The best time to plant grass seed is generally in the spring or autumn when soil temperatures are above about 10 degrees Celsius (50 degrees Fahrenheit). These seasons provide favorable temperature ranges and usually more natural rainfall, which helps seed germination and reduces the need for additional watering. More specifically:
- For cool-season grasses (like Kentucky bluegrass, ryegrass, and fescues), the ideal planting time is in early autumn or spring , with early autumn often being preferred because of warm soil and cooler air aiding faster establishment before winter. Aim to plant at least 45 days before the first expected frost.
- For warm-season grasses (like Bermuda, zoysia, centipede), planting is best in late spring to early summer when soil temperatures are consistently warm (around 65 to 70°F or 18 to 21°C) to encourage germination.
- Avoid planting during extreme heat, drought, or cold/frosty conditions as seeds may fail to germinate or seedlings may not survive.
In summary, for most regions and grass types, planting grass seed in the spring or early autumn is optimal for best germination and lawn establishment.
