Calgary to Houston Time Difference
Houston is 1 hour ahead of Calgary. When it's 10:27:15 AM in Calgary, it's 11:27:15 AM in Houston.
How Many Hours Ahead Is Houston From Calgary?
Houston is 1 hour ahead of Calgary. So Calgary is 1 hour behind Houston looking the other way — the same gap, described from the other end.
In practice that means a working day in Calgary starts when it is already 10:00 AM in Houston. The gap is not fixed all year: it becomes on Sunday, November 1, 2026, when Houston changes its clocks.
Best Time to Call Calgary and Houston
Both cities are inside normal business hours between 9:00 AM and 4:00 PM in Calgary — that's 10:00 AM to 5:00 PM in Houston. That's a 7-hour window, so a call fits comfortably in either side's working day.
both at work Calgary only Houston only neither — hours shown along the strip are Calgary local time.
Convert a Specific Time
Pick any date and time in Calgary to see the exact equivalent in Houston.
Common Times Converted
Calgary time on the left, Houston time on the right.
Calgary to Houston: Full 24-Hour Conversion Table
Based on today, Sunday, October 11, 2026 in Calgary. Shaded rows are working hours; the darker shade marks the hours when both cities are at work.
| Calgary | Houston | 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 | Houston only |
| 9:00 AM | 10:00 AM | Both cities |
| 10:00 AM | 11:00 AM | Both cities |
| 11:00 AM | 12:00 PM | Both cities |
| 12:00 PM | 1:00 PM | Both cities |
| 1:00 PM | 2:00 PM | Both cities |
| 2:00 PM | 3:00 PM | Both cities |
| 3:00 PM | 4:00 PM | Both cities |
| 4:00 PM | 5:00 PM | Calgary 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 | — |
Understanding the Calgary – Houston Time Difference
Calgary runs on America/Edmonton, currently MDT (UTC-6:00). Houston runs on America/Chicago, currently CDT (UTC-5:00). The gap of 1 hour is simply the distance between those two offsets.
Both cities observe Daylight Saving Time, but they don't switch on the same date — so for a few weeks each year the gap between them is different again. The next shift is on Sunday, November 1, 2026, when Houston adjusts its clocks and the difference becomes . Anything scheduled across that date needs checking again.
Full clock-change dates: Daylight Saving Time in Canada · Daylight Saving Time in the United States.
Calgary today
Houston today
Frequently Asked Questions
What is the time difference between Calgary and Houston?
Houston is currently 1 hour ahead of Calgary. That gap becomes on Sunday, November 1, 2026, when Houston changes its clocks.
How many hours ahead is Houston from Calgary?
Houston is 1 hour ahead of Calgary. Looking at it the other way, Calgary is 1 hour behind Houston.
What time is it in Houston when it is 9:00 AM in Calgary?
When it is 9:00 AM in Calgary, it is 10:00 AM in Houston.
Is Houston ahead of or behind Calgary?
Houston is 1 hour ahead of Calgary. Houston reaches each point in the day first, so its working day is already finishing while Calgary is still getting started.
What is the best time to call between Calgary and Houston?
Between 9:00 AM and 4:00 PM Calgary time, which is 10:00 AM to 5:00 PM in Houston. Both cities are inside normal business hours during that window.
Does the time difference between Calgary and Houston change during the year?
Yes. Both cities observe Daylight Saving Time, and they do not always switch on the same date, so the gap between them shifts during the year. It changes to on Sunday, November 1, 2026.
What time zones are Calgary and Houston in?
Calgary uses the America/Edmonton time zone, currently MDT (UTC-6:00). Houston uses America/Chicago, currently CDT (UTC-5:00).