This paper investigates the use of time series of ALOS/PALSAR-1 and COSMO-SkyMed data for the soil moisture retrieval (m(v)) by means of the SMOSAR algorithm. The application context is the exploitation of m(v) maps at a moderate spatial and temporal resolution for improving flood/drought monitoring at regional scale. The SAR data were acquired over the Capitanata plain in Southern Italy, over which ground campaigns were carried out in 2007, 2010 and 2011. The analysis shows that the m(v) retrieval accuracy is 5%-7% m(3)/m(3) at L- and X band, although the latter is restricted to a use over nearly bare soil only.