Colorado Power Outage Season
When outages happen most in Colorado, and what to expect.
July is historically Colorado's busiest month for recorded power outages, part of a summer season (June–August) that accounts for about 38% of all recorded outages statewide, averaging 2.8 hours per event. 1 of Colorado's 53 tracked counties currently carry a Reliability Grade of F.
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Colorado outages by month
Total recorded events and average duration per event, summed across every tracked county in Colorado.
Peak season insight
Colorado's outage season runs June–August, accounting for 38% of all recorded outages. July has the highest frequency.
Month-by-month data table
| Month | Events | Avg duration |
|---|---|---|
| January | 1,278 | 2.3 hrs |
| February | 1,219 | 2.5 hrs |
| March | 1,822 | 3.0 hrs |
| April | 1,999 | 2.4 hrs |
| May | 2,667 | 2.7 hrs |
| June | 3,497 | 2.3 hrs |
| July | 3,746 | 2.1 hrs |
| August | 3,352 | 2.0 hrs |
| September | 2,375 | 3.7 hrs |
| October | 2,378 | 2.9 hrs |
| November | 1,868 | 2.4 hrs |
| December | 1,781 | 3.5 hrs |
This month in Colorado
October has historically recorded 2,378 outage events across Colorado, above the state's typical monthly average. Outages that start in October have averaged 2.9 hours.
Main causes by season
Named storms behind Colorado's worst recorded outages, from the NOAA Storm Events Database.
Winter (December–February)
- High Wind
- Drought
- Heavy Snow
- Winter Storm
- Extreme Cold/Wind Chill
Spring (March–May)
- Winter Storm
- Drought
- Frost/Freeze
- Blizzard
- Heavy Snow
Summer (June–August)
- Hail
- Drought
- Thunderstorm Wind
- Heavy Rain
- Tornado
Fall (September–November)
- Winter Storm
- Wildfire
- Winter Weather
- Drought
- Strong Wind
Colorado's worst outage events on record
The five largest outages in Colorado by duration and customers affected.
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Dec 17, 2025 | 148 hrs | 60,021 (36%) | High Wind |
| Dec 17, 2025 | 142 hrs | 51,319 (18%) | High Wind |
| Apr 6, 2024 | 86 hrs | 73,150 (26%) | High Wind |
| Mar 13, 2019 | 78 hrs | 61,512 (15%) | Blizzard |
| Dec 15, 2021 | 123 hrs | 33,979 (9%) | High Wind |
Highest-risk counties in Colorado
Lowest reliability percentile among Colorado's tracked counties.
| County | Grade | National percentile |
|---|---|---|
| Clear Creek County | F | 16th |
| Cheyenne County | D | 20th |
| Jackson County | D | 22nd |
| Park County | D | 23rd |
| Summit County | D | 24th |
Live weather alerts for Colorado
Special Weather Statement
Special Weather Statement issued October 1 at 7:57AM MDT by NWS Pueblo CO
Read the official NWS alert →Flood Watch
Flood Watch issued October 1 at 12:57AM MDT until October 1 at 6:00PM MDT by NWS Goodland KS
Read the official NWS alert →Flood Watch
Flood Watch issued October 1 at 12:49AM MDT until October 1 at 12:00PM MDT by NWS Pueblo CO
Read the official NWS alert →These live alerts come from the National Weather Service. They are public-safety information, not an outage prediction.
Colorado power outage FAQ
When do power outages happen most in Colorado?
July is historically the busiest single month for recorded outages in Colorado, and Summer (June–August) accounts for about 38% of all recorded outages across the state.
How long do power outages in Colorado typically last?
Across Colorado's tracked counties, the average recorded outage lasts about 2.8 hours, though individual events -- especially named storms -- can run much longer.
Which counties in Colorado have the highest outage risk?
Clear Creek County, Cheyenne County, Jackson County, Park County, Summit County currently rank lowest for reliability in Colorado. See each county's page for its full history.
Does this page predict a power outage in Colorado?
No. It describes patterns in recorded county-level outage history, not a guaranteed future event. Check the live National Weather Service alerts below for current conditions.
Prepare for Colorado's outage season
Sized for Colorado's recorded outage frequency and duration.
