Previous studies showed that Normalized Difference Vegetation Index (NDVI) derived from the Visible Infrared Imaging Radiometer Suite (VIIRS) are similar to the NDVI derived from the MODerate-resolution Imaging Spectroradiometer (MODIS) sensors, which are nearing the end of their life spans. As a key input to the Canadian Crop Yield Forecaster (CCYF), a modelling tool used by AAFC and StatCan to generate in-season crop yield reports, it is imperative to find a suitable substitute for MODIS NDVI. During the 2023 growing season, two weekly NDVI composites derived from VIIRS, I-band All Quality Clear Sky (AQCS) and I-band Best Quality Clear Sky (BQCS) were produced by CCRS team in near-real time. Three sets of CCYF inputs were prepared using agroclimatic indices combined with either MODIS NDVI, or AQCS NDVI or BQCS NDVI and were run in parallel before each of the four reporting dates from July to October. The results were further integrated into provincial and nation levels with surveyed harvest area by Census Agriculture Region released in February 2024 by StatCan and compared with the surveyed yields. Out of 14 crops tested, 11 crops achieved best results at national level by VIIRS BQCS, two crops achieved best results by MODIS and only one crop got the best forecast with VIIRS AQCS. The mean absolute forecast errors for all 14 crops with MODIS, BQCS and AQCS were 13%, 11% and 19% respectively. This demonstrates that VIIRS I-Band BQCS NDVI is a suitable substitute for MODIS NDVI in crop yield forecasting.