Prairie CountyPower Outage History
2017–2025 · Montana
Better than average — fewer or shorter outages than most counties. This county's outage history is better than the national median: recorded outages are less frequent and/or shorter in duration than a typical US county experienced over the same 12-year period. It isn't in the top tier nationally, but its track record points to lower-than-average outage risk.
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Jul 20, 2025 | 25 hrs | 477 (53%) | Thunderstorm Wind |
| Apr 3, 2025 | 2 hrs | 468 (52%) | Drought |
| Oct 17, 2024 | 4 hrs | 468 (52%) | Drought |
| Jul 28, 2025 | 5 hrs | 467 (52%) | Hail |
| May 13, 2025 | 3 hrs | 467 (52%) | Drought |
Over the 9 years from 2017 to 2025, Prairie County recorded 55 distinct power outage events, averaging 2.2 hours per event.
The single worst outage on record in Prairie County started July 20, 2025 (Thunderstorm Wind), lasting 25 hours and leaving up to 477 customers without power (53% of the county) at its peak.
June has historically been the worst month for outages in Prairie County, with 12 events recorded during that month across the dataset.
Based on this history, Prairie County earns a Reliability Grade of B, placing it in the 71st percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Prairie County's outage profile
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Read our mission →Similar counties in Montana
Counties with the closest reliability grade and national percentile to Prairie County.
| County | Grade | National percentile |
|---|---|---|
| Ravalli County | B | 72nd |
| Hill County | B | 72nd |
| Cascade County | B | 69th |
| Wibaux County | B | 69th |
| Liberty County | B | 69th |
Most reliable counties in Montana
The top 3 counties in Montana by reliability grade and percentile.
| County | Grade | National percentile |
|---|---|---|
| Powder River County | A | 95th |
| Roosevelt County | A | 94th |
| Fallon County | A | 94th |
Least reliable counties in Montana
The bottom 3 counties in Montana by reliability grade and percentile.
| County | Grade | National percentile |
|---|---|---|
| Lincoln County | F | 14th |
| Sanders County | D | 20th |
| Madison County | D | 31st |
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 Prairie County?
Between 2017 and 2025, Prairie County recorded 55 outage events, averaging 2.2 hours each.
What is Prairie County's reliability grade?
Prairie County has a Reliability Grade of B, in the 71st national percentile.
What was the worst power outage in Prairie County?
The worst outage on record started July 20, 2025 (Thunderstorm Wind), lasting 25 hours and affecting up to 477 customers.