The type of grass you have is determined primarily on where you live. For example, some grasses that will thrive in one state, may fare badly in another, because of different weather conditions. There are two basic types of grass—warm-season and cool-season.
Warm season grasses tend to need fertilization in the summer, because that's when they grow. They can withstand extreme heat and readily withstands drought or even high-humidity. The best time to plant warm-season grass is between spring and summer.
Warm-season grasses include:
Cool-season grasses thrive in cool temperatures, and flourish mostly in the spring and fall, but the best time to fertilize them is in the fall. Usually, they do not look their best during the hot days of summer.
Cool-season grasses include:
Warm- and cool-season grasses have dormant periods. For warm-season grasses, it is winter. For cool-season grasses, it is summer. During this period, the grass will go off-color, turning pale. But no worries, it will get green again on its own. You do not need to add fertilizer to your grass to bring it back to its green state. It won't make a difference.