Mow your current lawn down until the grass is 3/4 inch tall.
Prepare the fertilizer according to directions and spread it evenly over your lawn. You need 5 pounds of fertilizer for every 1,000 square feet of grass.
Sprinkle an even layer of rye grass seeds over your existing, fertilized grass at a ratio of 2 pounds of seeds per 1,000 square feet of lawn.
Rake over your lawn to ensure that the rye grass seeds have fallen in between the existing blades of grass. They cannot grow unless they are on top of the soil.
Water the rye grass seeds lightly on a daily basis for the first three weeks to one month after planting. Push your index finger into the soil after watering to check the moistness of the ground. If it goes in a quarter-inch, then the soil has sufficient water.
Water the rye grass bi-monthly throughout the winter if possible; sooner if the blades begin to yellow.