Hill County Power Outage History
2020–2025 · Montana
Better than average — fewer or shorter outages than most counties. How grades are calculated
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Nov 5, 2021 | 6 hrs | 7,180 (75%) | Unnamed event |
| Dec 17, 2025 | 12 hrs | 7,012 (73%) | Heavy Snow |
| Aug 8, 2024 | 2 hrs | 6,203 (64%) | Unnamed event |
| Dec 23, 2025 | 3 hrs | 6,060 (63%) | High Wind |
| Apr 4, 2020 | 8 hrs | 4,618 (48%) | Unnamed event |
Over the 6 years from 2020 to 2025, Hill County recorded 140 distinct power outage events, averaging 2.6 hours per event.
The single worst outage on record in Hill County started November 5, 2021, lasting 6 hours and leaving up to 7,180 customers without power (75% of the county) at its peak.
August has historically been the worst month for outages in Hill County, with 21 events recorded during that month across the dataset.
Based on this history, Hill County earns a Reliability Grade of B, placing it in the 72nd percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Hill County's outage profile
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Outage-prep kit
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Similar counties in Montana
Counties with the closest reliability grade and national percentile to Hill County.
| County | Grade | National percentile |
|---|---|---|
| Ravalli County | B | 72nd |
| Prairie County | B | 71st |
| Lewis and Clark County | B | 73rd |
| Cascade County | B | 69th |
| Wibaux County | B | 69th |
FAQ
How often does power go out in Hill County?
Between 2020 and 2025, Hill County recorded 140 outage events, averaging 2.6 hours each.
What is Hill County's reliability grade?
Hill County has a Reliability Grade of B, in the 72nd national percentile.
What was the worst power outage in Hill County?
The worst outage on record started November 5, 2021, lasting 6 hours and affecting up to 7,180 customers.