Ship transportation on the rivers of Russia typically takes place from early spring until late autumn when the waterways are not frozen. The exact dates may vary depending on the location and specific conditions of the waterways.

In general, the shipping season in Russia starts in late March or early April and ends in late November or early December. However, some rivers may have a shorter or longer shipping season depending on their location and climate.

During the winter months, many of the rivers in Russia freeze over, which makes navigation impossible. The exact dates when shipping is closed due to icing will also depend on the location and specific conditions of the waterways. In general, shipping may be closed from late November or early December until late March or early April in most areas of Russia where river transport is used.

It’s worth noting that some of the major rivers in Russia, such as the Volga and the Don, have icebreakers that can operate during the winter months, allowing for limited shipping to continue even when the rivers are frozen.