The answer to 'best time for weed control' is that the best time to apply weed control is in the spring, before weeds have a chance to germinate and spread. This is the most effective time to target weeds at their source and prevent them from taking over your lawn or garden.
Applying pre-emergent herbicides in early spring, before soil temperatures reach 55°F, will create a barrier that stops weed seeds from sprouting. This is the ideal time to tackle common annual weeds like crabgrass, dandelions, and clover. Following up with a post-emergent herbicide in late spring or early summer can help eliminate any weeds that do manage to break through.