The main objective of this study was to investigate the effect of planting date on performance of teosinte (Zee mexicana) as a new sum­mer crop. Teosinte was sown from March 15 to July 15 of the two grow­ing seasons 1995 and 1996 at Sers Ellyain Research Station, Menufiya Governorate, Egypt. Planting on 1 or 15 June resulted in plants with greatest height. Planting within May or June gave the highest fresh and dry forage yields with significant differences compared to that obtained by early or late planting. Delaying planting date from March to June led to increasing in crude protein and digestible protein contents and protein yields.