A factorial design was used to ascertain the vegetative and reproductive responses of thirty Cajanus cajan (L.) Millsp. accessions to three sowing dates. Data for the number of days to 50% flowering and the plant heights at that stage are presented herein. Preflowering durations and plant heights varied between planting dates and accessions. The interaction between plant height and sowing date was significant, but negligible variation occurred in the temperature and the daylength at 50% flowering. Data did not facilitate delineation of the relative photoperiodic sensitivity of the accessions but facilitated classification based on the average preflowering phase over the three planting dates.