Colorado dense fog advisories
There are no dense fog advisories in Colorado right now. The last one was issued on November 13, 2026.
Fog will reduce visibility to a quarter mile or less, making driving hazardous.
Updated from the National Weather Service · lists refresh hourly; the live map loads current alerts directly from the NWS
Map data: NWS, OpenFreeMap, OpenStreetMap
Active dense fog advisories in Colorado
None right now. Other active alerts in Colorado: 2 (see the Colorado alerts page).
Dense Fog Advisories in Colorado by year
Colorado averaged 39.2 dense fog advisories per year from 2016 to 2025, and has had 24 so far in 2026. The most recent was issued on November 13, 2026.
Counties with the most dense fog advisories
| County | 2016–2025 |
|---|---|
| Kit Carson County | 122 |
| Yuma County | 116 |
| Cheyenne County | 103 |
| Weld County | 52 |
| Grand County | 44 |
| Broomfield County | 35 |
| Douglas County | 34 |
| Phillips County | 33 |
| Arapahoe County | 32 |
| Denver County | 32 |
What a dense fog advisory means
Dense fog can cause chain-reaction crashes on highways because drivers suddenly lose sight of the road ahead.
More about dense fog advisories and the national map →
What to do
- Slow down, use low-beam headlights and leave plenty of distance.
- Never use high beams in fog.
More Colorado alerts
- Tornado Warnings
- Tornado Watches
- Severe Thunderstorm Warnings
- Flash Flood Warnings
- Flood Warnings
- Flood Watches
- Winter Storm Warnings
- Winter Storm Watches
- Winter Weather Advisories
- Blizzard Warnings
- Cold Weather Advisories
- Freeze Warnings
- Frost Advisories
- Heat Advisories
- High Wind Warnings
- Wind Advisories
- Red Flag Warnings
- All Colorado alerts