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The fastest growing grass seeds are Bermuda grass, which is a warm-season grass and ryegrass, which is a cool-season grass. Both of these grass types tend to germinate in five to 10 days. Other fast-growing varieties include perennial Ryegrass and fescues, all of which have unique characteristics and growing requirements.

While it may seem easier and faster to throw grass seed onto dirt and call it a day, that method likely won’t yield great results. Preparing your lawn for reseeding or seeding by clearing rocks and debris, aerating, removing existing grass, or leveling it. You should also plan out the best time to plant your grass based on its type and your location to ensure it grows well. So, if you want your grass to grow successfully, put more time and effort into the project than throwing seed on the ground.

Morning and late afternoon are the best times for watering new grass seed. The seed gets a healthy balance of water and sunlight, and the excess water evaporates. If you water the grass long after the sun goes down, the air is too cold, and there's no sun to make excess water evaporate. This keeps the grass damp for too long, increasing the chances of over-watering.

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.