While grass plugs can technically be planted any time of year, the most ideal season is spring when the weather isn’t too hot nor too cold. Just make sure any risk of a late spring frost has passed, and manage any weeds that may try to sprout in between plug plots with herbicides. The absolute worst time of year to plant grass plugs is in the summer. This is because you’ll need to water more frequently, which may accidentally lead to overwatering. Overwatering can, in turn, cause turf diseases. On the flip side, if the plugs don’t get enough water during those higher temps, they can dry out and die.