Chalk Mountain Fire

Carbon County, Wyoming · Wildfire

No longer active Official numbers updated Aug 28, 2026 (18 days ago)

First reported about 3 weeks ago

Metric	Last report	Now	Change
Size	100 acres Aug 27, 9:00 AM	124 acres Sep 16, 4:00 AM +24 acres was 100 acres · Aug 27, 9:00 AM	+24 acres in 20 days
Containment	75% Aug 28, 5:00 PM	91% Sep 16, 4:00 AM +16 percent was 75% · Aug 28, 5:00 PM	+16 percent in 18 days
Crew size	35 Aug 28, 5:00 PM	30 Sep 16, 4:00 AM −5 was 35 · Aug 28, 5:00 PM	−5 in 18 days
Money spent	—	$300,000 Sep 16, 4:00 AM	—

Chalk Mountain Fire summary

The Chalk Mountain Fire is a wildfire near Carbon County, Wyoming. It has burned about 124 acres (about 94 football fields). Crews have boxed in 91% of its edge; the other 9% isn't contained yet. It was first reported about 3 weeks ago. About 30 people are on it, run by a Type 4 IC.

Size: 124 acres
Containment: 91%
Discovered: August 26, 2026 (first reported about 3 weeks ago)
Cause: Not reported

The size and containment above are current as of Friday, September 11th at 6:00 p.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.

This Afternoon

72°F · Mostly Sunny

Wind 25 to 30 mph W · 4% chance of rain

Wind: High wind Heat: Cool Dry

Tonight

46°F · Slight Chance Rain Showers then Partly Cloudy

Wind 5 to 20 mph N · 15% chance of rain

Wind: Windy Heat: Cool Dry

Saturday

73°F · Mostly Sunny

Wind 5 to 15 mph SSW · 2% chance of rain

Wind: Breezy Heat: Cool Dry

Saturday Night

53°F · Partly Cloudy

Wind 0 to 15 mph WSW · 4% chance of rain

Wind: Breezy Heat: Cool Dry

Sunday

77°F · Mostly Sunny

Wind 5 to 20 mph SSW · 4% chance of rain

Wind: Windy Heat: Warm Dry

Forecast from the National Weather Service (weather.gov), pulled Friday, September 11th at 6:02 p.m. CDT.

Could this fire move fast?

Weather isn't the only thing that changes how a fire moves. The ground matters too: how steep it is, and what's growing on it. These four numbers are for the exact spot where this fire started, not the whole fire. A big fire crosses a lot of different ground.

24° slope

Fire usually moves faster uphill than downhill. Heat and flame lean uphill, drying out the ground above the fire before it gets there.

Grass and shrub (GS2)

Grass with shrubs 1 to 3 feet tall. Fire moves fast, with medium-height flames.

0% tree canopy cover

The more tree cover above a fire, the easier it is for the fire to climb from the ground into the treetops. That's called a crown fire. Crown fires move faster, throw embers farther ahead of the fire, and are harder for crews to stop head-on.

7,568 ft elevation

Elevation by itself doesn't make a fire more or less dangerous. But it shapes the other three numbers here: what grows there, how dry things get, and what the weather does.

Elevation and slope from the USGS 3D Elevation Program; fuel type and canopy cover from LANDFIRE (USGS and U.S. Forest Service), pulled Thursday, September 10th at 3:59 p.m. CDT.