Time Difference Between Colorado and California: MT vs. PT Explained

The time difference between Colorado and California depends on the season due to Daylight Saving Time (DST) observance.

Standard Time (November–March)

• Colorado: Mountain Standard Time (MST) = UTC−7
• California: Pacific Standard Time (PST) = UTC−8
• Difference: Colorado is 1 hour ahead

Example: When it's 12:00 PM in Denver, it's 11:00 AM in Los Angeles.

Daylight Saving Time (March–November)

• Colorado: Mountain Daylight Time (MDT) = UTC−6
• California: Pacific Daylight Time (PDT) = UTC−7
• Difference: Colorado is 1 hour ahead

Wait—both shift forward one hour, so the 1-hour difference persists year-round.

Correction: The Original Text Was Wrong

The source claimed "during DST... both states observe UTC−07:00, so there is no time difference." This is incorrect.

• California on PDT = UTC−7
• Colorado on MDT = UTC−6
• Difference remains 1 hour (Colorado ahead)

Both states observe DST (unlike Arizona, which stays on MST year-round). The Mountain/Pacific 1-hour offset is constant.

Practical Implications

• Scheduling calls/meetings: Always 1-hour offset
• Travel: Flying west (DEN→LAX): "gain" 1 hour; flying east: "lose" 1 hour
• TV/streaming: Live events air 1 hour earlier in California
• Financial markets: NYSE opens 9:30 ET = 7:30 MT = 6:30 PT

Exceptions Within States

• Arizona (mostly): No DST → MST year-round = matches PDT in summer, MST in winter
• Navajo Nation (AZ/UT/NM): Observes DST → MDT in summer
• California: Entire state observes DST (prop to make permanent DST failed)
• Colorado: Entire state observes DST

Quick Reference

Bottom line: Colorado is always 1 hour ahead of California. The original source contained an error about DST eliminating the difference.