Sinlahekin Fire
Active
Okanogan County, Washington · Discovered July 26, 2026
Source: NIFC/IRWIN (interagency) · Last upstream update 14 days ago
Sinlahekin Fire
The Sinlahekin Fire fire has burned 166,007 acres in Okanogan County, Washington. Crews have fully contained the fire. It has shown no measurable growth in the last 24 hours. Wind at the fire is blowing 7 mph toward the NE, with gusts to 19 mph. Air quality near the fire is good (AQI 20). 122 personnel are assigned to the incident.
Sinlahekin Fire size over time
41 official size readingsGrew from 148K to 166K acres across these reports.
Acreage as reported by the official incident feed, recorded by Fire Nearby each time it changes. Hover or tap the chart for each reading.
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Incident timeline
Generated automatically from official feeds the moment they change: size, containment, evacuation zones, aircraft, and incident team updates.
Fire reported 100% contained
26 days ago · October 15, 2026Containment rose to 98%
39 days ago · October 3, 2026Containment rose to 92%
52 days ago · September 20, 2026Containment rose to 81%
56 days ago · September 16, 2026New perimeter mapped at 166,021 acres (national perimeter feed)
60 days ago · September 12, 2026Containment rose to 76%
62 days ago · September 9, 2026Mapped size revised down to 166,018 acres (from 166,151)
62 days ago · September 9, 2026Containment rose to 67%
64 days ago · September 8, 2026Containment rose to 59%
65 days ago · September 7, 2026Containment rose to 52%
66 days ago · September 6, 2026Mapped size revised down to 166,151 acres (from 166,290)
68 days ago · September 4, 2026Mapped size revised down to 166,290 acres (from 166,413)
69 days ago · September 3, 2026Mapped size revised down to 166,413 acres (from 166,868)
72 days ago · August 31, 2026Containment dropped to 41% (from 53%)
73 days ago · August 30, 2026Grew 652 acres in 25 hours to 166,868 acres
73 days ago · August 30, 2026Grew 3,215 acres in 24 hours to 166,216 acres
74 days ago · August 29, 2026Grew 6,302 acres in 24 hours to 163,001 acres
75 days ago · August 28, 2026Grew 1,208 acres in 24 hours to 156,699 acres
76 days ago · August 27, 2026Grew 282 acres in 48 hours to 155,491 acres
77 days ago · August 26, 2026Containment rose to 53%
79 days ago · August 24, 2026Grew 729 acres in 24 hours to 155,209 acres
79 days ago · August 24, 2026Grew 182 acres in 48 hours to 154,480 acres
80 days ago · August 23, 2026Grew 120 acres in 47 hours to 154,298 acres
82 days ago · August 21, 2026Containment rose to 47%
83 days ago · August 20, 2026Grew 335 acres in 24 hours to 154,178 acres
84 days ago · August 19, 2026Grew 1,161 acres in 3 days to 153,843 acres
85 days ago · August 18, 2026Grew 832 acres in 24 hours to 152,682 acres
88 days ago · August 15, 2026Containment rose to 42%
89 days ago · August 14, 2026Mapped size revised down to 151,850 acres (from 152,921)
89 days ago · August 14, 2026Containment dropped to 37% (from 42%)
90 days ago · August 13, 2026Grew 2,680 acres in 22 hours to 152,921 acres
90 days ago · August 13, 2026Grew 2,526 acres in 13 hours to 150,241 acres
91 days ago · August 12, 2026Fire first listed in official incident feeds at 147,715 acres
91 days ago · August 11, 2026Official incident page published on InciWeb: Sinlahekin Fire
106 days ago · July 27, 2026
Raw growth & containment readings
| Recorded | Size | Contained |
|---|---|---|
| 10/15/2026, 9:51:18 PM | 166,007 acres | 100% |
| 10/4/2026, 1:18:15 AM | 166,007 acres | 99% |
| 10/3/2026, 2:09:26 AM | 166,007 acres | 98% |
| 10/2/2026, 1:11:13 AM | 166,007 acres | 96% |
| 10/1/2026, 2:29:28 AM | 166,007 acres | 94% |
| 9/24/2026, 2:50:24 AM | 166,007 acres | 93% |
| 9/23/2026, 1:38:49 AM | 166,007 acres | 92% |
| 9/20/2026, 1:09:24 AM | 166,005 acres | 92% |
| 9/17/2026, 1:41:43 AM | 166,012 acres | 84% |
| 9/16/2026, 1:46:17 AM | 166,000 acres | 81% |
| 9/15/2026, 1:11:07 AM | 166,000 acres | 77% |
| 9/13/2026, 1:52:53 AM | 166,026 acres | 76% |
| 9/11/2026, 1:22:17 AM | 166,021 acres | 76% |
| 9/9/2026, 11:21:32 PM | 166,018 acres | 76% |
| 9/8/2026, 12:41:12 AM | 166,084 acres | 67% |
| 9/7/2026, 2:25:47 AM | 166,116 acres | 59% |
| 9/6/2026, 12:05:33 AM | 166,114 acres | 52% |
| 9/5/2026, 1:17:38 AM | 166,106 acres | 44% |
| 9/4/2026, 12:14:17 AM | 166,151 acres | 38% |
| 9/3/2026, 12:44:53 AM | 166,290 acres | 38% |
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.