Statewide coverage
Mountain Time
All of Colorado is legally in Mountain Time.
- Standard time
- MST · UTC-07:00
- Daylight time
- MDT · UTC-06:00
- Daylight saving
- Varies within this zone
- IANA identifiers
- America/Denver, America/Boise, America/Phoenix
CO time guide
Time Zones in Colorado
Colorado is entirely in Mountain Time and observes daylight saving time statewide.
1 time zoneOne statewide zoneObserved statewide
Time-zone coverage
Daylight saving time in Colorado
Colorado follows the federal daylight-saving schedule.
Check an address near a boundary
Time-zone boundaries can follow county lines and local legal definitions rather than a simple east-west line. Check the exact address when timing matters.
Find a time zone by address