Glass Fire

202067,971 acresCalifornia

The Glass Fire burned 67,971 acres, about 106 square miles, across 2 counties. It began on September 27, 2020.

Watch how it happened

Glass Fire · 2020

How it happened

Watch it burn in the order satellites saw it, coloured by how severely each place burned.

About this replay

Date (UTC)—Historical replay

Burned so far—acres

High severity—of the area so far

Detections3,002satellite fire pixels

Fire milestones

Burn severityHigh, Moderate, Low, Unburned to low, Increased greenness

Burning nowAreas reached in the last half day of satellite passes

Washington, D.C., to scale61 square miles of land, drawn at the fire’s scale

Timing: NASA FIRMS satellite fire detections (2,356 VIIRS and 646 MODIS) inside the final perimeter; each place takes the time of its nearest detection, so the order is satellite-observed but interpolated between passes, roughly every 12 hours. Severity: Monitoring Trends in Burn Severity (USGS, U.S. Forest Service), mapped from Landsat after the fire.

How severely it burned

Burn severity inside the final perimeter, classified from Landsat images taken before and after the fire.

Map of burn severity across the Glass Fire

Burn severity by class
Severity	Share	Acres
Highmost vegetation consumed, soils altered	23%	15,535
Moderatemixed: many trees killed, some survive	31%	20,984
Lowsurface fire, most trees survive	31%	20,916
Unburned to lowislands inside the perimeter, little change	14%	9,593
Increased greennessvegetation greener after the fire than before	1.1%	745
Not mappedcloud, shadow or water in the satellite images	0.3%	197

23% of the area inside the perimeter burned at high severity, about 15,535 acres; 54% burned at moderate or high severity.

Monitoring Trends in Burn Severity (U.S. Geological Survey and USDA Forest Service). Classes come from the change in a Landsat burn index (dNBR) between images before and after the fire; acres are each class’s share of the fire’s mapped area.

Where it burned

Acres inside each county, measured from the satellite-mapped perimeter.

Acres burned by county

Napa County	CA	41,101
Sonoma County	CA	26,917

Other large fires in California in 2020

August Complex1.07 million acres
Scu Lightning Complex405,644 acres
Creek Fire381,529 acres
North Complex316,524 acres
Hennessey Fire314,015 acres
Castle Fire174,347 acres
Slater Fire157,657 acres
Red Salmon Complex147,429 acres

Monitoring Trends in Burn Severity (USGS and U.S. Forest Service). Type recorded: Wildfire.