Are Mountain and AZ Time the Same?
It depends on the season:
- Winter (Nov-Mar): Arizona = MST = UTC-7. Same as Colorado, Utah, New Mexico. ✓
- Summer (Mar-Nov): Other Mountain states move to MDT (UTC-6). Arizona stays at UTC-7. Arizona is 1 hour behind the rest of the Mountain zone. ✗
Why Doesn't Arizona Observe DST?
Arizona opted out in 1968. The state is already extremely hot in summer — extending evening daylight would mean more hours of intense heat.
The Navajo Nation Exception
The Navajo Nation within Arizona DOES observe DST, creating a patchwork within the state.
Quick Answer
In winter, yes — both MST (UTC-7). In summer, no — Mountain states move to MDT (UTC-6) while Arizona stays at UTC-7.
