proporties to camp on in the city of boulder

Me and my girlfriend are  headed up to boulder for a couple weeks with no car or money for hotels, just want to hit some rock and do  some  backpacking around. I was wondering if any locals would be willing to let us to campout in thier yard for a couple nights. I would pack in and out morning and night, just a place to crash. I would arrive last couple nights of June. thanks very much