Wildfires are extremely common. In the United States alone, an average of 72,000 wildfires have been recorded per year since 1983, and satellites detect hundreds of thousands more burning across the globe in any given year. While the raw number of fires hasn’t changed dramatically over recent decades, the fires themselves are burning larger areas, lasting longer, and causing far more damage than they did a generation ago.
How Many Wildfires Happen Each Year
The National Interagency Fire Center has tracked U.S. wildfires since 1983 and documents roughly 72,000 per year on average. That works out to nearly 200 fires igniting every single day across the country. Most are small and quickly contained, but a fraction grow into the massive, destructive blazes that make headlines.
Globally, satellites using infrared imaging detect fire activity across every inhabited continent. Grassland fires in Africa, forest fires in Siberia, and agricultural burns in Southeast Asia all contribute to a baseline of fire activity that never fully stops. Over the past 20 years, the total number of fires per year has stayed fairly constant worldwide, but the amount of land burned has increased as individual fires grow larger.
Most Wildfires Are Started by People
A landmark study published in the Proceedings of the National Academy of Sciences analyzed 1.5 million U.S. wildfires from 1992 to 2012 and found that 84% were started by humans. Lightning accounted for the rest. Human-caused fires include everything from unattended campfires and discarded cigarettes to power line failures and arson.
The distinction matters beyond the numbers. Lightning fires tend to cluster in remote forests during summer thunderstorm season, but human-caused fires break that pattern entirely. They tripled the length of the fire season and dominated 60% of the total U.S. land area, compared to just 8% where lightning fires were more common. Human activity was responsible for roughly 44% of all area burned during that two-decade period, meaning lightning fires, though fewer, tended to be individually larger in the wilderness areas where they struck.
Fires Are Burning More Land Than Before
The clearest trend in wildfire data isn’t more fires. It’s bigger fires. Of the 10 years with the most acreage burned in the U.S., nine have occurred since 2000. The western United States and Southwest show the sharpest increases, with dramatically more land burning in the 2000 to 2014 period compared to 1984 to 1999.
Extreme wildfire activity has more than doubled worldwide over the past two decades. Scientists studying satellite data across a 21-year span found that extreme wildfires have become more frequent, more intense, and larger. Carbon emissions from forest fires increased 60% globally between 2001 and 2023, and emissions from boreal forests in northern Russia, Canada, and Alaska nearly tripled during that period as warmer, drier conditions turned vast stretches of forest into fuel.
Fire Seasons Are Getting Longer
Human activity has added an average of 40 days to the global wildfire season. In tropical grasslands, the effect is even more dramatic: people have effectively extended the fire season by about three months, with most fires now occurring in this human-driven window rather than during traditional dry-season peaks.
U.S. Forest Service scientists looked at 35 years of weather data and found that fire seasons are starting earlier in spring and ending later in autumn. Parts of the western U.S., Mexico, Brazil, and East Africa now have fire seasons more than a month longer than they were 35 years ago. Warmer temperatures dry out vegetation sooner, snowpack melts earlier, and drought conditions persist later into the year, all of which widen the window for fires to ignite and spread.
The Cost in Lives and Property
Wildfire smoke is a far bigger killer than the flames themselves. A causal modeling study published in Science Advances estimated that fine particulate matter from wildfire smoke is responsible for approximately 24,100 deaths per year in the contiguous United States. These aren’t just respiratory deaths. The largest category was neurological disease (about 980 deaths per year), followed by circulatory disease, metabolic conditions, and cancer. Smoke particles are small enough to enter the bloodstream through the lungs and affect virtually every organ system.
Property losses have escalated sharply. The 2017 Northern California wildfires caused an estimated $10 billion in direct property damage. The 2018 California fire season, which included the Camp Fire that destroyed the town of Paradise, topped $12.4 billion. The 2023 Maui wildfires alone accounted for $5.5 billion. Total U.S. fire dollar losses in 2023 reached $23.2 billion across all fire types. These figures capture only direct property damage and don’t include costs like lost business revenue, displacement, infrastructure rebuilding, or long-term health care.
Projections for Coming Decades
A United Nations report cited by the World Meteorological Organization projects that extreme wildfire events will increase up to 14% by 2030, 30% by 2050, and 50% by the end of the century. These projections account for both climate change and land-use change, including the continued expansion of development into fire-prone landscapes.
The combination of hotter temperatures, longer droughts, and more people living in and around wildland areas creates a compounding effect. More homes built in fire-prone zones means more ignition sources, more fuel near structures, and more costly disasters when fires do break out. The fires themselves aren’t just a weather problem or a land management problem. They sit at the intersection of climate, human behavior, and where people choose to live.