"The fire’s rapid growth from 15 to 51.7 acres in less than 24 hours highlights a potentially aggressive spread, warranting close monitoring and resource allocation by state agencies."
The CUMBO wildfire was discovered on September 11, 2026, in Okanogan County, Washington, at latitude 48.1431 and longitude -120.0170. The incident, managed by the Washington Department of Natural Resources (DNR), began as a 15‑acre fire and expanded to 50 acres within the first hour, eventually reaching 51.7 acres by the latest update on September 12, 2026. No official containment percentage, personnel deployment, or fire behavior details have been released, and the cause remains undetermined.
Good air quality. Outdoor activity is generally safe near this incident.
Nearest reporting station: Twisp. Source: AirNow.gov (EPA).
General wildfire safety guidance applies; remain aware of local advisories and avoid outdoor activities in the affected area until further information is released.
IRWIN ID: {BC63E717-C3F4-4A8C-8D8D-4D18602962D2}
Discovered: Sep 11, 2026
Cause: Human
Managing Agency: DNR
Coordinates: 48.1431, -120.017
Other wildfires that have recently been contained or dropped from official tracking in WA.
The CUMBO Fire has burned 52 acres as of September 12, 2026.
The CUMBO Fire has not yet reached any official containment.
The official cause has been listed as: Human.
The CUMBO Fire is burning in Okanogan, WA.
No, the CUMBO Fire is no longer listed as active by NIFC.
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