Big Rock Fire

Jefferson County, Idaho · Wildfire

No longer active Official numbers updated Aug 13, 2026 (about 1 month ago)

First reported about 7 weeks ago

Metric	Last report	Now	Change
Size	2,149 acres Aug 6, 5:00 PM	2,142 acres Sep 15, 1:00 AM −7 acres was 2,149 acres · Aug 6, 5:00 PM	−7 acres in about 1 month
Containment	97% Aug 13, 5:00 PM	100% Sep 15, 1:00 AM +3 percent was 97% · Aug 13, 5:00 PM	+3 percent in about 1 month
Crew size	65 Aug 13, 5:00 PM	3 Sep 15, 1:00 AM −62 was 65 · Aug 13, 5:00 PM	−62 in about 1 month
Money spent	$3.5M Aug 13, 5:00 PM	$3.5M Sep 15, 1:00 AM +$15,000 was $3.5M · Aug 13, 5:00 PM	+$15,000 in about 1 month

Big Rock Fire summary

The Big Rock Fire is a wildfire near Jefferson County, Idaho. It has burned about 2,142 acres (about 2,000 football fields). Crews have it fully contained, with a line all the way around it. It was first reported about 7 weeks ago. About 3 people are on it, run by a Type 5 IC.

Size: 2,142 acres
Containment: 100%
Discovered: July 31, 2026 (first reported about 7 weeks ago)
Cause: Not reported

The size and containment above are current as of Friday, August 14th at 11:01 a.m. CDT.

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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

73°F · Slight Chance Showers And Thunderstorms then Showers And Thunderstorms Likely

Wind 9 mph SSW · 65% chance of rain

Wind: Calm Heat: Cool Rain likely

Tonight

52°F · Chance Showers And Thunderstorms then Mostly Cloudy

Wind 7 mph ESE · 38% chance of rain

Wind: Calm Heat: Cool Some rain

Saturday

76°F · Slight Chance Light Rain then Chance Showers And Thunderstorms

Wind 5 to 8 mph S · 54% chance of rain

Wind: Calm Heat: Warm Rain likely

Saturday Night

52°F · Slight Chance Showers And Thunderstorms then Mostly Clear

Wind 7 mph SE · 20% chance of rain

Wind: Calm Heat: Cool Some rain

Sunday

81°F · Sunny

Wind 3 to 9 mph S · 2% chance of rain

Wind: Calm Heat: Warm Dry

Forecast from the National Weather Service (weather.gov), pulled Friday, August 14th at 11:04 a.m. CDT.

Who's on it

About 3 people are assigned to this fire, run by a Type 5 IC. The government rates it a Type 2 Incident. About $4 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 Big Rock Fire

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

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