Several physicochemical characteristics (ash, acidity, crude fat, crude fibre, sugars, moisture, ascorbic acid and soluble solids) and concentration of macro elements (Ca, Mg, Na, K) and trace elements (Al, Cd, Cr, Cu, Fe, Mn, Pb, Zn) were measured in harvested mature, green pineapple (Ananas comosus L.) fruits from Mbezi, Dar es Salaam during their off vine, open air, room temperature storage-ripening period of eight days. Pineapple fruits from early, middle and late fruit-season were studied. The results showed that the Mbezi pineapple fruits had high moisture content (68 – 89%), moderate titratable acidity (0.80 – 1.50% c.a.), low crude fat content (0.12%), low crude fibre amounts (0.40%), low ash content (0.20%), high reducing sugars (14.2 – 22.8%), high total sugars (15.2 – 30.0%), high total soluble solids (15.7 – 29.3%) and high ascorbic acid content (7.9 – 33.4%). Of the four macro elements potassium was highest in concentration. The heavy metals, copper, chromium, iron, manganese and zinc were detected at very low concentrations in the fruits indicating insignificant pollution in the fruits. Ascorbic acid, moisture, titratable acidity, sugars content and total soluble solids amounts varied within the season and with the days of storage-ripening.