How long grass seed takes to grow

Grass seed germination time varies by species, with perennial ryegrass taking 5 to 10 days and Kentucky bluegrass taking 14 to 30 days.

• Seed will germinate at a wide variety of temperatures, but optimum temperatures for germination are specific to each species.
• Temperatures separated by a dash indicate an alternation of temperatures, with the first number for about 16 hours and the second for about 8 hours.
• The 16-hour cooler period runs from evening through morning, followed by the 8 hours in the heat of the day.