Boston Time to MST Converter
MST is 2 hours behind EST. 9:00 AM EST = 7:00 AM MST.
MST is 2 hours behind EST. To convert Boston Time to MST, subtract 2 hours from the Boston Time time: 9:00 AM EST = 7:00 AM MST.
Boston Time (Boston time) is used in Boston, USA. MST (Mountain Time) is used in Denver, Salt Lake City, Albuquerque, Calgary, Edmonton; Phoenix (Arizona) all year.
Most of Arizona uses MST all year and does not switch to MDT.
Boston Time to MST time conversion table
Boston Time to MST on 7 Nov 2026. Today's date. Highlighted rows are 9 AM–5 PM in both places.
| Boston Time | MST | Day |
|---|---|---|
| 12:00 AM EST | 10:00 PM MST | previous day |
| 1:00 AM EST | 11:00 PM MST | previous day |
| 2:00 AM EST | 12:00 AM MST | night |
| 3:00 AM EST | 1:00 AM MST | night |
| 4:00 AM EST | 2:00 AM MST | night |
| 5:00 AM EST | 3:00 AM MST | night |
| 6:00 AM EST | 4:00 AM MST | night |
| 7:00 AM EST | 5:00 AM MST | night |
| 8:00 AM EST | 6:00 AM MST | — |
| 9:00 AM EST | 7:00 AM MST | — |
| 10:00 AM EST | 8:00 AM MST | — |
| 11:00 AM EST | 9:00 AM MST | work hours |
| 12:00 PM EST | 10:00 AM MST | work hours |
| 1:00 PM EST | 11:00 AM MST | work hours |
| 2:00 PM EST | 12:00 PM MST | work hours |
| 3:00 PM EST | 1:00 PM MST | work hours |
| 4:00 PM EST | 2:00 PM MST | work hours |
| 5:00 PM EST | 3:00 PM MST | — |
| 6:00 PM EST | 4:00 PM MST | — |
| 7:00 PM EST | 5:00 PM MST | — |
| 8:00 PM EST | 6:00 PM MST | — |
| 9:00 PM EST | 7:00 PM MST | — |
| 10:00 PM EST | 8:00 PM MST | — |
| 11:00 PM EST | 9:00 PM MST | — |
- Work rows — 9 AM–5 PM in both places
- Night in the destination (10 PM–6 AM)
How to convert Boston Time to MST
Subtract 2 hours from the Boston Time time to get MST.
Example: 9:00 AM EST = 7:00 AM MST.
Across midnight: 1:00 AM EST = 11:00 PM MST (previous day). The date changes, so always check the day as well as the hour.
Time difference between Boston Time and MST
The time difference between Boston Time and MST is 2 hours all year – MST is behind EST.
Boston Time and MST during daylight saving time
- Boston Time next changes on 14 Mar 2027: clocks go forward one hour at 01:59 local time, from EST (UTC−5) to EDT (UTC−4).
- MST next changes on 14 Mar 2027: clocks go forward one hour at 01:59 local time, from MST (UTC−7) to MDT (UTC−6).
Best time for a meeting between Boston Time and MST
Boston Time and MST share 6 hours of the 9 AM–5 PM working day. Any time between 11:00 AM and 5:00 PM EST lands between 9:00 AM and 3:00 PM MST, inside working hours for both.
Boston Time to MST FAQ
What is the time difference between Boston Time and MST?
MST is 2 hours behind EST all year. 9:00 AM EST = 7:00 AM MST.
What is 9 AM Boston Time in MST?
9:00 AM EST is 7:00 AM MST.
What is 12 PM (noon) Boston Time in MST?
12:00 PM EST is 10:00 AM MST.
Is MST ahead of or behind Boston Time?
MST is 2 hours behind EST, so it is earlier in MST than in Boston Time.
Does Boston Time change for daylight saving time?
Yes. Boston Time next changes on 14 Mar 2027, when clocks go forward one hour from EST to EDT.
Does MST change for daylight saving time?
Yes. MST next changes on 14 Mar 2027, when clocks go forward one hour from MST to MDT.
What is the best time for a meeting between Boston Time and MST?
Boston Time and MST share 6 hours of the 9 AM–5 PM working day. Any time between 11:00 AM and 5:00 PM EST lands between 9:00 AM and 3:00 PM MST, inside working hours for both.
Is MT the same as MST?
MST is the winter (standard) name of Mountain Time (MT). From March to November the same clocks are called MDT. This converter always uses the one in force on the date you choose.
Related conversions
Convert MST to Boston Time
Convert Boston Time to other time zones
Convert other time zones to MST
Learn more
Updated 7 November 2026. Time zone data: IANA tz database.