PM | 10:00 PM | — |
| 10:00 PM | 11:00 PM | — |
| 11:00 PM | 12:00 AM next day | — |
What MT and COT Actually Are
MT — Mountain Time
Denver, Salt Lake City, Calgary, Edmonton — and Phoenix, which does not change its clocks. Standing at UTC-7:00 as written, and the region does change its clocks, so its live offset moves by an hour twice a year. The next change is on Sunday, November 1, 2026, to MST.
Mountain Time contains the most conspicuous daylight saving exception in North America: Arizona, which has opted out since 1968.
COT — Colombia Time
Bogotá, Medellín, Cali, Barranquilla. Standing at UTC-5:00 as written, and the region does not change its clocks, so that offset holds all year.
Colombia briefly tried daylight saving during the energy crisis of 1992-93 and has not repeated it.
What This Means in Practice
This gap is not fixed
MT changes its clocks and COT does not, so the difference between them moves by an hour twice a year. A recurring meeting set now will drift for one side from Sunday, November 1, 2026 unless someone resets it.
Close enough to share a working day
At only 1 hour apart, the two working days overlap almost completely. Scheduling is barely constrained by the difference.
Major Cities in Each Zone
Cities on MT
Cities on COT
Frequently Asked Questions
What is the time difference between MT and COT?
COT is 1 hour ahead of MT. That is the live figure. Taken strictly as written, the gap between MT and COT is 2 hours — the two differ because at least one of these regions is currently on daylight saving.
What is 9:00 AM MT in COT?
9:00 AM MT is 10:00 AM COT.
What are the best hours to schedule a call between MT and COT?
Between 9:00 AM and 4:00 PM MT, which is 10:00 AM to 5:00 PM COT. Both sides are inside normal business hours through that window.
Does the difference between MT and COT change during the year?
Yes. MT observes daylight saving and COT does not, so the gap shifts by an hour at least twice a year. The next clock change is on Sunday, November 1, 2026.