This study aimed to investigate the chemical composition, rumen degradation characteristics and feeding value of Chanhluong grass – a drought-tolerant grass at three harvest times as ruminant feed, including pre-flowering, flowering and post-flowering stages. The gas production technique was used for the estimation of the degradation of dry matter (DM), organic matter (OM) and metabolic energy (ME). The nylon bag method was used to investigate the degradability of DM and OM. The feeding values were evaluated. Results showed that the DM and neutral detergent fiber (NDF) content of the pre-flowering stage (39.57 and 68.50%) were lower than flowering stage (40.38 and 70.14%) and post-flowering stage (45.23 and 71.66%) (P<0.001). The crude protein (CP) content of the pre-flowering stage (6.57%) was higher, (6.04%) and higher than the post-flowering stage (5.04%) (P<0.001). The ADF content of pre-flowering (40.34%) and flowering stages (41.36%) was similar and lower than that of the post-flowering stage (43.78%). The estimated ME decreased by stages (pre-flowering > flowering > post-flowering stage), and this difference was statistically significant (P = 0.001). The grass's rumen DM and OM degradation at the pre-flowering stage was significantly (P<0.05) higher than the flowering and post-flowering stage. The comprehensive analysis of our current study showed that Chanhluong grass at the pre-flowering stage had the highest ruminal degradability and feeding value, therefore, a promising alternative to utilise for ruminant feeding, especially in arid regions.