Grass takes five to 30 days to germinate from seed and 30 to 45 days after germination to fully establish itself. The exact amount of time necessary varies between seasons and grass varieties.
Ryegrass, colonial bentgrass and Kentucky bluegrass are varieties of grass that grow fastest at cool temperatures. When planted in the spring or fall, ryegrass is a fast-growing grass that takes five to 10 days to germinate from seed. Colonial bentgrass takes 10 to 14 days to germinate under optimal temperatures, and Kentucky bluegrass requires 14 to 30 days.
Bermudagrass is a grass that grows best in warm temperatures and takes 10 to 30 days to germinate. This grass variety is used in areas too warm and dry for other grass species.