Kikuyu grass is the predominately forage in highlands dairy systems in Colombia, but there is lack of knowledge of the productivity and nutritional quality related to age of regrowth and pasture harvest season to optimize its utilization. The objective of this study was to characterize the dynamic growth of kikuyu grass in dairy farms during 2 seasons (rainfall, drought). Two farms were selected and descriptive longitudinal growth studies were performed during the rainy season (average rainfall 126.76 mm/month, 80 d) and drought (average rainfall 22.42 mm/month, 120 d), in plots of 160 m2, divided into 10 strips. Weekly evaluations were performed from d 7 to 70 of regrowth. Forage yield per unit area was quantified, morphometric variables were measured and 500 g of green herbage were collected for laboratory analysis of crude protein (CP), neutral detergent fiber (NDF), and acid detergent fiber (ADF). No differences were observed between farms. The observed growth, both for the rainy season and the dry season, corresponded to a sigmoidal shape, where the best fit was achieved through the logistic model. From the parameterization of the model, it was estimated that the maximum rate of dry matter yield and the optimum grazing time for the rainy season was 219 kg DM/ha/d at 46 d of regrowth and for drought season was 122 kg DM/ha at 35 d of regrowth. Dried forage production at 70 d of regrowth during the rainy and drought season were 10.8 and 6.6 t/DM/ha, respectively. Plant height at 70 d of regrowth was 66.5 and 47.3 cm for rainy season and dry season, respectively. The CP concentration in the rainy season showed an increasing until d 21 of regrowth, with a maximum of 24.5%, then decreasing linearly until d 70 (16.2% CP). In dry season, the CP recorded a peak at 28 d of regrowth with 25.3%, decreasing the value to 23.9% at d 70. The NDF content showed a linear behavior in the 2 seasons, from 50.8% to 58.3% in rainfall and 47.4 to 51.9% in drought. From the results obtained, it is possible to estimate that the rotation time, which obtains the highest annual milk production according to the quality and availability of herbage, is around 28 d of regrowth.