North Fork Lost Horse Fire

Ravalli County, Montana · Wildfire

Active Official numbers updated Sep 3, 2026 (6 days ago)

First reported about 7 weeks ago

Metric	Last report	Now	Change
Size	117 acres Aug 3, 8:00 PM	118 acres Sep 9, 5:00 AM +1 acres was 117 acres · Aug 3, 8:00 PM	+1 acres in about 1 month
Containment	60% Aug 17, 5:01 PM	70% Sep 9, 5:00 AM +10 percent was 60% · Aug 17, 5:01 PM	+10 percent in 22 days
Crew size	48 Sep 3, 3:00 PM	3 Sep 9, 5:00 AM −45 was 48 · Sep 3, 3:00 PM	−45 in 6 days
Money spent	$4.6M Aug 20, 6:01 PM	$4.8M Sep 9, 5:00 AM +$140,240 was $4.6M · Aug 20, 6:01 PM	+$140,240 in 19 days

North Fork Lost Horse Fire summary

The North Fork Lost Horse Fire is a wildfire near Ravalli County, Montana. It has burned about 118 acres (about 89 football fields). Crews have boxed in 70% of its edge; the other 30% isn't contained yet. It was first reported about 7 weeks ago. About 3 people are on it, run by a Type 4 IC. We're also tracking 8 other active fires within about 75 miles.

Size: 118 acres
Containment: 70%
Discovered: July 25, 2026 (first reported about 7 weeks ago)
Cause: Not reported

The size and containment above are current as of Wednesday, September 9th at 5:00 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.

Overnight

43°F · Clear

Wind 6 mph SSE · 0% chance of rain

Wind: Calm Heat: Cool Dry

Wednesday

72°F · Sunny

Wind 5 to 9 mph SW · 0% chance of rain

Wind: Calm Heat: Cool Dry

Wednesday Night

48°F · Mostly Clear

Wind 5 to 13 mph SSW · 0% chance of rain

Wind: Breezy Heat: Cool Dry

Thursday

76°F · Sunny

Wind 14 mph SSW · 0% chance of rain

Wind: Breezy Heat: Warm Dry

Thursday Night

50°F · Light Rain Likely

Wind 5 to 9 mph WSW · 64% chance of rain

Wind: Calm Heat: Cool Rain likely

Forecast from the National Weather Service (weather.gov), pulled Wednesday, September 9th at 5:01 a.m. CDT.

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Who's on it

About 3 people are assigned to this fire, run by a Type 4 IC. 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 North Fork Lost Horse Fire

Within about 75 miles we're tracking 8 other active fires, closest first:

See all active fires in Montana →

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