May 27-June 28: The Apostles Fast (The Peter & Paul Fast). The Ruthenian Metropolia has identified the period from the Monday following the Sunday of All Saints (which falls on a different date each year dependent upon the date of Easter) until June 28, the day before the Feast of the Holy, Glorious, and Illustrious Pre-eminent Apostles Peter & Paul (always on June 29), as a penitential season.

By tradition it is a period of strict abstinence with the usual mitigations. Common practice in recent years has been to adopt at the very minimum some increased level of abstinence beyond that of nonpenitential seasons. The observance of this fast is voluntary.