Propagation notes, Explorers Garden - Hinkley: fruits of the pipevine remain extremely hard until late autumn when they soften and dehisce the seeds. Seeds will germinate readily after cold stratification"

If seed is sown immediately, as soon as it is ripe in the Fall, they may germinate in 1-3 months with no moist chill, but for best results you may want to begin with the chill even if you know your seed to be freshest. You're an 8A? I'm 8B, if mine I would sow now through end of January and place the pots outside for mother nature to provide some fluctuating temps before becoming more consistently warmer.