A field experiment was conducted on loamy sand soil during rabi season of 2011-12 and 2012-13 to find out the response of three weather variables (15^th September, 30^th September and 15^th October) and three crop geometry (150 cm x 60 cm, 120 cm x 60 cm and 90 cm x 60 cm) with two levels of nitrogen (80 kg and 120 kg ha^-1) on growth, yield attributes and yield of castor (Ricinus communis L.). In general, growth and yield attributes decreased with delay in sowing from 15^th September to 30^th October. The growth characters viz., plant height, number of branches per plant and numbers of nodes up to primary spike as well as yield attributing parameters viz., length of primary spike, number of capsules per primary spike, number of effective spikes per plant, seed yield per primary spike and per plant as well as seed yield of first and second pickings were significantly higher under early sown crop i.e. 15^th September than late sown crop i.e. 15^th October. The growth parameters viz., plant height and number of nodes up to primary spikes was significantly higher under crop geometry 90 cm x 60 cm than 150 cm x 60 cm crop geometry. While, number of branches per plant was the significantly maximum under crop geometry at 150 cm x 60 cm.  Significantly the higher values of yield attributes were recorded under crop geometry of 150 cm x 60 cm as compared to crop geometry of 90 cm x 60 cm. Both the wider crop geometry i.e. 150 cm x 60 cm and 120 cm x 60 cm were at par and recorded significantly higher seed and stalk yields as well as productivity per day than crop geometry of 90 cm x 60 cm. Fertilizing the castor crop with 120 kg N ha^-1 significantly increased growth and yield parameters as well as seed and stalk yields of castor than 80 kg N ha^-1. Interaction effect between dates of sowing and crop geometry was significant and D₁xG₁ i.e. crop sown on 15^th September at 150 cm x 60 cm crop geometry recorded the maximum number of branches per plant, number of effective spikes per plant, seed yield per plant, seed yield of first and second pickings.

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