Anthropogenic warming drives earlier wildfire season onset in California.

A decreasing trend in onset over developed land can be seen in 11 of 13 ecoregions.

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All ecoregions except the Sonoran Basin and Range show a negative trend in fire onset (i.e., fire onset date trends earlier).

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The tree land cover type in the Central Basin and Range, where 9% of that ecoregion’s fires originate, also experienced a nonsignificant trend toward later fire onset.

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