I seen a report of the best time is sometime late spring when the weeds are coming up then in the middle of late summer and finaly at the last of fall.
Not sure on exact date but the report i read the idea was #1 match the peak growth times of grass which is first of spring and latter fall for cool season grasses. And #2 is to catch all the weeds before they seed and keep them in control that's the main idea behind mowing that and getting new growth in the grass.
Not sure on exact date but the report i read the idea was #1 match the peak growth times of grass which is first of spring and latter fall for cool season grasses. And #2 is to catch all the weeds before they seed and keep them in control that's the main idea behind mowing that and getting new growth in the grass.