Mm115 Hwy 20 Fire

Elmore County, Idaho · Wildfire

No longer active Official numbers updated Aug 13, 2026 (23 days ago)

First reported about 4 weeks ago

Metric	Last report	Now	Change
Size	4,936 acres Aug 11, 4:00 PM	5,139 acres Sep 5, 2:00 AM +203 acres was 4,936 acres · Aug 11, 4:00 PM	+203 acres in 24 days
Containment	50% Aug 12, 7:00 PM	90% Sep 5, 2:00 AM +40 percent was 50% · Aug 12, 7:00 PM	+40 percent in 23 days
Crew size	268 Aug 12, 7:00 PM	252 Sep 5, 2:00 AM −16 was 268 · Aug 12, 7:00 PM	−16 in 23 days
Money spent	$4.0M Aug 12, 7:00 PM	$4.5M Sep 5, 2:00 AM +$500,000 was $4.0M · Aug 12, 7:00 PM	+$500,000 in 23 days

Mm115 Hwy 20 Fire summary

The Mm115 Hwy 20 Fire is a wildfire near Elmore County, Idaho. It has burned about 5,139 acres (about 4,000 football fields). Crews have boxed in 90% of its edge; the other 10% isn't contained yet. It was first reported about 4 weeks ago. About 252 people are on it, run by a Type 3 IC.

Size: 5,139 acres
Containment: 90%
Discovered: August 7, 2026 (first reported about 4 weeks ago)
Cause: Not reported

The size and containment above are current as of Wednesday, August 12th at 9:01 p.m. CDT.

Weather & fire-spread conditions

⚠️ Red Flag Warning in effect. The National Weather Service has flagged conditions here — usually wind plus dry air — that can make fires spread fast. This is the official warning that fire danger is high 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.

Tonight

61°F · Patchy Smoke

Wind 3 to 8 mph ENE · 0% chance of rain

Wind: Calm Heat: Cool Dry

Thursday

77°F · Patchy Smoke

Wind 5 to 13 mph S · 10% chance of rain

Wind: Breezy Heat: Warm Dry

Thursday Night

57°F · Patchy Smoke

Wind 6 to 9 mph SE · 39% chance of rain

Wind: Calm Heat: Cool Some rain

Friday

76°F · Chance Showers And Thunderstorms

Wind 8 mph SSE · 44% chance of rain

Wind: Calm Heat: Warm Some rain

Friday Night

56°F · Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms

Wind 3 to 7 mph ENE · 25% chance of rain

Wind: Calm Heat: Cool Some rain

Forecast from the National Weather Service (weather.gov), pulled Wednesday, August 12th at 9:05 p.m. CDT.

Who's on it

About 252 people are assigned to this fire, run by a Type 3 IC. The government rates it a Type 4 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 Mm115 Hwy 20 Fire

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

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