Grass seed germinates at different rates, depending on various factors such as the grass species, weather, time of year and soil moisture. But this year (2016) the soil temperatures remained high through most of September. Understanding how fast does grass grow from seed also takes understanding the factors a seed needs to germinate. As soon as it has those three things, it moves from dormancy to germination. https://www.allotment-garden.org/.../best-temperatures-for-seed-germination This is the percentage of seeds that germinated in lab tests. This roughly corresponds to the optimal soil temperatures for cool-season grass seed germination. Ensure the correct conditions when you seed your lawn for the best results. Germination – This is the development of a plant from a seed, which won’t happen unless you planted that seed at the right ground temperature. Aim to seed early in the season, but wait until daytime temperatures are in the 60 to 75 degree Fahrenheit range. Normally this is during September and October. Soil temperature, depth of planting and soil moisture are all key factors. For your grass seed to thrive, it requires the right amount of warmth and moisture. I know I saw a chart before showing the germination temperatures for cool season grasses (by variety/type), but is there a similar chart that can be used to predict when each type (TTTF, KBG, Fine Fescue, PRG, etc.) If you are seeding in the spring, know that it will take slightly longer for the seeds to germinate. The fastest grasses to grow from seed are the cool-season grasses. Follow best practices for planting grass seed, from seed selection and soil testing to proper care during germination and beyond. What Germination Requires. A helpful tip: When choosing your grass seed look for the germination rate on the label. Your seed has all that it needs to sprout and make its way above ground, except for three important things. Fescue has its preferred temperature range for germination. One of the biggest things ground temperatures affect is seed germination. Typically, germination takes between five and 10 days. So, what conditions and temperature does grass seed germinate in? The perfect air temperature for spreading cool season grass seed is 60-70 degrees (F). Spring seeding is your second best option for planting cool-season grasses. The right seed germination temperature, plenty of oxygen, and the right amount of moisture. will return from winter dormancy? Grass seed that fails to germinate cannot grow into part of a lush green lawn, so it's important to sow seed when conditions are right for germination. After the grass seed finishes the process of germination, it will start to grow rapidly. This is why it’s typically recommended to seed in the fall. 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