Can you seed early--real early? I sowed seed during each month of the winter. I used Scotts Perennial Rye. I sowed the seed in small containers which had been drilled for drainage. I used potting soil. The containers were plunged into garden soil outside in a partly shady situation. A pinch of seed was added during each month of the year. The seed was not covered nor raked in. Seed was placed on top of snow in January, February and March. When snow was deep, the containers were partially uncovered in order to find them and the seed was placed on top of about an inch of snow, and then covered up with snow to the average outdoor level. The containers were not irrigated (rain was adequate) nor was fertilizer applied. Seed sown in November arose in the fall. By May 4, 2013, each of the remaining months containers had newly sprouted grass. The November sown container had taller grass the remainder were about equal in height, about an inch. Therefore it appears that grass seed can be applied very early even on top of snow and it will arise when temperatures and heat units are suitable in the spring. The GDD50 had accumulated to about 113, at the date of the photo.