Custer CountyPower Outage History
2015–2025 · Colorado
Top 20% most reliable nationally — infrequent, short outages.
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Aug 26, 2025 | 2 hrs | 1,767 (38%) | Unnamed event |
| Apr 19, 2025 | 4 hrs | 1,755 (37%) | Heavy Snow |
| Jun 11, 2019 | <1 hr | 1,753 (37%) | Unnamed event |
| Jul 25, 2018 | <1 hr | 1,734 (37%) | Hail |
| Sep 9, 2018 | 2 hrs | 1,732 (37%) | Unnamed event |
Over the 11 years from 2015 to 2025, Custer County recorded 56 distinct power outage events, averaging 2.6 hours per event.
The single worst outage on record in Custer County started August 26, 2025, lasting 2 hours and leaving up to 1,767 customers without power (38% of the county) at its peak.
August has historically been the worst month for outages in Custer County, with 15 events recorded during that month across the dataset.
Based on this history, Custer County earns a Reliability Grade of A, placing it in the 84th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Custer County's outage profile
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Outage-prep kit
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Similar counties in Colorado
Counties with the closest reliability grade and national percentile to Custer County.
| County | Grade | National percentile |
|---|---|---|
| Eagle County | A | 84th |
| Moffat County | A | 84th |
| Delta County | A | 85th |
| Pueblo County | A | 84th |
| Broomfield County | A | 85th |
Most reliable counties in Colorado
The top 3 counties in Colorado by reliability grade and percentile.
| County | Grade | National percentile |
|---|---|---|
| Rio Blanco County | A | 99th |
| Baca County | A | 98th |
| Washington County | A | 98th |
Least reliable counties in Colorado
The bottom 3 counties in Colorado by reliability grade and percentile.
| County | Grade | National percentile |
|---|---|---|
| Clear Creek County | F | 16th |
| Cheyenne County | D | 20th |
| Jackson County | D | 22nd |
Most reliable counties nationally
The top 3 counties nationally by reliability grade and percentile.
| County | State | Grade | National percentile |
|---|---|---|---|
| Clay County | South Dakota | A | 100th |
| Clearwater County | Minnesota | A | 99th |
| Limestone County | Alabama | A | 99th |
Least reliable counties nationally
The bottom 3 counties nationally by reliability grade and percentile.
| County | State | Grade | National percentile |
|---|---|---|---|
| Clay County | West Virginia | F | 0th |
| Lincoln County | West Virginia | F | 0th |
| Cameron Parish | Louisiana | F | 0th |
FAQ
How often does power go out in Custer County?
Between 2015 and 2025, Custer County recorded 56 outage events, averaging 2.6 hours each.
What is Custer County's reliability grade?
Custer County has a Reliability Grade of A, in the 84th national percentile.
What was the worst power outage in Custer County?
The worst outage on record started August 26, 2025, lasting 2 hours and affecting up to 1,767 customers.