Normally this is during September and October. Follow best practices for planting grass seed, from seed selection and soil testing to proper care during germination and beyond. https://www.allotment-garden.org/.../best-temperatures-for-seed-germination A helpful tip: When choosing your grass seed look for the germination rate on the label. 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. The right seed germination temperature, plenty of oxygen, and the right amount of 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. Ensure the correct conditions when you seed your lawn for the best results. will return from winter dormancy? For your grass seed to thrive, it requires the right amount of warmth and moisture. 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. This roughly corresponds to the optimal soil temperatures for cool-season grass seed germination. Aim to seed early in the season, but wait until daytime temperatures are in the 60 to 75 degree Fahrenheit range. The perfect air temperature for spreading cool season grass seed is 60-70 degrees (F). So, what conditions and temperature does grass seed germinate in? After the grass seed finishes the process of germination, it will start to grow rapidly. The fastest grasses to grow from seed are the cool-season grasses. One of the biggest things ground temperatures affect is seed germination. The perfect air temperature for spreading warm season grass seed is right around 80-85 degrees (F). What Germination Requires. 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. Spring seeding is your second best option for planting cool-season grasses. It germinates best when the soil temperatures are between 50 and 65 degrees. Moisture and temperature are the two main factors in germination. If you are seeding in the spring, know that it will take slightly longer for the seeds to germinate. Once germinated, the grass will continue to grow at a rate of about 2/3cm per week. 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.) Keep your grass and soil healthy and positioned for vigorous grass growth, and maintain your new tall fescue at recommended mowing heights of 3 to 4 inches. Soil temperature, depth of planting and soil moisture are all key factors. As it consumes the nutrients in the soil, the grass will grow larger and larger. 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