Grass seed typically takes between 5 and 30 days to germinate, depending on the grass species, soil temperature, moisture, and other environmental factors. For example, ryegrass can germinate in 5 to 10 days, tall fescue in 7 to 14 days, and Kentucky bluegrass may take 10 to 30 days

. After germination, grass continues to grow at about 2/3 cm per week, and it usually takes about 6 to 8 weeks for the grass to become fully established and provide full coverage

. Key factors influencing germination time include:

• Grass type: Cool-season grasses like ryegrass and fescues germinate faster than warm-season grasses like bermudagrass or zoysiagrass

• Soil temperature: Germination requires soil temperatures generally above 8°C (46°F) for cool-season grasses and warmer for warm-season grasses

• Moisture: Consistent soil moisture is essential but avoid waterlogging

• Time of year: Spring and early autumn are optimal planting times for most grasses to ensure suitable temperatures and moisture

In summary, expect grass seed to start sprouting within 5 to 30 days, with full lawn establishment in about 6 to 8 weeks under good conditions.