Abstract To evaluate the effect of planting date and weed interference on growth analysis of red beans cultivars a factorial split plot experiment in randomized complete block design with three replications was carried out in the Research Field of Zanjan University. Main plots included of three levels of red bean varieties (erect cultivar (Derakhshan), half-erect cultivar (Sayyad), creeping cultivar (Goli)) and planting dates at two levels,( 30th of May and 13th of June) and subplots included of weed interference (weed infested and weedy check). based on the results of this study in on the first sowing date becase of longer periods of growth has cumulative growth rate and dry matter more than the second sowing date. rate of dry matter and crop growth rate was greater than the second planting date.Finally, based on the results of this study the Goli cultivar due to higher performance in both planting dates and weed interference in Zanjan condition can be recommended.

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