Haypress Fire

2021204,379 acresCalifornia

The Haypress Fire burned 204,379 acres, about 319 square miles, across 2 counties. It began on July 31, 2021.

Watch how it happened

Haypress Fire · 2021

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

Detections24,674satellite fire pixels

Fire milestones

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

Burning nowAreas reached in the last half day of satellite passes

Chicago, to scale228 square miles of land, drawn at the fire’s scale

Timing: NASA FIRMS satellite fire detections (20,221 VIIRS and 4,453 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 Haypress Fire

Burn severity by class
Severity	Share	Acres
Highmost vegetation consumed, soils altered	21%	42,684
Moderatemixed: many trees killed, some survive	26%	53,162
Lowsurface fire, most trees survive	38%	76,770
Unburned to lowislands inside the perimeter, little change	15%	31,473
Not mappedcloud, shadow or water in the satellite images	0.1%	197

21% of the area inside the perimeter burned at high severity, about 42,684 acres; 47% 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

Trinity County	CA	106,973
Siskiyou County	CA	97,569

Other large fires in California in 2021

Dixie Fire979,722 acres
Caldor Fire226,739 acres
Monument Fire225,973 acres
Antelope Fire141,890 acres
Mcfarland Fire121,476 acres
Sugar Fire108,479 acres
Windy Fire97,802 acres
Mccash Fire95,698 acres

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