There are a number of bus services that pass through the village.
The 26 route runs Monday to Saturday between Cambridge and Royston. The timetable for this service can be found on the following link.
This is a once a day service between Cambridge and The Mordens running Mondays to Fridays. The timetable for this service can be found on the following link.
Service run by Whippet Coaches, Monday to Saturday. The service runs between Wrestlingworth and Cambridge. Although several buses run daily on this route, only one passes through Harston. Timetable on this link.
Service run on Wednesday only, between Foxton and Royston via Shelford. Timetable on this link.
This route is currently under threat from the removal of subsidy by the council. The parish council are investigating what steps can be taken to ensure that this service is retained.
Finally for the sake of completeness, the still not opened Guided Busway will run to the Trumpington Park and Ride - More details on this link.