The fire season starts as early as March in the southeastern United States, and by April, fires pop up in the Southwest.
The investigation into the cause of the fire has been completed, but an outside probe is being conducted to vet the results before release.
That number of at-risk Coloradans soared 45 percent in just five years, from 2 million to nearly 3 million.
The Ryan Fire exploded over the weekend, growing from 3,000 acres on Friday to 19,000. The fire is burning mostly in Wyoming.
Jesper Joergensen, a Denmark native, told police that he started a fire to burn trash, and then that he was grilling in a fire pit.
Record-breaking heat last week and over the weekend hasn't helped firefighters battling wildfires across the state.
Hot weather and wind caused the Silver Creek Fire to flare up Wednesday evening, growing at least 1,000 acres.
Hot and dry weather with windy conditions helped make this the worst fire season in Colorado since 2002.
The lawsuit was filed before the Forest Service has completed its own official investigation into the fire's cause. It claims that train management was “careless."
A study from the University of Idaho found that wildland firefighters are fatigued and have delayed reaction times, which may be a result of not getting enough sleep. The study leaves more questions than answers.