Calendar · Chicago IL · Denver CO

Perennial Ryegrass care calendar for zone 5

Cold winter, mild-to-warm summer; the heart of the cool-season lawn belt. Kentucky bluegrass, tall fescue, fine fescue, and perennial rye all thrive. Spring green-up usually arrives by April; lawn is fully active May through mid-October.

Perennial ryegrass germinates in 5–7 days, faster than any other common lawn grass, which is why it is the standard "quick green-up" component of Northern seed blends and the standard winter overseed for warm-season lawns from zone 8 south. It is bunch-type, so it does not self-repair, and it is susceptible to gray leaf spot in humid summers.