You can find bicycle stands (in German) at almost all rapid transit and regional train stations as well as the ferry terminal at Finkenwerder, many of them roofed over. For a small fee, you can also rent special bicycle lockers to stow your bike away at certain stations.
Bit by bit, the Bike+Ride system in Hamburg is growing and growing. By 2025 it is planned to have something like 12,000 bike stands and bicycle lockers available. To ask about renting a secure bicycle locker in Hamburg, just click on the link below to the service provider P+R-Betriebsgesellschaft mbH.
In Hamburg, all other bike stands fall within the responsibility of the local district councils. In the surrounding areas, please contact your municipal authorities.