Prosecutors on Tuesday filed felony charges against the men, which can carry a five-year prison term.
All three were arrested last week, and it's unclear whether they have attorneys.
Prosecutors say the men made a campfire during dangerous Santa Ana conditions, and a gust of wind caught papers they threw onto the blaze. The embers set brush alight in the Angeles National Forest foothills above Glendora northeast of Los Angeles.
The resulting wildfire destroyed five homes and damaged 17. It also injured six people and forced several thousand from their homes.
The nearly 2,000-acre fire is 95 percent contained Tuesday.
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