Fall fertilization will benefit lawns by creating a healthier root system, which will mean a dense, green lawn in the spring. In Northern Colorado, lawns can be fertilized right up to Thanksgiving (late November). We recommend either Jirdon Winterizer Fertilizer (conventional) or *AlphaLawn Turf Winterizer (organic).
Trees and shrubs do best with a complete fertilizer such as Jirdon Tree & Shrub Fertilizer, after the leaves have fallen.
Autumn is also a good time to add chelated iron fertilizers for iron deficiencies, which is indicated by yellow-colored leaves throughout the growing season.
When in doubt, ask one of our knowledgeable staff to help you choose the fertilizers that are right for your landscape.
*Please note we are temporarily out of stock on the AlphaLawn Turf Winterizer but we will be getting more in stock soon. Please check back for availability. We have a great supply of Jirdon Winterizer Fertilizer in stock now.
Originally published on October 3rd, 2018. Updated on October 4th, 2023.