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Highbush blueberries require proper agronomic management in order to produce high quality fruits. Calcium (Ca) has been applied in many fruit crops due to its well-established role in improving fruit quality. Our aim was to study the effect of foliar Ca sprays at different timings (early: fruit set, 8 and 16 days after fruit set-dafs; or late: 16, 24 and 32 dafs) and rates (400 or 800 g Ca ha⁻¹) on fruit quality and antioxidant features. Five Ca treatments were applied: control, early low Ca, early high Ca, late low Ca, and late high Ca to 9-year-old “Liberty” highbush blueberries in Perquenco, Araucania Region, Chile (38° 43′ 88 ″ LS), for two seasons: 2014/15 and 2015/16. Berry quality variables were analyzed at each harvest. Fruit antioxidants properties and Ca concentration in fruits and leaves were measured at 30 and 1 day before harvest (dbh), as well as the initial, middle, and final harvests. There were no …