Objective: The aim of this research was to determine the effect of different growth stages on forage yield and some quality properties of blue melilot (Melilotus caeruleus (L.) Desr.). Material and Methods: This study was carried out in 2016-2018 on the farm land of Hasanaga village in Edirne, Turkey. The experiment was laid out in randomized complete parcel design with three replicates. Line was sown in plots of 8 rows, with a spacing of 20 cm and 5 m in length. The seeds were sown at a rate of 30 kg ha-1 on October 21, 2016 and October 25, 2017. At each year, a basal fertilizer containing N (45 kg ha-1) and P (52.5 kg ha-1) was incorporated into the soil at the time of land preparation. The some morphological characters (plant height, number of leaves per plant, leaf length, leaflet length, leaflet width, and leaf/stem ratio), green fodder yield, dry matter yield and some quality traits (crude protein ratio, acid detergent fiber and neutral detergent fiber ratios) were determined at budding , 50 % bloom and fruit development stages. Results: The plant height, number of leaves per plant, leaf/stem ratio, green fodder yield, dry matter yield, crude protein ratio, acid detergent fiber and neutral detergent fiber ratios were affected by growth stages. In Leaf length, leaflet length and width, not differences were found between different growth stages. Conclusion: Differences were determined between the growth stages in the blue melilot for forage yield and some forage quality properties. Green fodder and dry matter yields at fruit development stage was obtained to be higher than other growth stages.