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Contained

Thorn

San Diego, CA ยท Undetermined

This fire is no longer active. It burned 1,234 acres in San Diego before dropping off the national incident feed.

0%Inactive

1,234

Acres Burned

71

Days Burning

Jul 15, 2026

Discovered

2mo ago

Last Update

Growth

No growth in the last day, containment at 100%
Jul 16 / 30 acresJul 20 / 1,234 acres

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Public Lands Nearby

12 public land units within 75 miles

Carrizo Gorge Wilderness Area

Go

Wilderness / CA

7.6 mi

NE

Sawtooth Mountains Wilderness Area

Check first

Wilderness / CA

14.7 mi

N

Hauser Wilderness

Check first

Wilderness / CA

15.9 mi

W

Pine Creek Wilderness

Check first

Wilderness / CA

17.5 mi

W

Guatay Mtn Purchase Unit

Check first

National Forest / CA

18.4 mi

NW

Jacumba Wilderness Area

Go

Wilderness / CA

19.2 mi

E

Coyote Mountains Wilderness Area

Go

Wilderness / CA

19.6 mi

NE

Fish Creek Mountains Wilderness Area

Go

Wilderness / CA

27 mi

NE

Otay Mountain Wilderness Area

Check first

Wilderness / CA

30.2 mi

W

San Diego National Wildlife Refuge

Check first

Wildlife Refuge / CA

34.4 mi

W

San Diego Bay National Wildlife Refuge

Check first

Wildlife Refuge / CA

45.4 mi

W

Tijuana Slough National Wildlife Refuge

Check first

Wildlife Refuge / CA

46.6 mi

W

Situation Updates

Changes read from NIFC interagency perimeter data

THORN update: 1,234 acres, 100% contained

Perimeter data
Jul 19

Per interagency perimeter data, the THORN containment moved from 85% to 100%.

IRWIN

THORN update: 1,234 acres, 85% contained

Perimeter data
Jul 19

Per interagency perimeter data, the THORN containment moved from 75% to 85%.

IRWIN

THORN update: 1,234 acres, 75% contained

Perimeter data
Jul 18

Per interagency perimeter data, the THORN containment moved from 45% to 75%.

IRWIN

THORN mapped at 1,234 acres, 45% contained

Perimeter data
Jul 17

Interagency perimeter data shows the THORN at 1,234 acres, 45% contained.

IRWIN

THORN update: 1,201 acres, 0% contained

Perimeter data
Jul 16

Per interagency perimeter data, the THORN grew 1,171 acres to 1,201.

IRWIN

THORN mapped at 30 acres

Perimeter data
Jul 16

Interagency perimeter data shows the THORN at 30 acres.

IRWIN

Timeline

Jul 15Now

71 days since discovery

Other Fires in CA

5 additional active fires

Plaskett

Monterey, CA

30K acres

97%

Timber

Monterey, CA

26K acres

59%

Dome

Mariposa, CA

4.1K acres

16%

Chileno

Marin, CA

341 acres

95%

Juniper

San Bernardino, CA

7 acres

0%

Data Sources

Fire data from NIFC Wildland Fire Interagency Geospatial Services (WFIGS) via IRWIN. Satellite hotspots from NASA FIRMS VIIRS. Situation updates are either posted by the incident management team on InciWeb or read by us from WFIGS perimeter data, and each one says which. Air quality data from EPA AirNow. Public lands boundaries from USGS PAD-US 4.0.

IRWIN ID: 03c8555b-5842-496f-b327-63dff323756f

Important

More Than Just Parks aggregates third-party data from EPA AirNow, NOAA, NASA FIRMS, and NIFC/WFIGS. Readings can be delayed, estimated, incomplete, or wrong, and conditions on the ground change quickly. This tool is for general information only and is not a substitute for official air quality alerts, fire and evacuation orders, land manager closures, or emergency services. Verify with the managing agency and local authorities before making any travel, health, or safety decision. We make no warranty as to accuracy and accept no liability for decisions made using this information. This is not an emergency or evacuation tool. If you are near a fire, follow official evacuation orders and call 911. Terms of Service.