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A field experiment was conducted at Kef research station (INRAT) located in a semi-arid zone in north-western of Tunisia to study the effect of two sowing dates (27 November 2014 and 7 February 2015) on phenology, growth and yield components of nineteen lentil lines. Our results showed that the different lines responded differently to different sowing dates. As sowing was replayed from November to February, numbers of days until flowering (NDF) and numbers of days until maturity (NDM) were decreased by 41%(78.3 vs. 133.4 days) and by 29.2%(171.8 vs. 121.7 days) respectively. On the other hand, the delay in sowing of lentil lines from November to February reduced the plant height (PH), the biological yield per plant (BYPP), the number of productive branches per plant (NPBPP), the pods number per plant (PNPP) and grain yield/ha (GY/ha) by 28%, 21%, 46%, 45% and 66% respectively. It is important to note that some lentil lines (line4 and line8) produce more grain yield under later sowing date comparatively to early sowing date. These lentil lines need more attention and can be incorporated in lentil breeding programme for the development of short stage varieties.