Gallatin County Power Outage History
2019–2025 · Montana
Top 20% most reliable nationally — infrequent, short outages. How grades are calculated
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Nov 24, 2025 | 1 hrs | 13,980 (14%) | Thunderstorm Wind |
| Nov 24, 2025 | 1 hrs | 13,958 (14%) | Thunderstorm Wind |
| Aug 29, 2024 | 4 hrs | 12,843 (13%) | Unnamed event |
| Sep 12, 2024 | 9 hrs | 11,492 (12%) | Wildfire |
| Oct 16, 2022 | 6 hrs | 11,296 (11%) | Unnamed event |
Over the 7 years from 2019 to 2025, Gallatin County recorded 301 distinct power outage events, averaging 3.2 hours per event.
The single worst outage on record in Gallatin County started November 24, 2025 (Thunderstorm Wind), lasting 1 hours and leaving up to 13,980 customers without power (14% of the county) at its peak.
July has historically been the worst month for outages in Gallatin County, with 46 events recorded during that month across the dataset.
Based on this history, Gallatin County earns a Reliability Grade of A, placing it in the 92nd percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Gallatin County's outage profile
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Similar counties in Montana
Counties with the closest reliability grade and national percentile to Gallatin County.
| County | Grade | National percentile |
|---|---|---|
| Stillwater County | A | 90th |
| Dawson County | A | 93rd |
| Big Horn County | A | 94th |
| Fallon County | A | 94th |
| Roosevelt County | A | 94th |
FAQ
How often does power go out in Gallatin County?
Between 2019 and 2025, Gallatin County recorded 301 outage events, averaging 3.2 hours each.
What is Gallatin County's reliability grade?
Gallatin County has a Reliability Grade of A, in the 92nd national percentile.
What was the worst power outage in Gallatin County?
The worst outage on record started November 24, 2025 (Thunderstorm Wind), lasting 1 hours and affecting up to 13,980 customers.