This report is a survey of Oxford’s tree canopy cover. Oxford is rated overall 21.4% and a comparison with other cites is also available within the 14 page report.
On a ward by ward basis canopy cover ranges from 11.4 to 30 percent. Canopy cover was highest in Headington and Headington Northway at 29 and 30 percent respectively. Canopy cover was lowest in Lye Valley and Jericho Osney at 11.4 and 13 percent. (Cowley approx. 15%).
You can view or download the Oxford City Council report from here.