What zone and what grass type? If cool season, you probably have only one application left. You have to time it right because hitting fertilizer just before the cool season slow down can cause a flush of topgrowth that can result in winter kill and snow mold. I would wait until topgrowth has ceased and then put down your late fall application. Most starter fertilizers are mostly fast acting products and last about 4 weeks. Some have 25% slow-release fertilizer (similar to the regular stuff) so may last you 6 weeks or so.

Location is very important. If in the Transition zone you should be able to fertilize after first mowing and again in Oct. I also apply a late Nov urea application after top growth stops.