Fire season is expanding in California, with an earlier start to wildfire activity in most of the state. In parts of the northern mountains, the season is now starting more than 10 weeks earlier than it did in the 1990s, a new study shows.

Atmospheric scientists Gavin Madakumbura and Alex Hall, two authors of the study, explain how climate warming has been driving this trend and why the trend is likely to continue.

Over the past three decades, California has seen a trend toward more destructive wildfire seasons, with more land burned, but also an earlier start to fire season. We wanted to find out how much of a role climate change was playing in that shift to an earlier start.

We looked at hundreds of thousands of fire records from 1992 to 2020 and documented when fire season started in each region of the state as temperatures rose and vegetation dried out.

While other research has observed changes in the timing of fire season in the western U.S., we identified........

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