The objective of the present study was to determine the aerobic stability and in situ ruminal dry matter degradation of the silage of savoy grass including increasing levels of passion fruit residue (10, 20, 30, and 40% on fresh basis) in the silage of 45-d-old savoy grass. The silage of the chopped and homogenized products was carried out in experimental microsilage (5 replications per treatment). The data for aerobic stability and ruminal degradability were analyzed with the GLM procedure using the treatment as a fixed effect, and the least squares means were compared with the Tukey test. When the effect studied was time, the linear trend was investigated by orthogonal polynomial contrasts. Additionally, the Dunnet test was carried out, using as a reference the value at 0 h, when the linear effect was significant. Statistical significance was set at P < 0.05. After 21 d, the microsilages were opened and the aerobic stability temperature (T) and pH for 6 d and the in situ degradation of the dry matter (DM) at 0; 3; 6; 12; 24; 48 and 72 h (h) were determined. The combination between 10 and 40% of passion fruit residue fresh weight with savoy grass did not have important effects on aerobic stability and ruminal degradation. In all the treatments, a low aerobic stability was observed with an increase in T higher than 1°C at 6 d and more than 0.5 pH units after 2 d. The ruminal degradation of the DM was higher (P < 0.05) in silages that included 30 and 40% of passion fruit residue, which would indicate a higher nutritional value. Savoy grass silage with passion fruit residue could be an efficient and environmentally acceptable way to dispose of food to sustain the productivity of bovine herds during the dry season. However, the high aerobic instability must be taken into account when handling silage to avoid material and nutrient losses.