Late fall fertilizing is a crucial last step in lawn care programs north of the transition zone. Although the exact timing can vary due to weather conditions, the final fertilizer application should be made sometime in November – when the grass stops growing or slows down to the pint of not needing to be mowed, but before the ground freezes.
Proper timing is essential. If fertilizer is applied too early, while grass is actively growing, it can invite winter injury and snow mold. Do not apply fertilizer to frozen soil or over snow or ice.
A late fall fertilization will also provide better winter color, enhanced spring green up, and increased rooting.