If you are seeding in the spring, know that it will take slightly longer for the seeds to germinate. It germinates best when the soil temperatures are between 50 and 65 degrees. 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). What Germination Requires. Normally this is during September and October. 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. 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. As soon as it has those three things, it moves from dormancy to germination. will return from winter dormancy? So, what conditions and temperature does grass seed germinate in? Understanding how fast does grass grow from seed also takes understanding the factors a seed needs to germinate. The perfect air temperature for spreading warm season grass seed is right around 80-85 degrees (F). This is why it’s typically recommended to seed in the fall. One of the biggest things ground temperatures affect is seed germination. Spring seeding is your second best option for planting cool-season grasses. Typically, germination takes between five and 10 days. Once germinated, the grass will continue to grow at a rate of about 2/3cm per week. Your seed has all that it needs to sprout and make its way above ground, except for three important things. 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. 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. Follow best practices for planting grass seed, from seed selection and soil testing to proper care during germination and beyond. 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.) 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. A helpful tip: When choosing your grass seed look for the germination rate on the label. Aim to seed early in the season, but wait until daytime temperatures are in the 60 to 75 degree Fahrenheit range. The right seed germination temperature, plenty of oxygen, and the right amount of moisture. After the grass seed finishes the process of germination, it will start to grow rapidly. 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