A transport frame having a longitudinal, lateral and upright extent for receiving a tip portion of a wind turbine blade is disclosed. The frame is stackable with identical frames and has a tip saddle assembly including a saddle with a support surface shaped to receive a blade tip, and a clamping mechanism having a hinged clamping arm operable between an open position and a closed position, the clamping arm, when open, allowing a blade tip to be lowered into the saddle, and when closed, securely restraining the blade tip against upward movement. The tip saddle assembly further includes a preventer serving to maintain the clamping arm in the closed position over a blade. A method of using the transport frame to clamp a wind turbine blade is also disclosed.