The Steam Summer Sale 2017 dates have been revealed. June 22nd to July 5th. Mark your calendars and maybe hide your wallets as Steam gets ready to slash it’s prices once again. The leak comes from a Valve email to developers as per the usual leak. The date is only one and a half months away. Many believe the sales have been a bit lackluster in recent years due to the removal of the Flash Sales. However, they had to be removed thanks to the new refund system.