In order to produce products based on composites, researchers have recently made a significant effort to find environmentally safe and biodegradable reinforcements. The increasing usage of biomaterials in recent times has significantly reduced carbon footprints and greenhouse gas emissions. As a result, the use of natural fiber reinforcement in polymer matrices is highly recommended due to its exceptional ability to balance processing convenience and performance with cost. The low fire resistance and delayed flammability behavior of these materials, limit the application of natural fiber composite for different potential applications. Consequently, it follows that in order to create natural composite with improved thermal degradation, biodegradation, and fire resistance, it is critical to comprehend the flammability and degradation of natural composite as well as the testing procedures used to evaluate them. Hence, in this review, we will present the detailed analysis of fire performance of phenolic and PLA based reinforced polymer composite. In particular, UL-94 horizontal and vertical flammability tests and cone calorimetric analysis was presented the utmost dominant methods for evaluating the fire performance behavior of the natural fiber-reinforced composites.