Thorn Fire

San Diego County, California · Wildfire

No longer active Official numbers updated Jul 19, 2026 (about 1 month ago)

First reported about 7 weeks ago

Metric	Last report	Now	Change
Size	—	1,234 acres Sep 2, 12:00 AM	—
Containment	—	100% Sep 2, 12:00 AM	—
Crew size	—	52 Sep 2, 12:00 AM	—
Money spent	—	$4.9M Sep 2, 12:00 AM	—

Thorn Fire summary

The Thorn Fire is a wildfire near San Diego County, California. It has burned about 1,234 acres (about 935 football fields). Crews have it fully contained, with a line all the way around it. It was first reported about 7 weeks ago. About 52 people are on it, run by a Type 3 Team.

Size: 1,234 acres
Containment: 100%
Discovered: July 15, 2026 (first reported about 7 weeks ago)
Cause: Not reported

The size and containment above are current as of Monday, July 20th at 8:00 a.m. CDT.

Weather & fire-spread conditions

No Red Flag Warning. The National Weather Service hasn't flagged this area for dangerous fire-spread conditions right now.

Hot, dry, and windy weather can help a fire grow; cool, calm, or wet weather helps crews. The tags below rate each day for fire spread — green is calm, red can push a fire.

A general fire-weather guide (wind matters most, then how dry it is, then heat), not a prediction of what this fire will do.

Today

84°F · Mostly Sunny

Wind 10 to 20 mph W · 3% chance of rain

Wind: Windy Heat: Warm Dry

Tonight

73°F · Mostly Clear

Wind 15 to 20 mph W · 3% chance of rain

Wind: Windy Heat: Cool Dry

Tuesday

85°F · Sunny

Wind 15 to 25 mph W · 1% chance of rain

Wind: Windy Heat: Warm Dry

Tuesday Night

72°F · Mostly Clear

Wind 5 to 25 mph W · 0% chance of rain

Wind: Windy Heat: Cool Dry

Wednesday

89°F · Sunny

Wind 5 to 10 mph SW · 4% chance of rain

Wind: Breezy Heat: Warm Dry

Forecast from the National Weather Service (weather.gov), pulled Monday, July 20th at 8:03 a.m. CDT.

Who's on it

About 52 people are assigned to this fire, run by a Type 3 Team. The government rates it a Type 3 Incident. About $5 million has been spent on it so far.

The official feed reports the total headcount, not a breakdown by crew type.

Where to get live updates

We show the daily official picture. For minute-by-minute updates, evacuation orders, and maps, these do it best:

→ Watch Duty: real-time fire reporting and evacuations.
→ InciWeb: the government's official fire information site.

Nearby fires to Thorn Fire

No other active fires are near this one right now. It's on its own.

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