The perfect air temperature for spreading warm season grass seed is right around 80-85 degrees (F). This roughly corresponds to the optimal soil temperatures for cool-season grass seed germination. Soil temperature, depth of planting and soil moisture are all key factors. It germinates best when the soil temperatures are between 50 and 65 degrees. Fescue has its preferred temperature range for germination. Spring seeding is your second best option for planting cool-season grasses. Moisture and temperature are the two main factors in germination. So, what conditions and temperature does grass seed germinate in? 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. The fastest grasses to grow from seed are the cool-season grasses. 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. Grass seed germinates at different rates, depending on various factors such as the grass species, weather, time of year and soil moisture. For your grass seed to thrive, it requires the right amount of warmth and moisture. The perfect air temperature for spreading cool season grass seed is 60-70 degrees (F). This is the percentage of seeds that germinated in lab tests. 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.) As soon as it has those three things, it moves from dormancy to germination. This is why it’s typically recommended to seed in the fall. Ensure the correct conditions when you seed your lawn for the best results. Aim to seed early in the season, but wait until daytime temperatures are in the 60 to 75 degree Fahrenheit range. As it consumes the nutrients in the soil, the grass will grow larger and larger. After the grass seed finishes the process of germination, it will start to grow rapidly. But this year (2016) the soil temperatures remained high through most of September. Normally this is during September and October. Typically, germination takes between five and 10 days. will return from winter dormancy? 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. 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 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. The right seed germination temperature, plenty of oxygen, and the right amount of moisture. 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