California Wildfire Climate Risk Assessment - TWOCLICKS Climate Intelligence

Executive Summary

Region

California, USA

Primary Hazard

Wildfire

Risk Rating

CRITICAL

California faces the highest wildfire exposure of any U.S. state. The January 2025 Los Angeles firestorm — the Palisades and Eaton fires — killed at least 31 people, destroyed more than 18,000 structures, and forced over 200,000 residents to evacuate, ranking among the costliest wildfire disasters in U.S. history.

This is not an anomaly. The 2020 season alone burned more than 4.2 million acres — over 4% of the state’s land — and produced the August Complex, the first single fire in California history to exceed one million acres. The following year, the Dixie Fire burned 963,309 acres and became the most expensive wildfire to suppress in U.S. history.

Bottom line: wildfire is a structural, year-round risk in California that materially affects property, insurance availability, power reliability, air quality, and operational continuity. Any siting, investment, or continuity plan in the state must treat it as a primary hazard.

Risk Assessment Overview

WildfireCRITICAL
Highest exposure of any U.S. state

Smoke / Air Quality

HIGH

Regional smoke events each fire season

Power Shutoff (PSPS)

HIGH

Utility de-energization in wind events

Primary Risk Factor: The combination of Santa Ana / Diablo wind events, an expanding wildland-urban interface, and longer dry seasons has made destructive wildfire a year-round threat rather than a seasonal one — as the January 2025 Los Angeles fires demonstrated.

Recent Catastrophic Event: January 2025 Los Angeles Firestorm

On January 7, 2025, multiple wind-driven fires ignited across Los Angeles County during an extreme Santa Ana wind event. The two largest — the Palisades Fire and the Eaton Fire — became among the most destructive in California history. Both were fully contained on January 31, 2025.

Total Lives Lost

31 people

Across the January 2025 fires

Structures Destroyed

18,000+

Homes and buildings

Residents Evacuated

200,000+

Los Angeles County

Total Acres Burned

57,529 acres

January 2025 SoCal fires

Fire	Acres	Fatalities	Structures Destroyed	Distinction
Eaton Fire	—	19	9,000+	2nd most destructive in CA history
Palisades Fire	23,448	12	6,837	Among most destructive in CA history

Source: CAL FIRE incident archives (Palisades Fire, Eaton Fire), January 2025. Combined totals per CAL FIRE reporting on the January 2025 Southern California wildfires. Eaton Fire final acreage not individually reproduced here to avoid an unverified figure.

Why it matters: Both fires occurred in January — outside the traditional summer–fall fire season — driven by extreme winds and dry fuels. This underscores that California’s wildfire risk is now effectively year-round.

California’s Wildfire Record

California’s largest and deadliest wildfires on record illustrate the scale of the hazard. The 2020 season was the largest in the state’s modern history, with nearly 10,000 fires burning more than 4.2 million acres — over 4% of California’s roughly 100 million acres of land.

Largest and Most Significant Wildfires

Fire	Year	Acres Burned	Distinction
August Complex	2020	1,032,648	Largest in CA history; first “gigafire” (>1M acres)
Dixie Fire	2021	963,309	2nd largest; most expensive U.S. wildfire to suppress ($637.4M)
Camp Fire	2018	153,336	Deadliest & most destructive — 85 deaths, 18,000+ structures

Source: CAL FIRE incident archives and CAL FIRE statistics.

2020 Season — Acres Burned

4.2M+

Over 4% of California’s land area

2020 Season — Fire Count

~10,000 fires

Largest season in modern state history

Camp Fire (2018): The deadliest and most destructive wildfire in California history destroyed the town of Paradise, killing 85 people and destroying more than 18,000 structures across 153,336 acres — most of the destruction occurring within the first four hours.

Why California’s Wildfire Risk Is So High

California’s wildfire exposure is driven by a convergence of geographic, climatic, and human factors:

Santa Ana & Diablo winds: Seasonal offshore winds drive explosive fire spread and were the proximate driver of the January 2025 Los Angeles firestorm.
Wildland-urban interface (WUI): A large and growing share of California housing sits in the WUI, placing communities directly in fire-prone terrain.
Drought and fuel loads: Recurrent drought across the American West dries vegetation and elevates available fuel, lengthening the window in which fires can spread rapidly.
Longer fire seasons: Destructive fires now occur outside the traditional summer–fall window, as the January 2025 fires demonstrated.

Operational Implications

Insurance: Major insurers have reduced or paused new homeowner policies in high-risk California zones; coverage availability and cost are material planning factors.
Power reliability: Utilities implement Public Safety Power Shutoffs (PSPS) during high-wind events, creating planned outages for facilities and residents.
Air quality: Smoke events degrade regional air quality for days to weeks; HVAC filtration and worker-protection protocols are recommended.
Business continuity: Evacuation orders, road closures, and infrastructure damage can interrupt operations with little notice.

Data Sources

CAL FIRE — Incident Archives & Statistics
NIFC — National Interagency Fire Center
NASA FIRMS — Active Fire Data
NOAA National Weather Service
U.S. Drought Monitor (USDM)

Disclaimer

This report compiles historical wildfire and climate data from official government sources for informational purposes only. It is not a substitute for professional engineering assessment, environmental impact studies, insurance underwriting, or regulatory compliance review.

Figures reflect official records as reported by the cited agencies and do not constitute a prediction of future conditions. Users should conduct independent due diligence appropriate to their specific use case and risk tolerance.

This is a sample report illustrating the structure of a TWOCLICKS climate risk assessment. All figures are real and drawn from the cited government sources.