Teton CountyPower Outage History
2020–2025 · Montana
Average — typical outage frequency and duration nationally. This county sits in the middle of the national distribution — its outage frequency and duration over the past 12 years are close to the nationwide median, neither notably better nor worse than most other US counties. A typical amount of backup-power preparedness is reasonable here.
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Jun 5, 2021 | 3 hrs | 1,936 (79%) | Unnamed event |
| May 20, 2021 | 14 hrs | 1,436 (58%) | Unnamed event |
| Feb 3, 2020 | 15 hrs | 1,429 (58%) | Unnamed event |
| Dec 1, 2021 | 5 hrs | 1,401 (57%) | Unnamed event |
| Feb 19, 2020 | 2 hrs | 1,251 (51%) | Unnamed event |
Over the 6 years from 2020 to 2025, Teton County recorded 249 distinct power outage events, averaging 3.3 hours per event.
The single worst outage on record in Teton County started June 5, 2021, lasting 3 hours and leaving up to 1,936 customers without power (79% of the county) at its peak.
May has historically been the worst month for outages in Teton County, with 31 events recorded during that month across the dataset.
Based on this history, Teton County earns a Reliability Grade of C, placing it in the 41st percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Teton County's outage profile
See more picks in our Best Dual-Fuel Portable Generators for Power Outages roundup.
Champion Power Equipment 4375-Watt Dual Fuel RV Ready Portable Generator with Free 3-Year Warranty
Outage-prep kit
See our outage-prep guides.
No ads. No data selling. This site runs entirely on Amazon affiliate commissions — buying through our links costs you nothing extra and keeps it free for everyone.
Read our mission →Similar counties in Montana
Counties with the closest reliability grade and national percentile to Teton County.
| County | Grade | National percentile |
|---|---|---|
| Missoula County | C | 42nd |
| Mineral County | D | 39th |
| Meagher County | D | 38th |
| Chouteau County | D | 37th |
| Flathead County | D | 35th |
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 Teton County?
Between 2020 and 2025, Teton County recorded 249 outage events, averaging 3.3 hours each.
What is Teton County's reliability grade?
Teton County has a Reliability Grade of C, in the 41st national percentile.
What was the worst power outage in Teton County?
The worst outage on record started June 5, 2021, lasting 3 hours and affecting up to 1,936 customers.