Flathead County Power Outage History
2014–2025 · Montana
Worse than average — more frequent or longer 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 |
|---|---|---|---|
| May 31, 2020 | 62 hrs | 34,234 (51%) | Thunderstorm Wind |
| Dec 17, 2025 | 111 hrs | 23,250 (35%) | Strong Wind |
| Nov 23, 2024 | 87 hrs | 16,911 (25%) | Winter Storm |
| Nov 2, 2022 | 13 hrs | 16,122 (24%) | Heavy Snow |
| Aug 24, 2022 | 1 hrs | 14,225 (21%) | Unnamed event |
Over the 12 years from 2014 to 2025, Flathead County recorded 776 distinct power outage events, averaging 3.2 hours per event.
The single worst outage on record in Flathead County started May 31, 2020 (Thunderstorm Wind), lasting 62 hours and leaving up to 34,234 customers without power (51% of the county) at its peak.
December has historically been the worst month for outages in Flathead County, with 101 events recorded during that month across the dataset.
Based on this history, Flathead County earns a Reliability Grade of D, placing it in the 35th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Flathead County's outage profile
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Similar counties in Montana
Counties with the closest reliability grade and national percentile to Flathead County.
| County | Grade | National percentile |
|---|---|---|
| Granite County | D | 33rd |
| Chouteau County | D | 37th |
| Meagher County | D | 38th |
| Mineral County | D | 39th |
| Madison County | D | 31st |
FAQ
How often does power go out in Flathead County?
Between 2014 and 2025, Flathead County recorded 776 outage events, averaging 3.2 hours each.
What is Flathead County's reliability grade?
Flathead County has a Reliability Grade of D, in the 35th national percentile.
What was the worst power outage in Flathead County?
The worst outage on record started May 31, 2020 (Thunderstorm Wind), lasting 62 hours and affecting up to 34,234 customers.