The climate on Oat Mountain varies from season to season. During the start of the year in January, occasional rain showers and thunderstorms may pass over the mountain. Cold storms produce light snow on the peaks of the mountain, when the snow level drops under 4,000 feet. Going into spring the weather may change. Some years it may be very dry on the mountain causing a lack of vegetation. In other years though the springtime could bring heavy storms with upwards of 4" of rain and some snow. The summer has dry periods and occasional thunderstorms from the floors of the San Fernando Valley and Santa Clarita Valley. This may bring flash flooding and debris flows from burn scars in the area. Fall is typically dry and sunny but Santa Ana Winds can cause small wildfires to start on the mountain.
Wildlife in the area is very sparse in summer months. Oat Mountain has typically the same type of flora and fauna found elsewhere in the Mountain range. Mountain lions are particularly common in the region and can be seen almost all year round along with birds like the turkey vulture and the Canada goose. Vegetation is not very diverse on the mountain. The mountain is usually covered in brown grass and oats in the summer but during heavy periods of rain the mountain is usually green and contains more wildlife.
Human interference
Oat Mountain has had many major problems in modern times starting in 1971 with the construction of two missile sites called "The Nike Missile Test Site". Since then it was heavily contaminated and debris and abandoned buildings litter that area. In 2015, a story made headlines when a gas leak was reported at one of the seven oil fields littering the natural areas of the mountain. The Aliso Canyon Oil Field was involved in this situation. Many people reported nose bleeds, strong headaches, and other symptoms. That same year the oil field was shut down and taken to court. As of August 2017, the oil field is scheduled to reopen but may be taken to the cityregional court in Los Angeles or to the federal court in Sacramento.
Hiking and destinations
Oat Mountain has many hiking trails and scenic destinations. One of the main hiking trails ascends the San Fernando Valley side of the mountain and has four different connecting trails. One of these leads to the Nike Missile Site with abandoned buildings, vehicles, and rubble surrounding it. One expert route up the mountain follows the backbone of the mountain in Santa Clarita but is difficult because it is forested. The last trail is a 16-mile hike between Rocky Peak and Oat Mountain.
