This invention is a new and distinct grapevine variety denominated ‘IFG Thirty-six’. The new grapevine is characterized by producing naturally large seedless black berries having a broad ellipsoidal shape with a strong spicy concord-like labrusca flavor. Fruits are medium in acidity, with a firm texture and have excellent eating quality. Berries color readily even in hot climatic conditions and produce completely colored black berries. Vines are productive and can be pruned to short spurs.