Forest Health & Management

From 2012-2015 California faced the worst epidemic of tree mortality in modern history. Multiple years of drought, combined with an infestation of native bark beetles, contributed to the death of millions of trees on federal, state, and private lands across California. 

This viewer was brought to you by the Tree Mortality Task Force (TMTF), which was coordinated by the California Governors office between 2015 and 2018. The TMTF was comprised of multiple agencies, entities and stakeholders working together to address the Tree Mortality crisis. This viewer includes various layers related to the tree mortality problem, including Aerial Detection Survey data (depicting areas of dead trees), High Hazard Zones, tree removal projects, and others.

The California Department of Forestry and Fire Protection's Fire and Resource Assessment Program (FRAP) annually maintains and distributes an historical wildland fire perimeter dataset from across public and private lands in California. The GIS data is developed with the cooperation of the United States Forest Service Region 5, the Bureau of Land Management, California State Parks, National Park Service and the United States Fish and Wildlife Service and is released in the spring with added data from the previous calendar year. Although the dataset represents the most complete digital record of fire perimeters in California, it is still incomplete, and users should be cautious when drawing conclusions based on the data.  

This data should be used carefully for statistical analysis and reporting due to missing perimeters (see Use Limitation in metadata). Some fires are missing because historical records were lost or damaged, were too small for the minimum cutoffs, had inadequate documentation or have not yet been incorporated into the database. Other errors with the fire perimeter database include duplicate fires and over-generalization. Additionally, over-generalization, particularly with large old fires, may show unburned "islands" within the final perimeter as burned. Users of the fire perimeter database must exercise caution in application of the data. Careful use of the fire perimeter database will prevent users from drawing inaccurate or erroneous conclusions from the data. This data is updated annually in the spring with fire perimeters from the previous fire season. This dataset may differ in California compared to that available from the National Interagency Fire Center (NIFC) due to different requirements between the two datasets. The data covers fires back to 1878.  As of May 2026, it represents firep25_1. 

Please help improve this dataset by filling out this survey with feedback:

Historical Fire Perimeter Dataset Feedback

Current criteria for data collection are as follows:

CAL FIRE (including contract counties) submit perimeters ≥10 acres in timber, ≥50 acres in brush, or ≥300 acres in grass, and/or ≥3 impacted residential or commercial structures, and/or caused ≥1 fatality.

All cooperating agencies submit perimeters ≥10 acres.

 Version update:

Firep25_1 was released in April 2026. Five hundred sixteen fires from the 2025 fire season were added to the database (42 from BLM, 264 from CAL FIRE, 65 from Contract Counties, 62 from Local Responsibility Area, 7 from NPS, 68 from USFS and 7 from USFW). Eleven fires were added from 2016–2024, not previously published. One duplicate record was removed (1984 HURRICANE). One perimeter was identified as a controlled burn and moved to the rxburn25_1 dataset (1987 PEPPERTREE CONTROLLED). Five perimeters were replaced with more accurate geometry. A count of 12,097 fires' collection methods were edited from Null values to Unknown. Another 78 records had attributes updated.

A new field, Global ID, was added to provide a unique ID to track all fire records in this dataset including those pre-dating IRWIN IDs.

The following fires were identified as meeting our collection criteria but are not included in this version and will hopefully be added in a future update: Tule (2025-CATIA-000654).

Includes separate layers filtered by criteria as follows:

California Fire Perimeters (All): Unfiltered. The entire collection of wildfire perimeters in the database.  It is scale dependent and starts displaying at the country level scale. 

Recent Large Fire Perimeters (≥5000 acres): Filtered for wildfires greater or equal to 5,000 acres for the last 5 years of fires (2021–2025), symbolized with color by year and is scale dependent and starts displaying at the country level scale. Year-only labels for recent large fires.

California Fire Perimeters (1950+):  Filtered for wildfires that started in 1950–2025.  Symbolized by decade, and display starting at country level scale.

Detailed metadata is included in the following document:

Wildland Fire Perimeters Metadata

See more information on our Living Atlas data release here:

 CAL FIRE Historical Fire Perimeters Available in ArcGIS Living Atlas

For any questions, please contact the data steward:

Kim Wallin, GIS Specialist

CAL FIRE, Fire & Resource Assessment Program (FRAP)

kimberly.wallin@fire.ca.gov