The best time to seed fescue grass is in late summer to early fall, ideally around mid-August to late-October. During this time, the weather is cool, but the soil still retains some warmth from summer, and fall rains provide consistent moisture. These conditions support vigorous growth and reduce the risk of heat stress, disease, and poor germination. If you miss this window, you can try seeding in early spring when temperatures start to rise and reach around 60°F. However, you should avoid planting in the summer or winter, as young fescue goes dormant in temperatures above 90°F and below 50°F.