A vertically adjustable pedestal for a boat accessory includes a hollow outer column and an inner column positioned within the outer column. The inner and outer columns are longitudinally slidable with respect to one another. A plate is captured between the inner and outer columns. The plate is laterally adjustable to create a frictional force between the inner and outer columns that prevents lateral movement therebetween. One of the inner and outer columns is configured to be connected to a supporting surface of a boat. The other of the inner and outer columns is configured to be connected to the boat accessory.