Question: When did the last season of one tree hill air?
qaPairs: question: When did the last season of one tree hill begin to air?
answer: January 11, 2012
question: When did the last season of one tree hill finish airing?
answer: April 4, 2012
question: Over what span did the last season of one tree hill air?
answer: January 11 – April 4, 2012