The present investigation entitled "Standardization of steckling size and spacing for quality seed production of carrot (Daucus carota L.) under temperate conditions" was initiated at Urban Technology Park, Habbak, Division of Vegetable Science, SKUAST-Kashmir during 2013-2014. The experiment was laid out in Randomized Complete Block Design with three replications. Four spacing (S1= 60 cm x 30 cm, S2= 60 cm x 45 cm, S3= 60 cm x 60 cm and S4= 60 cm x 75 cm) and four steckling sizes (Z1= Extra Large (150-175 g), Z2= Large (125-150 g), Z3= Medium (100-125 g), Z4= Small (75-100 g)) were used. Observations were recorded on plant height, number of branches plant-1, days to emergence of primary, secondary and tertiary umbels, days to 50 % flowering and days to 50 % seed maturity in primary, secondary and tertiary umbels, number of secondary and tertiary umbels plant-1, number of secondary and tertiary umbels per square metre, diameter of primary, secondary and tertiary umbels, seed yield per primary, secondary and tertiary umbels, seed yield plant-1, seed yield plot-1, 100 seed weight of primary, secondary and tertiary umbels, seed germination in primary, secondary and tertiary umbels.