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The best time to plant grass seed depends on your local climate and whether you have cool-season or warm-season grass.

For cool-season grasses (like tall fescue), the ideal time to seed is late summer or early fall (typically August and September). During this period, the soil is still warm from the summer, but the air is cooler, creating optimal conditions for germination and root establishment before winter. There is also less competition from weeds. Spring is a secondary option, but cooler soil temperatures, the risk of a late frost, and less time for the grass to mature before summer heat can make it less successful.

For warm-season grasses (like St. Augustine), the best time to plant is from late spring through mid-summer (typically May and June), when temperatures are consistently between 75 and 90 degrees Fahrenheit.

In general, it is best to avoid seeding during winter or early spring, as cold soil and air can prevent seeds from germinating. For recommendations tailored to your specific grass type and climate, consider consulting a local lawn care professional.

Adding seed to existing grass is often known as overseeding, as opposed to reseeding. Reseeding refers to the process of filling in bare or dying patches of lawn—or in some cases, full lawns—whereas reseeding supports existing lawns to prevent thinning. Overseeding is an ideal annual lawn care practice for grass fighting drought, disease, weeds, or pest issues.

Some grass types grow better than others on hard dirt. For example, hardy grass types like perennial ryegrass and Kentucky bluegrass will grow better on tough soil. Keep in mind that you should still consider your area’s climate when deciding on a grass type.

Depending on the species, most fescue grasses thrive in USDA hardiness zones 3 through 8, though some varieties can thrive as far as zone 10. While it’s a cool-season grass, it has the unique ability to adapt and thrive in many different types of climates. For this reason, you'll mostly find fescue grasses throughout the transitional temperature zones of the country.