Abstract: The objective of this study was to determine the phenological stages and viability, germination capability of pollen grains in vitro and fertility level of Érdi bõtermõ, Debreceni bõtermõ, Kántorjánosi, Újfehértói fürtös, Éva, Petri, Oblacsinszka, Pándy279 and Csengõdi sour cherry (Prunus avium L.) cultivars grown in Hungary. It was determined that active pollen levels significantly varied between 12.4 and 93.7% in TTC (2, 3, 5-triphenyl-tetrazolium-chloride) tests. Anther of Kántorjánosi showed the highest (148) number of pollens, whereas the lowest number (27 was obtained from Oblacsinszka. The highest germination was obtained from Oblacsinszka by 64.5% and the lowest obtained by Pándy 279 on 28.8% after 48 h. In orchard trials the mean fruit set of self-pollination were 6.3% with max. 18.6% in the case of Oblacsinszka and min. 0% in the case of Pandy279, while in open pollination trials it was 15.2% max. 28.5% in Oblacsinszka and min. of 7.5% in Pándy279.