Until October, 2007, there had never been a wildfire recorded in the canyon (where homes are) since records have been kept, though it was named as Southern California's highest risk area for wildfires. On October 26, 2007, the Orange County Fire Authority issued a mandatory evacuation of the area due to the Santiago Fire. Silverado has been a problem area for rockslides as well.
In 2004, a teenage girl was killed in her home, which was part of the Shadybrook Market, when a massive boulder broke loose during heavy rains and rolled through her bedroom. Danny Johnson, a resident of Silverado, was the last person to take a photo of the intact Shadybrook Market. It was the day of the fatal boulder crash, and was taken for a school project.
Today new homes and developments from nearby urban areas are encroaching on the canyons. The largest proposed projects are by The Irvine Company, which plans to build two developments stretching along Santiago Canyon Road from Jamboree Road past Irvine Lake. The first, situated on both sides of the 241 toll road, will consist of 1,746 homes on . The second development, overlooking Irvine Lake, will add 2,400 more homes on 1,000 acres (4 km²).