When, where and how can birch sap be collected?

The timing of the birch sap collection period depends totally on the weather conditions of each year. The collection period is extremely short, only approximately 3 - 5 weeks per year. Generally sap starts to flow in April, and the collection period is over when the leaves start budding. In the beginning of the collection season the scene in the forest is still wintry and there is a lot of snow on the ground, but during the collection period most of the snow melts away.