Summit CountyPower Outage History
What this grade means
Worse than average — more frequent or longer outages than most counties. This county's recorded history shows more frequent outages and/or longer restoration times than most US counties over the same 12-year period. If you live here, it's worth taking backup power more seriously than an average household would.
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Oct 2, 2017 | 22 hrs | 13,497 (83%) | Winter Storm |
| Sep 19, 2015 | <1 hr | 10,902 (67%) | Unnamed event |
| Nov 26, 2024 | 2 hrs | 8,238 (51%) | Strong Wind |
| Dec 1, 2022 | 2 hrs | 7,502 (46%) | High Wind |
| Jan 21, 2025 | 2 hrs | 6,654 (41%) | Winter Weather |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Summit County, Colorado that day.
Over the 12 years from 2014 to 2025, Summit County recorded 806 distinct power outage events, averaging 2.9 hours per event.
The single worst outage on record in Summit County started October 2, 2017 (Winter Storm), lasting 22 hours and leaving up to 13,497 customers without power (83% of the county) at its peak.
July has historically been the worst month for outages in Summit County, with 114 events recorded during that month across the dataset.
Based on this history, Summit County earns a Reliability Grade of D, placing it in the 24th percentile nationally for grid reliability (higher percentile = more reliable).
Similar counties in Colorado
Counties with the closest reliability grade and national percentile to Summit County.
| County | Grade | National percentile |
|---|---|---|
| Park County | D | 23rd |
| Jackson County | D | 22nd |
| Cheyenne County | D | 20th |
| Conejos County | D | 29th |
| Kit Carson 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 Summit County?
Between 2014 and 2025, Summit County recorded 806 outage events, averaging 2.9 hours each.
What is Summit County's reliability grade?
Summit County has a Reliability Grade of D, in the 24th national percentile.
What was the worst power outage in Summit County?
The worst outage on record started October 2, 2017 (Winter Storm), lasting 22 hours and affecting up to 13,497 customers.