Warm-season annual forages are highly digestible and commonly used to complement perennial grass pastures during the summer. This study evaluated in vitro and in situ di-gestibility and digestion kinetics of mixtures composed of crabgrass (Digitaria sanguinalis [L.] Scop.) and pearl millet (Pennisetum glaucum [L.] R. Br.) grown alone (G) or combined with 30% forage soybean (Glycine max (L.) Merr.) (G+L) across the growing season. Digest-ibility was assessed through in vitro true digestibility (IVTD) and in situ ruminal incuba-tion. A treatment × month interaction (P < 0.01) affected IVTD, with both treatments de-clining from July to September and no differences between G and G+L across months. A treatment × incubation time interaction (P < 0.01) was also detected. The G mixture reached a digestion plateau between 48 and 72 h, whereas G+L did not stabilize during the evalu-ated period, with differences between treatments observed only at 72 h, when G+L showed greater in vitro digestibility. In situ analysis showed that G had a greater disappearance fraction (D₀), whereas G+L had a greater indigestible fraction (U) throughout the season. The inclusion of 30% forage soybean did not improve overall digestibility, indicating that this strategy alone is insufficient to offset forage maturation effects.