Firefighter 1 State Practice Test 2026 – Comprehensive Exam Prep

The second phase of fire is the Growth Phase. During this stage, the fire begins to spread and intensify after the initial incipient phase, where the fire has just started. In the Growth Phase, the flames can increase in size and the heat production rises significantly. This phase is characterized by the development of larger flames as the fire consumes available fuels, and it can produce smoke and toxic gases.

As the fire grows, it may potentially spread to other materials, leading to an even larger fire if not controlled. Understanding this phase is crucial for firefighters, as effective intervention during this stage can prevent the fire from reaching the fully developed phase, which is more challenging to combat. The Growth Phase often provides the best opportunity for firefighters to mitigate the fire before it becomes uncontrollable.