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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.

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.

While hydroseeding is designed for bare soil, it is possible to apply it over an existing lawn with certain adjustments. For the new seed to be successful, it needs good seed-to-soil contact to germinate and take root. Without proper preparation, most of the new seed will fail to establish and will die. To hydroseed over existing grass, first mow the lawn as low as possible, then loosen and clear any exposed soil. It is also recommended to use a finer mulch mixture in the hydroseed spray, which helps the seeds penetrate the existing turf and reach the soil without suffocating the established grass.

Speeding up grass seed germination is possible, but it requires quite a bit of extra work and commitment. Keeping the soil moist is key, but here are a few other tried-and-true methods for growing your new grass as quickly as possible:

• Mist grass up to eight times per day to keep the soil moist.

• Purchase a moisture-retaining seed coating for your grass seeds.

• Amend soil that is compacted or in the wrong pH range.

• Choose the right grass seed for your area’s climate and soil conditions.

• Avoid planting on windy days or during periods of extreme rain or drought.