Colorado (Mountain Time) is 2 hours behind New York (Eastern Time) during standard time, and 1 hour behind during daylight saving time.
| Period | Colorado | New York | Difference |
|---|---|---|---|
| Early Nov – Mid Mar | MST (UTC−7) | EST (UTC−5) | 2 hours |
| Mid Mar – Early Nov | MDT (UTC−6) | EDT (UTC−4) | 1 hour |
Example: 12:00 PM in Denver in January = 2:00 PM in NYC. In July = 1:00 PM in NYC.
Note: Both observe DST (2nd Sun Mar – 1st Sun Nov), so the 1-hour summer difference is consistent. Arizona (also MT) does NOT observe DST, so CO–AZ difference flips seasonally.