Area code 406
Area code 406 serves Billings and nearby parts of Montana, including Missoula, Great Falls and Bozeman. It is on Mountain Time, which observes daylight saving time.
Area code 406 at a glance
| State | Montana (MT) |
| Main city | Billings |
| Time zone | Mountain Time |
| UTC offset | UTC−7 in winter, UTC−6 in summer |
| Daylight saving time | Yes |
Cities in 406
- Billings
- Missoula
- Great Falls
- Bozeman
An area code shows where a number was first assigned. Mobile numbers keep their area code when people move, so the person you’re calling may be somewhere else.
When you can call a 406 number
Federal telemarketing rules under the TCPA allow sales calls between 8 AM and 9 PM in the called person’s local time. Here is that window for a 406 number, shown in your own time zone.
General information, not legal advice. Some states add rules for Sundays, holidays or the number of calls. See our calling hours guide.
| If you’re on | You can call 406 between |
|---|---|
| Eastern | 10:00 AM to 11:00 PM |
| Central | 9:00 AM to 10:00 PM |
| Mountain | 8:00 AM to 9:00 PM |
| Arizona | 7:00 AM to 8:00 PM |
| Pacific | 7:00 AM to 8:00 PM |
See the time in 406 without leaving your CRM
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Other area codes in Montana
406 is the only area code in our list for Montana.
Questions about 406
What time zone is area code 406?
Area code 406 is on Mountain Time. It observes daylight saving time.
Where is area code 406?
Area code 406 is in Montana. Its main city is Billings, and it also covers Missoula, Great Falls and Bozeman.
What are the legal hours to call a 406 number?
Under the federal TCPA, sales calls are allowed from 8 AM to 9 PM in the called person’s local time. Personal and informational calls are not limited by these hours.