| Current: | MST — Mountain Standard Time |
|---|---|
| Next Change: | MDT — Mountain Daylight Time |
| Current Offset: | UTC/GMT -7 hours |
| Difference: | 1 hour behind Chicago |
2025 Time Zones - Boulder
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
The graph above illustrates clock changes in Boulder during 2025.
Time Changes in Boulder Over the Years
Daylight Saving Time (DST) changes do not necessarily occur on the same date every year.
| Year | Date & Time | Abbreviation | Time Change | Offset After |
|---|---|---|---|---|
| 2024 | Sun, Mar 10 at 2:00 am | MST → MDT | +1 hour (DST start) | UTC-6h |
| Sun, Nov 3 at 2:00 am | MDT → MST | -1 hour (DST end) | UTC-7h | |
| 2025 | Sun, Mar 9 at 2:00 am | MST → MDT | +1 hour (DST start) | UTC-6h |
| Sun, Nov 2 at 2:00 am | MDT → MST | -1 hour (DST end) | UTC-7h | |
| 2026 | Sun, Mar 8 at 2:00 am | MST → MDT | +1 hour (DST start) | UTC-6h |
| Sun, Nov 1 at 2:00 am | MDT → MST | -1 hour (DST end) | UTC-7h | |
| 2027 | Sun, Mar 14 at 2:00 am | MST → MDT | +1 hour (DST start) | UTC-6h |
| Sun, Nov 7 at 2:00 am | MDT → MST | -1 hour (DST end) | UTC-7h | |
| 2028 | Sun, Mar 12 at 2:00 am | MST → MDT | +1 hour (DST start) | UTC-6h |
| Sun, Nov 5 at 2:00 am | MDT → MST | -1 hour (DST end) | UTC-7h | |
| * All times are local Boulder time. Next time change is highlighted. | ||||
Data for the years before 1970 is not available for Boulder, however, we have earlier time zone history for Denver available.
More Information
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Boulder
USA
2:22
51
am
Friday, December 19, 2025