With nearly half of a lactating cow diet composed of whole-plant corn silage (WPCS), it is important for the forage to be of high quality to achieve maximum milk production. Temperature can be an indication of WPCS quality. Quality can also be reflected in fermentation products. The purpose of this experiment was to determine silage temperature and quality of floury and brown midrib (BMR) WPCS varieties treated with foliar fungicide (FUN). A complete randomized design was used with 4 treatments: floury WPCS with FUN application (FF), floury WPCS without FUN application (FC), BMR WPCS with FUN application (BF), and BMR WPCS without FUN application (BC). FUN (pyraclostrobin, C₁₉H₁₈ClN₃O₄ + metconazole, C₁₇H₂₂ClN₃O; Headline AMP, BASF, Florham Park, NJ) application occurred at vegetative tassel (VT). Upon harvest, WPCS was inoculated (Silo-King; Agri-King, Fulton, IL) and stored in Ag Bags (Ag Bag Systems, St. Nazianz, WI) for 295 d before opening. Temperature of WPCS treatments was recorded every 10 min for 48 h using HOBO temperature loggers (Maxim Integrated, San Jose, CA). WPCS from each treatment was placed into 3 buckets with 3 loggers each. Ambient temperature was recorded using an empty bucket with 3 loggers. Fermentation profile of WPCS samples was analyzed at a commercial laboratory (Dairy One Forage Lab, Ithaca, NY). Data were analyzed using the MIXED procedure of SAS (SAS Institute Inc., Cary, NC). Floury treatments had a lower temperature (23.13 ± 0.03°C), compared with BMR treatments (23.73 ± 0.03°C; P < 0.01) over 48 h. DM concentration was greater for floury treatments (30.33 ± 0.47%) compared with BMR treatments (29.24 ± 0.47%; P = 0.05). Lactic acid concentration was greater for BMR treatments (3.09 ± 0.28%) compared with floury treatments (2.41 ± 0.28%; P < 0.01). In conclusion, increased temperature and DM concentration indicate decreased quality for BMR treatments; however, greater lactic acid concentrations indicate better fermentation compared with floury treatments. The application of FUN neither hindered nor improved silage temperature or fermentation products.