Sheridan 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 24, 2020 | 20 hrs | 1,246 (43%) | Funnel Cloud |
| Jun 11, 2020 | <1 hr | 1,205 (42%) | High Wind |
| Jul 10, 2018 | 46 hrs | 1,194 (41%) | Thunderstorm Wind |
| Jan 14, 2021 | <1 hr | 991 (34%) | Drought |
| Mar 23, 2017 | <1 hr | 649 (23%) | Flood |
Over the 9 years from 2017 to 2025, Sheridan County recorded 264 distinct power outage events, averaging 2.4 hours per event.
The single worst outage on record in Sheridan County started July 24, 2020 (Funnel Cloud), lasting 20 hours and leaving up to 1,246 customers without power (43% of the county) at its peak.
July has historically been the worst month for outages in Sheridan County, with 162 events recorded during that month across the dataset.
Based on this history, Sheridan County earns a Reliability Grade of B, placing it in the 75th percentile nationally for grid reliability (higher percentile = more reliable).
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Read our mission →Similar counties in Montana
Counties with the closest reliability grade and national percentile to Sheridan County.
| County | Grade | National percentile |
|---|---|---|
| Pondera County | B | 76th |
| Jefferson County | B | 77th |
| Rosebud County | B | 78th |
| Lewis and Clark County | B | 73rd |
| Hill County | B | 72nd |
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 Sheridan County?
Between 2017 and 2025, Sheridan County recorded 264 outage events, averaging 2.4 hours each.
What is Sheridan County's reliability grade?
Sheridan County has a Reliability Grade of B, in the 75th national percentile.
What was the worst power outage in Sheridan County?
The worst outage on record started July 24, 2020 (Funnel Cloud), lasting 20 hours and affecting up to 1,246 customers.