An analysis of radar signal sensitivity to crop and soil conditions was conducted using a time series of Sentinel-1 C-band dual-polarized (VH-VV) SAR images acquired from October 2014 to September 2016 for different crops (meadows, pasture, orchard, vineyards) located in mountain areas. Together with Sentinel-1 images, corresponding Sentinel-2 images and ground measurements were exploited. Preliminary results showed that the cross-polarized VH backscattering coefficients were useful for monitoring crop phenology. In particularly for meadows the VH signal is well correlated with NDVI derived from both Sentinel-2 images and from ground observations.