no, its not too late...you are not referring to pre-emergent, correct? make sure it doesnt rain 2 days before or after you apply it. same with mowing. and make sure to use a surfactant with it.

My lawn is a little high, mow first spray after? Give it a day in between?

thats usually what i do, i mow, wait two days and then apply. but gotta watch the weather report. the weeds need to be growing good for the herbicide to work. also i like to apply mid morning so the afternoon sun drys the herbicide.

I just applied it to my yard. As others have said, not to late, apply at least two days after mowing, use a surfactant, wait at least two days to mow.

After day 1 I could see the weeds already wilting. You just don't want to apply it over 90 degrees

i find broadleaf weeds will show signs after a day, but the grassy weeds seem to be longer. i sprayed crabgrass a few weeks ago with quinkill...didnt start to show any signs until 7 days later. took 2 full weeks for it be completly dead.

I would agree, the grassy weeds still look perky!! I'm sure they will die with some time though as you stated. My clover patches look really beat up as well