When does a brush fire start?

A brush fire typically starts when dry vegetation, such as grass or shrubs, ignites due to a spark or flame, which can be caused by natural events like lightning or human activities like campfires or discarded cigarettes. Additionally, conditions such as high temperatures, low humidity, and strong winds can increase the likelihood of ignition and spread. Once a fire begins, it can rapidly consume surrounding plant material, leading to a larger wildfire if not contained.