The objective of this study was to evaluate the effect of a homolactic inoculant alone and in combination with a heterolactic inoculant on the fermentation and aerobic stability of high-moisture corn. Four replicate piles of high-moisture corn (68% DM) were either untreated (CON) or treated with 165,000 cfu of homolactic acid producing bacteria/g of fresh material (HI; Purina FI Enhanced) or 600,000 cfu of homo- and heterolactic acid producing bacteria/g of fresh material (HI+LB; Purina SI Buchneri) (Land O’Lakes, Inc., Arden Hills, MN) and ensiled in 7.5 L silos for 30 and 90 d. The data were analyzed as a 3 × 2 factorial arrangement with the main effects of treatment (T) and d of ensiling (D), and their interaction (T × D), using the Fit Model procedure of JMP (SAS Institute Inc., Cary, NC) and differences were reported as significant when P ≤ 0.05 using Tukey’s test. The aerobic stability (hr; T × D; P = 0.02) of HI+LB was greater after 30 (263) and 90 (240) d of ensiling when compared with CON (40 and 54) and HI (97 and 43). After 30 and 90 d of ensiling, yeast counts (log cfu/g; T × D; P < 0.01) were lowest for HI+LB (3.14 and 1.33) when compared with CON (5.31 and 4.55), with ethanol concentration (% DM; T × D; P < 0.01) of HI+LB (0.52) being lower than CON (0.80) after 90 d of ensiling. Lactic acid concentrations after 30 and 90 d varied across treatments, ranging from 0.68 to 1.41% DM (T × D; P < 0.01). Acetic acid (T × D; P < 0.01) and 1,2-propanediol (T × D; P < 0.01) concentrations (% DM) were increased for HI+LB (0.79 and 0.60) when compared with CON (0.16 and 0.02) and HI (0.26 and 0.09). Concentration of propionic acid (% DM; P < 0.01) was greatest for HI+LB (0.23) and lower for CON (0.18) and HI (0.19). High-moisture corn inoculated with HI+LB was more aerobically stable and had fewer yeasts as early as 30 d after ensiling, with the concentration of ethanol being lower at 90 d of ensiling when compared with CON.