well, it's almost the right time of year to sow.
Best thing to do is sow this fall and put down pre-emergent a few times during the spring/summer next year, and fertilize in the spring so your grass gets well established before the summer heat..
Pre emergent goes down in late February. Once the soil reaches +\- 55 deg, summer annuals will germinate. Once they’ve germinated, the pre-M is useless.