When Should I Fertilize in Colorado? Lawn Fertilizing Tips & Tricks: A Comprehensive Guide

Spring is the perfect time to get your lawn ready for the growing season. It is a time when your lawn will start to come out of its winter slumber and start to grow again. Fertilizing your lawn in the spring will help it green up faster, produce thicker growth and provide the necessary nutrients to sustain it through the summer months.

When Should You Begin Fertilizing for Spring in Colorado?

In this comprehensive guide, we will go through the timeline and exact directions for fertilizing your lawn in Colorado in the spring.


Start fertilizing your lawn when you start to see the first signs of spring growth, usually in early to mid-April. This is the ideal time to fertilize because your lawn will be ready to absorb the nutrients it needs to grow strong and healthy. But it depends on the type of grass and plants you have in your lawn and garden. Generally, in Colorado, it is recommended to start fertilizing cool-season grasses, such as Kentucky bluegrass, fescue, and ryegrass, in early spring, around mid-March to early April. This is the time when the soil temperature reaches a minimum of 50°F and the grass begins to show signs of new growth.


Alpha Lawn II Iron is a perfect product for spring through summer lawn fertilization in Colorado. This product is formulated with iron and other essential nutrients that will help your lawn green up quickly and stay green all season long. Iron is especially important in Colorado because it helps to combat the naturally high levels of soil pH which can lead to yellowing of the lawn.


The recommended rate of application for Alpha Lawn II Iron is 6-8 lbs per 1000 sq. ft. of lawn. It is important to apply the product evenly over the entire lawn, making sure to avoid applying it too heavily in one area and not enough in another. If you are applying by hand, use a spreader to ensure even distribution.


After applying the fertilizer, make sure to water your lawn thoroughly. This will help the fertilizer penetrate the soil and reach the roots of your grass. The water will also help the fertilizer to start working and start to release the nutrients into the soil.


Repeat the fertilization process every three months throughout the spring and summer months. This will help ensure your lawn receives the necessary nutrients to sustain it through the growing season. A healthy and well-fertilized lawn will also be less susceptible to weed growth and disease, which can be common in the hot and dry summer months in Colorado.


In addition to fertilizing, make sure to maintain your lawn properly by mowing it regularly, keeping it well-watered, and removing any dead or dying grass. Regular maintenance will help ensure your lawn stays healthy and vibrant throughout the growing season.

Other tips

  • Warm-season grasses, such as Bermuda, zoysia, and centipede grass, should be fertilized in late spring or early summer, around May or June, when the soil temperature rises above 60°F and the grass has started actively growing.
  • It is important to note that over-fertilizing or fertilizing too early can result in the stimulation of excessive growth and susceptibility to disease and pests. On the other hand, under-fertilizing can lead to weak and sparse growth. It is recommended to follow the guidelines provided by the fertilizer manufacturer and to consult with a local gardening expert for advice specific to your lawn and garden.
  • In addition to timing, the type and amount of fertilizer you use is also important. A balanced, slow-release fertilizer that contains equal amounts of nitrogen, phosphorus, and potassium is ideal for most lawns and gardens in Colorado. You can adjust the amount of fertilizer based on the type of grass or plants you have and their specific needs.

Fertilizing your lawn in the spring is an important step in getting it ready for the growing season. Using Alpha Lawn II Iron will help your lawn green up quickly and stay healthy all season long. 

By following the timeline and exact directions outlined above, you will have a beautiful and lush lawn all spring and summer long. A well-maintained and well-fertilized lawn will not only enhance the look of your property but also increase its overall value.