I planted some seed in topsoil in containers outside; it was 44 degrees, 28 that night. The following morning the soil temp was 40 F. I also planted some seed that had been soaked in water for 96 hours and then dried. The GDD (Gowing Degree Days, Base 32) had accumulated to 53 by March 31. The seed was Pennington Sun and Shade from a Home Depot in Michigan, high in perennial rye, but also includes blue and fine fescue. Results in a couple of weeks. Maybe. I intend to compare the above with a seeding made last fall and last December on top of 4 inches of snow in a bare soil garden area.