Larimer County Power Outage History
2014–2025 · Colorado
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 |
|---|---|---|---|
| Mar 23, 2016 | 50 hrs | 20,820 (13%) | Winter Storm |
| Apr 6, 2024 | 47 hrs | 17,236 (11%) | High Wind |
| Mar 14, 2021 | 49 hrs | 12,879 (8%) | Winter Storm |
| Dec 17, 2025 | 25 hrs | 8,624 (5%) | High Wind |
| Nov 8, 2015 | 33 hrs | 7,267 (5%) | Unnamed event |
Over the 12 years from 2014 to 2025, Larimer County recorded 706 distinct power outage events, averaging 2.7 hours per event.
The single worst outage on record in Larimer County started March 23, 2016 (Winter Storm), lasting 50 hours and leaving up to 20,820 customers without power (13% of the county) at its peak.
June has historically been the worst month for outages in Larimer County, with 102 events recorded during that month across the dataset.
Based on this history, Larimer County earns a Reliability Grade of A, placing it in the 82nd percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Larimer County's outage profile
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Similar counties in Colorado
Counties with the closest reliability grade and national percentile to Larimer County.
| County | Grade | National percentile |
|---|---|---|
| Fremont County | A | 83rd |
| Mesa County | A | 83rd |
| Morgan County | A | 81st |
| Pueblo County | A | 84th |
| Moffat County | A | 84th |
FAQ
How often does power go out in Larimer County?
Between 2014 and 2025, Larimer County recorded 706 outage events, averaging 2.7 hours each.
What is Larimer County's reliability grade?
Larimer County has a Reliability Grade of A, in the 82nd national percentile.
What was the worst power outage in Larimer County?
The worst outage on record started March 23, 2016 (Winter Storm), lasting 50 hours and affecting up to 20,820 customers.