About 10-14 days The majority of grass seed will germinate within 10 to 14 days, but occasionally it might take up to 30 days. When you put new grass seed in your yard, it might appear to take an eternity for it to sprout.
Will grass seed germinate in chilly nights?
The soil temperature must be above 50 degrees Fahrenheit for spring sowing and dormant seeding to germinate. Optimal temperatures vary between 50 and 65 degrees (measured at a depth of 2 inches). Once we attain this soil temperature, the germination process will commence. 
Can grass seed be planted in January?
What season is optimal for sowing grass seed? – Grass seed can be spread at any time of year, however for optimal results, we recommend planting in the fall or spring. Soil must be warm and wet for seeds to germinate. In the United Kingdom, the optimum circumstances for seeding grass are in the spring and fall, when Mother Nature gives free moderate temperatures and gentle rain.
