Sisi Fire

Active

Chelan County, Washington · Discovered August 14, 2026

4,325 acres
Size
15%
Contained
No growth
24h growth
62
Personnel

Source: NIFC/IRWIN (interagency) · Last upstream update 8 hours ago · Perimeter mapped 8 hours ago (NIFC WFIGS)

Current situation

Sisi Fire

Active fire
Wind
19 mph E
Air quality · Good
AQI 17

The Sisi Fire fire has burned 4,325 acres in Chelan County, Washington. Crews have reached 15% containment. It has shown no measurable growth in the last 24 hours. Wind at the fire is blowing 19 mph toward the E, with gusts to 43 mph. Air quality near the fire is good (AQI 17). 62 personnel are assigned to the incident.

Latest official update

August 23, 2026

The Sisi Fire is located in the Okanogan-Wenatchee National Forest within a remote, steep, and rugged mountainous landscape. The surrounding area consists of forested slopes, drainages, and variable terrain near the communities of Lucerne, Holden Village, and Stehekin. The fire is burning in a mosaic of timber, timber understory, brush, and partially cured grasses, with abundant snags and heavy dead and down fuels. Fire behavior remains active, including backing, flanking, uphill and up-drainage runs, group tree torching, and spotting. The greatest potential for growth remains along the…

Read the full update on InciWeb

Posted by the incident management team on InciWeb (inciweb.wildfire.gov).

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Incident timeline

Generated automatically from official feeds the moment they change: size, containment, evacuation zones, aircraft, and incident team updates.

  1. New perimeter mapped at 4,325 acres (national perimeter feed)

    31 hours ago · September 27, 2026

  2. Grew 117 acres in 23 hours to 4,275 acres

    4 days ago · September 24, 2026

  3. New perimeter mapped at 4,169 acres (national perimeter feed)

    5 days ago · September 24, 2026

  4. New perimeter mapped at 3,993 acres (national perimeter feed)

    6 days ago · September 22, 2026

  5. Grew 232 acres in 5 days to 3,908 acres

    7 days ago · September 22, 2026

  6. New perimeter mapped at 3,838 acres (national perimeter feed)

    8 days ago · September 20, 2026

  7. New perimeter mapped at 3,731 acres (national perimeter feed)

    10 days ago · September 18, 2026

  8. Containment rose to 15%

    11 days ago · September 17, 2026

  9. New perimeter mapped at 3,676 acres (national perimeter feed)

    12 days ago · September 16, 2026

  10. New perimeter mapped at 3,449 acres (national perimeter feed)

    13 days ago · September 15, 2026

  11. Containment dropped to 5% (from 11%)

    16 days ago · September 13, 2026

  12. Grew 139 acres in 24 hours to 3,193 acres

    16 days ago · September 13, 2026

  13. Grew 242 acres in 22 hours to 3,054 acres

    17 days ago · September 12, 2026

  14. Grew 100 acres in 3 days to 2,812 acres

    18 days ago · September 11, 2026

  15. Grew 191 acres in 48 hours to 2,712 acres

    21 days ago · September 8, 2026

  16. Grew 277 acres in 4 days to 2,521 acres

    23 days ago · September 6, 2026

  17. Containment rose to 11%

    24 days ago · September 4, 2026

  18. Containment rose to 5%

    26 days ago · September 3, 2026

  19. Grew 140 acres in 25 hours to 2,244 acres

    27 days ago · September 2, 2026

  20. Grew 310 acres in 47 hours to 2,104 acres

    28 days ago · September 1, 2026

  21. Grew 290 acres in 24 hours to 1,794 acres

    30 days ago · August 30, 2026

  22. Grew 626 acres in 4 days to 1,504 acres

    31 days ago · August 29, 2026

  23. Grew 144 acres in 2 days to 878 acres

    35 days ago · August 25, 2026

  24. Official incident page published on InciWeb: Sisi Fire

    36 days ago · August 23, 2026

  25. Grew 228 acres in 26 hours to 734 acres

    37 days ago · August 23, 2026

  26. Grew 381 acres in 22 hours to 506 acres

    38 days ago · August 21, 2026

  27. Containment dropped to 0% (from 15%)

    39 days ago · August 21, 2026

  28. Grew 75 acres in 2 hours to 125 acres

    39 days ago · August 21, 2026

  29. Now mapped at 50 acres

    39 days ago · August 20, 2026

  30. Fire first listed in official incident feeds

    45 days ago · August 14, 2026
Raw growth & containment readings
RecordedSizeContained
9/27/2026, 11:46:24 PM4,325 acres15%
9/25/2026, 11:43:54 PM4,305 acres15%
9/24/2026, 11:59:01 PM4,275 acres15%
9/24/2026, 12:50:23 AM4,158 acres15%
9/22/2026, 11:53:49 PM3,993 acres15%
9/22/2026, 12:43:45 AM3,908 acres15%
9/19/2026, 3:19:22 AM3,731 acres15%
9/17/2026, 10:09:24 PM3,691 acres15%
9/17/2026, 12:01:41 AM3,676 acres5%
9/15/2026, 11:41:19 PM3,449 acres5%
9/13/2026, 12:11:50 AM3,193 acres5%
9/12/2026, 12:27:25 AM3,054 acres11%
9/11/2026, 2:22:18 AM2,812 acres11%
9/10/2026, 1:56:28 AM2,764 acres11%
9/9/2026, 1:56:27 AM2,748 acres11%
9/8/2026, 2:21:11 AM2,712 acres11%
9/6/2026, 2:20:33 AM2,521 acres11%
9/4/2026, 8:38:54 PM2,244 acres11%
9/4/2026, 12:04:18 AM2,244 acres9%
9/3/2026, 1:19:29 AM2,244 acres5%

Recorded by Fire Nearby each time upstream data changes.

About this data

Fire Nearby aggregates official incident data and shows exactly when each value was last updated. For evacuation decisions, always follow instructions from local emergency officials and check county emergency management channels.