No, but it contributes to their size, length and intensity.
Wildfires are overwhelmingly ignited by people. 85 percent of the time, fires are started by people through burning debris, unattended campfires, discarded cigarettes, use and malfunction of equipment and arson. A smaller number of fires are naturally occurring, started most often by lightning. While naturally occurring fires burn more acreage (56%), human-started wildfires spread faster, burn hotter and destroy more trees.
But, climate change contributes to wildfire size and intensity. Rising temperatures (both daytime and nighttime) and changes to precipitation create more fuel for fires and conditions that allow fires to grow larger, last longer and become more intense.