Boulder CountyPower Outage History
What this grade means
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 |
|---|---|---|---|
| Dec 17, 2025 | 148 hrs | 60,021 (36%) | High Wind |
| Feb 15, 2019 | <1 hr | 44,170 (27%) | High Wind |
| Mar 23, 2016 | 43 hrs | 41,639 (25%) | Winter Storm |
| Apr 6, 2024 | 86 hrs | 40,368 (24%) | High Wind |
| Jan 1, 2022 | 73 hrs | 30,294 (18%) | Unnamed event |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Boulder County, Colorado that day.
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).
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 |
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 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.