Cascade 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 |
|---|---|---|---|
| Oct 5, 2024 | 12 hrs | 12,024 (30%) | High Wind |
| May 8, 2024 | 118 hrs | 10,468 (26%) | Heavy Snow |
| Apr 12, 2021 | 6 hrs | 6,002 (15%) | Unnamed event |
| Nov 8, 2020 | 29 hrs | 5,616 (14%) | Unnamed event |
| Feb 1, 2020 | 18 hrs | 5,244 (13%) | Unnamed event |
Over the 6 years from 2020 to 2025, Cascade County recorded 298 distinct power outage events, averaging 3.3 hours per event.
The single worst outage on record in Cascade County started October 5, 2024 (High Wind), lasting 12 hours and leaving up to 12,024 customers without power (30% of the county) at its peak.
August has historically been the worst month for outages in Cascade County, with 39 events recorded during that month across the dataset.
Based on this history, Cascade County earns a Reliability Grade of B, placing it in the 69th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Cascade County's outage profile
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Similar counties in Montana
Counties with the closest reliability grade and national percentile to Cascade County.
| County | Grade | National percentile |
|---|---|---|
| Wibaux County | B | 69th |
| Liberty County | B | 69th |
| Phillips County | B | 69th |
| Prairie County | B | 71st |
| Ravalli County | B | 72nd |
FAQ
How often does power go out in Cascade County?
Between 2020 and 2025, Cascade County recorded 298 outage events, averaging 3.3 hours each.
What is Cascade County's reliability grade?
Cascade County has a Reliability Grade of B, in the 69th national percentile.
What was the worst power outage in Cascade County?
The worst outage on record started October 5, 2024 (High Wind), lasting 12 hours and affecting up to 12,024 customers.