We determined the summed activity of oxidases, catalases and reducing substances of the extracts from the English oak buds, pubescent oak and sessile oak, sampling in autumn, winter and spring from trees growing nearby. In the extracts from the oak tree buds, there were clearly different trends in antioxidant activity during the transit period from one season to another. Due to the specific activity of antioxidant substances in buds, the pubescent oak falls earlier in autumn rest and comes out of dormancy, in spring, later. Exceptional antioxidant processes take place in the buds of the sessile oak, as a result of which, this species enters dormancy later in autumn and, in spring, comes out of it early. Catalase activity from buds under winter conditions may serve as an indicator of low-temperature species resistance. In this aspect, the pubescent oak, compared to the English oak and the sessile oak, is the species less adapted to winter conditions.