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This study aims to evaluate how age, harvesting seasons, and culm height affect the properties of various bamboo species. The properties of bamboo fibres for composite development in Ethiopia have not been investigated so far. In this study, the properties of <i>Y. alpina</i> and <i>B. oldhamii</i> were scientifically investigated for bamboo culm structural applications and bamboo fibre composite development based on age and the harvesting season. <i>Y. alpina</i> was collected at Injibara and Mekaneselam which are located in east Gojjam and south wollo, whereas <i>B. oldhamii</i> was collected at Kombolcha which is located in south Wollo, Ethiopia. Three representatives of bamboo plants were collected in the three regions, namely from three age groups, across two harvesting months. The highest and lowest moisture content and shrinkage were measured at the ages of one year and three years, respectively, whereas basic densities were measured at the ages of three years and one year. The harvest month of November yields higher moisture content and shrinkage but lower basic densities compared to February. <i>Yushania alpina</i> has a higher moisture content and shrinkage but lower basic densities compared to <i>Bamusa oldhamii</i>. The current research demonstrates that the three-year-old groups and the harvesting month of February produce yields more suited for construction and structural purposes due to the ensuing good dimensional stability after drying. From the highest to the lowest percentage of the degree of crystallinity of the yield, it is that derived from Inj., followed by Meka., and then Kombolcha, respectively. Bamboo fibres have high powder crystals and degradation temperatures which make them suitable for composite development at two year old. <i>Yushania alpina</i> has a higher degree of crystallinity and degradation temperature of cellulose compared to <i>Bambusa oldhamii</i>.