Boulder County Power Outage History
2014–2025 · Colorado
Average — typical outage frequency and duration nationally. How grades are calculated
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Dec 17, 2025 | 148 hrs | 60,021 (36%) | High Wind |
| Feb 15, 2019 | 1 hrs | 44,170 (27%) | High Wind |
| Mar 23, 2016 | 43 hrs | 41,639 (25%) | Winter Weather |
| Apr 6, 2024 | 86 hrs | 40,368 (24%) | High Wind |
| Jan 1, 2022 | 73 hrs | 30,294 (18%) | Unnamed event |
Over the 12 years from 2014 to 2025, Boulder County recorded 1,244 distinct power outage events, averaging 2.6 hours per event.
The single worst outage on record in Boulder County started December 17, 2025 (High Wind), lasting 148 hours and leaving up to 60,021 customers without power (36% of the county) at its peak.
October has historically been the worst month for outages in Boulder County, with 184 events recorded during that month across the dataset.
Based on this history, Boulder County earns a Reliability Grade of C, placing it in the 48th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Boulder County's outage profile
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Similar counties in Colorado
Counties with the closest reliability grade and national percentile to Boulder County.
| County | Grade | National percentile |
|---|---|---|
| Costilla County | C | 50th |
| Jefferson County | C | 45th |
| Teller County | C | 52nd |
| Crowley County | C | 52nd |
| Archuleta County | C | 44th |
FAQ
How often does power go out in Boulder County?
Between 2014 and 2025, Boulder County recorded 1,244 outage events, averaging 2.6 hours each.
What is Boulder County's reliability grade?
Boulder County has a Reliability Grade of C, in the 48th national percentile.
What was the worst power outage in Boulder County?
The worst outage on record started December 17, 2025 (High Wind), lasting 148 hours and affecting up to 60,021 customers.