A tri-fold row marker comprises three arm segments, a winglet pivotally coupled to the toolbar, an inner arm pivotally coupled to the winglet, and an outer arm pivotally coupled to the inner arm. A marker disc is mounted to the distal end of the outer arm for marking the ground surface when said row marker is its extended working position. The winglet is provided with a first bell crank extending upwardly from the winglet and a second bell crank extending downwardly from the winglet. The inner arm is provided with a third bell crank extending downwardly therefrom. A double acting hydraulic cylinder is pivotally coupled to the agricultural implement and the first bell crank for retracting and extending the row marker. An inner control arm is pivotally coupled to the agricultural implement and the third bell crank for pivoting the inner arm relative to the winglet when the hydraulic cylinder is extended or retracted. An outer control arm is pivotally coupled to the second bell crank. The outer control arm is also coupled to the inner and outer arms by two pivot links that are pivotally coupled to the outer control arm and the inner and outer arms. The outer control arm pivots the outer arm relative to the inner arm when the hydraulic cylinder is extended or retracted. Retracting the hydraulic cylinder from its extended position folds the marker arm into its retracted transport position, and extending the hydraulic cylinder from its retracted position unfolds the marker arm into its extended working position.