Wildfires Are No Longer Going to Sleep at Night and Climate Change Is to Blame

Something fundamental has changed about the way wildfires behave, and it has profound consequences for communities, firefighters, and the environment we all depend on. Fires that once quieted naturally after dark are now burning straight through the night, and a landmark new study reveals why this dangerous shift is accelerating.

Published in Science Advances, the research found that the number of hours in North America when weather conditions favor wildfire activity is 36% higher than it was 50 years ago. California alone now sees approximately 550 more potential burning hours annually compared to the mid-1970s. Parts of Arizona and New Mexico are experiencing as many as 2,000 additional fire-prone hours each year. On top of that, the number of days with dangerous fire weather has jumped by 44%, effectively adding 26 extra fire-prone days to the calendar every year.

For generations, nighttime offered a natural reset. Cooler temperatures and rising humidity allowed flames to slow and sometimes extinguish entirely, giving firefighters a critical window to gain ground. Climate change has eroded that window. Warmer nights mean humidity no longer rebounds the way it once did, and the atmosphere continues pulling moisture from soil, vegetation, and forest debris long after sunset. Dead fuels can take weeks to recover their moisture levels, creating a relentless cycle of dryness that makes forests more vulnerable day after day.

The consequences are not abstract. Night burning fires were central to some of the most devastating recent disasters, including the Lahaina fire in 2023, the Jasper fire in Alberta in 2024, and the Los Angeles fires in 2025. Fighting fires in darkness comes with compounded dangers, as wildlife like bears and mountain lions, frightened and fleeing from the flames, create unpredictable hazards for crews already working in extreme conditions.

According to the National Interagency Fire Center, wildfires across the United States burned an area roughly the size of Massachusetts every single year between 2016 and 2025, more than twice the average destruction seen in the 1980s. Canada’s numbers tell a similar story. The planet is sending a clear message, and the most powerful response any of us can offer is pushing urgently and boldly for clean energy solutions that address the root cause.

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