During the Welcome Bay trial, which ran from June to December last year, children boarded the buses 50,327 times in the afternoon compared with 38,669 times in the morning. In the same time period the year before, children boarded 34,177 times in the afternoon compared with 22,485 boardings in the morning.
Council public transport committee chairman Andrew von Dadelszen said the reason behind the increase in afternoon boardings was largely due to children being dropped off at school in the morning and catching the bus home.
Von Dadelszen said the free trials were aimed at helping alleviate some of Tauranga's current and future commuter congestion. The scheme will cost $326,000 in the annual plan.
"It's hoped the transport trials will provide some solid information for staff to use when the decision of whether or not to continue them on a permanent basis is made," Von Dadelszen said.
Parent Lee-Anne Taylor has long called for the return of free school buses to Tauranga.
Taylor, head of the Aquinas College Parent-Teacher Association, said she saw the impact on families trying to get children to school daily. She was hopeful the citywide trial would have a significant impact.
"I would hope that more families in the region use the free school bus service and the traffic issues ease as a result," she said.
"I think the free buses will have a huge impact in several layers of the community. Already I have had families saying that they will have extra money to spend on necessities with the savings."
Taylor said she also knew of families who could not afford to send their children on the bus and would instead keep them home but would now "hopefully be able to go".
Greater Tauranga's Heidi Hughes could not be reached by deadline but has previously described the expansion of the trial "admirable".