The article investigates the perceptions of time based on lunar and solar cycles, seasonal changes in nature, and the rhythm of agricultural work. The key events of the annual cycle in the Udmurt calendar are winter (vozhodyr/uyvozho) and summer (invozhodyr) solstices. The winter solstice period (vozhodyr, lit: transition time, crossroads / crossroads of time, the time of vozho, the time of evil spirits) and the time of the summer solstice are described. The winter period is dedicated to the winter Christmas period from January 7th to January 19th, and includes the following components: gatherings with songs and games, divination, dressing up, and mumming. The article characterises the most important events, such as mumming and masking, as well as beliefs, rituals and prohibitions connected with the spirits of the transition time. The summer solstice is connected with the image of the Mother/Foremother Invozho (In(‘)vozho-mumy), that descends from heaven to earth at that time of year. During summer solstice period the Udmurt particularly venerated heavenly powers and held calendar festivals (gershyd, gerber, gyron-bydton) in order to glorify blooming nature and peasant farmer’s labour.