The paper presents the analysis concerning 14 years lasting Silver fir (Abies alba Mill.) phenological observations in altitude of 500 – 940 m a. s. l. in Slovakia. During the years 1996 – 2009 the start of a vegetative phenological stage May first shoots and generative phenological stages as the beginning of flowering, full flowering and the first ripened fruits were monitored at 13 phenological stations. May shoots occurred from 10. 05. till 24. 05., the beginning of floweringlasted on average from 08. 05. till 28. 05. The full flowering took place on average from 14. 05. to 03. 06. The first ripened fruits were recorded on average from 12. 09. till 23. 09. The analysis of spring phenological stages pointed out their dependence on the mean two-months temperature in April and May. The beginning of observed spring pheno-stage within the mentioned altitudinal interval of 440 m was late by 9 – 14 days. The gradual beginning of a crop ripening in relation to the increasing altitude has not been observed during the autumnal pheno-stage, at all. Trends of all phenological stages shift in the earlier period by 5 – 8 days. The autumnal pheno-stage of the first ripened fruits is delayed by 2 days.