EST to MST time
Mountain Time is two hours behind Eastern Time in Denver every day of the year, so 11:00 AM in New York is 9:00 AM in Colorado. Arizona keeps standard time all year, which makes Phoenix three hours behind New York from March to November.
Convert the other way: MST → EST
- Difference right now
- MST 2 hours behind EST
- Shared office hours
- 8 PM–2 AM EST
- Daylight saving
- Both zones shift their clocks
EST to MST, hour by hour
Every hour of the day, using today's offsets (daylight saving is applied automatically).
- 12:00 AM10:00 PM−1
- 1:00 AM11:00 PM−1
- 2:00 AM12:00 AM
- 3:00 AM1:00 AM
- 4:00 AM2:00 AM
- 5:00 AM3:00 AM
- 6:00 AM4:00 AM
- 7:00 AM5:00 AM
- 8:00 AM6:00 AM
- 9:00 AM7:00 AM
- 10:00 AM8:00 AM
- 11:00 AM9:00 AM
- 12:00 PM10:00 AM
- 1:00 PM11:00 AM
- 2:00 PM12:00 PM
- 3:00 PM1:00 PM
- 4:00 PM2:00 PM
- 5:00 PM3:00 PM
- 6:00 PM4:00 PM
- 7:00 PM5:00 PM
- 8:00 PM6:00 PM
- 9:00 PM7:00 PM
- 10:00 PM8:00 PM
- 11:00 PM9:00 PM
Booking calls with Mountain-time colleagues
Eastern organizers tend to underestimate how early Mountain mornings start. A 9:00 AM Eastern kickoff is 7:00 AM in Denver and Salt Lake City, and in summer it is 6:00 AM in Phoenix. A safer opening slot is 11:00 AM Eastern (9:00 AM Mountain, or 8:00 AM in Phoenix in summer). At the other end, 5:00 PM Eastern is 3:00 PM in Denver, leaving the Mountain team two more working hours.
Because Arizona never changes, an East Coast recurring meeting set at 1:00 PM will appear at 11:00 AM in Phoenix in winter and 10:00 AM in summer. If your calendar tool lets you pick a city, choose "Phoenix" or "Denver" rather than a generic "MST" entry.
Flights west and late kickoffs
Westbound, you gain two hours. A nonstop from Newark or LaGuardia to Denver takes roughly four and a half hours, so an 8:00 AM departure lands around 10:30 AM Mountain, in time for a full afternoon. Ski travelers heading to Colorado or Utah in winter often use this to reach the slopes the same day.
Mountain-zone home games start late by East Coast clocks. A Denver Broncos home game in the late window kicks off at 2:05 or 2:25 PM Mountain, which is 4:05 or 4:25 PM Eastern, and a Colorado Rockies night game at 6:40 PM Mountain begins at 8:40 PM Eastern. For the opposite direction, see MST to EST.
Clock changes this year
- Mar 8, 2026EST: clocks go forward, UTC−5 → UTC−4
- Nov 1, 2026EST: clocks go back, UTC−4 → UTC−5
- Mar 8, 2026MST: clocks go forward, UTC−7 → UTC−6
- Nov 1, 2026MST: clocks go back, UTC−6 → UTC−7
Cities on these zones
Other conversions with these zones
Frequently asked questions
- What time is 4 PM Eastern in Denver?
- It is 2:00 PM in Denver. Subtract two hours from Eastern time in every season.
- Is Arizona on the same time as Colorado?
- In winter, yes. In summer Colorado moves to daylight time and Arizona does not, so Phoenix is one hour behind Denver from March to November.
- What should I write in an invite for someone in Phoenix?
- Write the Phoenix time explicitly, for example "1 PM ET / 10 AM Phoenix" in summer. Avoid "MT" alone, since it can be read as Denver time.
- Is Boise on Mountain time?
- Yes. Southern Idaho, including Boise, uses Mountain Time. The northern panhandle around Coeur d'Alene uses Pacific Time.
- How early is a 9 AM Eastern meeting in Salt Lake City?
- It starts at 7:00 AM in Salt Lake City, all year.