Antioxidant properties were analyzed in ethanol extracts of yellow marigold flowers. The preliminary screening of marigold flowers contain phytochemicals. These phytochemicals are able to reduce the oxidative stress in living organisms under adverse conditions. The major phytochemicals antioxidants in marigold petal extracts were reported to be phenolics and carotenoids. The petals of marigold flower was evaluated for antioxidant properties in vitro using Diphenyl-1-picrylhydrazyl (DPPH), free radical scavenging activity, total phenolic content and total flavonoid contents. The objective of this study to determined the antioxidant properties of petals of marigold flowers