This study compared the accuracy of 3 handheld near infrared spectrophotometer (NIRS) units (Digi-Star Moisture Tracker, Fort Atkinson, WI) and 2 on-farm testing methods for predicting DM to conventional oven drying at 60°C of corn silage. Corn silage samples (1,500 g) were obtained from 4 commercial farms in Kansas and analyzed for DM daily for 20 d. Two calibrations were also tested within each unit: NIRu was the DM predicted from the factory-preset calibration, and NIRc was a bias-adjusted DM prediction based on the average difference oven-dried corn silage and NIRu over the 20-d experiment. The NIRc was determined after the experiment was completed. Each sample was scanned 20 times by each NIRS unit and the average predicted DM was recorded as the DM. This process was replicated 3 times with each NIRS unit. Two duplicate 100-g subsamples were dried by 3 different methods: food dehydrator at 71°C (Nesco, Two Rivers, WI), 71, Koster Tester (Koster Moisture Tester Inc., Brunswick, OH), and 60°C oven. The 60°C oven samples were dried for 48 h and then dried in a 105°C oven for 24 h to obtain the final DM daily. Data were analyzed using PROC MIXED (SAS, version 9.4), with method, method × farm, and method × day as fixed effects and equipment as a random effect. Average Oven DM of corn silage was 36.21% for the 20-d experiment. The 3 NIRu predictions of 35.87 ± 0.5957, 32.43 ± 0.5957, and 32.97% ± 0.5957 were significantly different from the corn silage oven value of 36.21% DM (P < 0.05). While all 3 NIRc predictions of 36.20 ± 0.7407, 36.25 ± 0.7407, and 36.20% ± 0.7407 were similar to oven DM value of 36.21% for corn silage (P > 0.05). The DM predictions for the food dehydrator and Koster Tester of 38.73 ± 0.7407 and 38.22% ± 0.7407 respectively, were significantly different from oven-dried DM for corn silage (P < 0.05). The handheld NIRS units accurately predicted DM content of the corn silages when the factory preset calibrations were corrected for bias, while the food dehydrator and Koster Tester overestimated the DM of the corn silage.