Not usually this time of year, but...

Where do you live?

What kind of grass do you have?

+1, although you can always feed gently with a nice, safe organic even if you're dealing with a northern grass, just so long as it's awake and growing. Say half bag rate with Milorganite, Ringers, or about seven pounds per thousand with soybean meal.

Now's the correct time to be feeding most southern grasses, however, so like David noted, it would depend on your location.

I'm in Michigan so its all cool season grasses..... mainly fescue and perennial rye and some kentucky bluegrass.

So the quinclorac really did a great job on the crabgrass, but now I'm concerned that I'm gonna end up with large bare spots.....how likely is that and should I do anything else right now or just wait until temps cool off and we start getting more rain?

This may be...beyond simply feeding it.

Look under and around the dead stuff. Is there a lot of green grass there? Or stuff you can identify as merely napping off right now?

If not, I might consider deeply scalping that, removing the trash I could, and overseeing that when temperatures cool.

Fortunately, those days are coming fast, usually about mid-August for you guys in Michigan. You'll have to water an overseeding--just in that area if that's all there is--three times daily, though.