Does Rye die in winter?
Fast-germinating perennial ryegrass creates a temporary green lawn for winter, then dies out when warm-season grasses green up and summer heat returns.
What temp kills ryegrass?
Temperatures above 100 degrees Fahrenheit commonly kill ryegrass, especially if during a prolonged heat wave. The typical full-sunlight location of ryegrass does not provide the grass shade, which reduces heat stress.