The Best Lawn Fertilizers to Use This Spring

Post updated on January 7, 2025

After the long, cold winter, we’d like to welcome you back to the growing season! Spring has sprung, and now’s the perfect time to begin your lawn fertilization program and provide your turf with a burst of nutrients. 

Spring is a crucial time for your lawn as it comes out of its winter dormancy. Environmental stresses such as an extreme change in temperature will impact your grass’ overall health and growth. After your lawn has thawed come spring, it’s going to be more vulnerable to diseases, pests, and weeds. 

Using a high-quality, effective, and easy-to-use spring fertilizer will set your lawn up nicely for the year ahead. Your aim is to give your lawn the best possible start in life, so you’ll save time and energy on herbicide, insecticide, and fungicide applications in the future. A weak, shallow-rooted lawn has a difficult time competing with weeds and pests.

The lawn-care industry is saturated with many fantastic lawn fertilization products — it can be hard to choose or even know what you’re looking for. This is why we recommend you conduct a soil test before fertilization to see a specific breakdown of which nutrients your lawn needs. Once you get the results, you’ll be in a better position to select a spring lawn fertilizer tailored to your grass’ nutrient requirements. Now, doesn’t that make a lot of sense? 

Here, we’ve put together some recommendations on the best fertilizers to use on your lawn this spring. 

Why Spring Is Crucial for Lawn Health

Spring is crucial for your lawn as it emerges from its winter dormancy. Environmental stresses such as an extreme change in temperature will impact your grass’ overall health and growth. After your lawn has thawed in spring, it will be more vulnerable to diseases, pests, and weeds. 

Using a high-quality, effective, and easy-to-use spring fertilizer will set your lawn up nicely for the year ahead. Your aim is to give your lawn the best possible start in life, so you’ll save time and energy on herbicide, insecticide, and fungicide applications in the future. A weak, shallow-rooted lawn has difficulty competing with weeds and pests.

The lawn-care industry is saturated with many fantastic lawn fertilization products — choosing the best lawn fertilizer for your needs can be hard. This is why we recommend you conduct a soil test before fertilization to see a specific breakdown of which nutrients your lawn requires. Once you get the results, you’ll be in a better position to select a spring lawn fertilizer tailored to your grass’ nutrient requirements. Now, doesn’t that make a lot of sense? 

Here, we’ve put together some recommendations on the best fertilizers to use on your lawn this spring.

When to Fertilize Your Lawn in Spring

The optimum time to start spring lawn fertilization is when the soil temperature reaches consistent temperatures of around 55ºF. Before you begin applying any lawn fertilizers to your grass, make sure the ground is no longer frozen. Fertilizer won’t permeate into your soil on a hard, frozen surface.

If you want to be specific, use a soil thermometer to check the temperature of your soil. Otherwise, check for visible signs of new life in your backyard, such as grass beginning to grow or flowers blossoming. In most parts of the United States, this falls around mid-April, but be sure to make your own judgment depending on your grass type and area.

Related: When Is the Best Time to Fertilize Your Lawn?

What Fertilizer Numbers to Use in Spring

Choosing the right NPK ratio is one of the most critical aspects of selecting the best spring fertilizer for your lawn. The three numbers on a fertilizer bag represent the percentage of nitrogen (N), phosphorus (P), and potassium (K) it contains. Each macronutrient serves a specific purpose, and the ideal ratio depends on your grass type, soil condition, and the soil test results.

• Nitrogen (N): fuel for green growth — A key component of chlorophyll, the plant food that makes your grass a vibrant green. A lawn that doesn’t have enough nitrogen can look yellow and dry. Nitrogen is essential for spring because it promotes lush growth and leaf development. Look for fertilizers with a higher nitrogen content, such as 16-0-8 or 20-2-3, to kickstart your lawn’s growth after dormancy. Nitrogen also helps grass recover from winter stress and encourages a thick, uniform lawn.

•  Phosphorus (P): root development support — Phosphorus aids in root and shoot development, making it especially useful for newly seeded lawns or turf with shallow roots. In most cases, established lawns require minimal phosphorus, so choose fertilizers with a low or moderate phosphorus level, such as 14-7-14.

• Potassium (K): stress tolerance and overall health — Potassium strengthens your grass by improving its ability to withstand temperature fluctuations, soil salinity, drought, and diseases. A spring fertilizer with a moderate potassium level, such as 12-0-24, can help your lawn endure the seasonal transition and thrive in the months ahead.

Soil Testing Your Lawn

For the best grass-growing conditions, your soil’s pH level should be neutral — between six and seven. If your soil is too acidic or alkaline, you’ll need to raise or lower the pH level with corrective products.  

Related: Soil Test Kit Results Back: What Next?

Spring Fertilizer for Lawns: Granular or Liquid?

Lawn fertilizers come in two different forms, granular and liquid. There’s no right or wrong answer to which type of fertilizer you should use, but for beginner DIY lawn enthusiasts, we recommend granular lawn fertilizers. They’re easy to store and distribute and are slow-release, so nutrients will break down over longer periods. You’ll only need to reapply granular fertilizers every four to six weeks. Liquid lawn fertilizers require precision, but they’re highly effective and ensure a uniform application. They also offer faster results. Liquid fertilizer produces visible results within three days, while granular fertilizer takes between five and seven days.

Granular Lawn Fertilizers

First, always read the product label to fully understand: a) how much fertilizer your lawn needs and b) how to calibrate your broadcast spreader for even application. Generally, 3 lbs per 1000 sq. ft is a good rule to follow. Below, our founder Ron shows you how to apply granular fertilizers safely and effectively. 

If you’re using a liquid fertilizer, invest in a turf mark indicator dye, which shows areas you’ve already fertilized. Too much fertilizer will cause your lawn to grow too quickly, resulting in weak root systems vulnerable to disease. 

Related: Liquid vs Granular Fertilizer: Which Is Best for Your Lawn Needs

The Best Granular Spring Fertilizers for Your Lawn

The results of your soil test will specify which nutrients your lawn needs, but there are some exceptional fertilizers on the market that will especially help your grass green up in spring. 

Stress 12-0-24 Granular Lawn Fertilizer 

The Stress 12-0-24 from Lebanon Turf is suitable for a wide range of grass types and a great choice for spring as it contains 12% immediate and slow-release nitrogen and 24% potassium. Nitrogen will help previously dormant grass green up quickly (as will this fertilizer’s iron content), and the high potassium content will strengthen grassroots and aid water uptake and retention. A fertilizer high in potassium is ideal for spring, as it will inevitably help your lawn tolerate environmental stress, like the transition from winter to spring temperatures. 

Humic Max 16-0-8 Granular Fertilizer

For nitrogen and potassium-deprived soil, try Humic Max. This lawn fertilizer contains 35% MESA slow-release nitrogen, which works on all grass types for a deep green color. Humic Max has an excellent balance of nitrogen and potassium compared to other fertilizers. This makes it ideal for monthly feeding, and you’ll see the effects of using this fertilizer in five to seven days. The addition of a humic acid biostimulant improves soil quality and stimulates beneficial microbial activity. This helps you get the most out of your fertilizer applications.

Related: What Is a Lawn Biostimulant and Why Are They Important?

Complete 14-7-14 Granular Fertilizer 

The Complete 14-7-14 is a granular lawn fertilizer that any beginner lawn-care enthusiast can try out. It provides your lawn with a broad range of macro and micronutrients, with results evident in as short as a week. With the substantial amounts of nitrogen and potassium (14%), your grass will green up quickly, while the added 7% phosphorus will drive deeper root growth. As Complete 14-7-14 contains slow and fast-release nitrogen, you can achieve a deep green color in your lawn without causing overgrowth. This granular fertilizer can be used as a starter fertilizer for new lawn projects or regular feeding if your soil needs a phosphorus boost. Rounding out the nutrient package is the addition of sea kelp and humic acid to improve soil quality.

The Best Liquid Spring Lawn Fertilizers

For more experienced lawn-care enthusiasts, liquid lawn fertilizers are incredibly fast-acting and effective. Using liquid fertilizers allows you to experiment with different combinations to find the perfect fertilization formula to feed your lawn. Below are a couple of our favorite products.

Release 901C™ from Mirimichi Green

Improve nutrient availability and uptake with this brilliant liquid fertilizer and biostimulant combination from Mirimichi Green. Containing 9% nitrogen and 1% potassium, this lawn fertilizer will help boost grass and root health in the spring. Its high carbon content (which creates aeration) will drive deeper, stronger root growth, while nano-sized nutrients maximize uptake and protect your turf from heat and drought.

Golf Course Lawn Liquid Micronutrient

Micronutrients are what your lawn needs in smaller amounts. Golf Course Lawn Micronutrient Blend is an excellent product for providing your turf with a wide spectrum of nutrients. Mixed with other products like Golf Course Lawn 20-2-3 and Nutri-Kelp, this lawn fertilizer will help produce a deep green color for your lawn. This micronutreient will address any lack of nutrient availability caused by extreme pH levels in your soil, providing your turf with robustness and thick foliage.

Pre-emergent Herbicides with Fertilizers

Combining a pre-emergent herbicide with a spring lawn fertilizer is a smart way to tackle weeds and feed your lawn at the same time. Pre-emergent herbicides create a protective barrier in the soil, preventing weed seeds — like crabgrass — from germinating. When paired with a nutrient-rich fertilizer, this dual-action approach strengthens your grass while stopping weeds before they start.

For best results, apply a pre-emergent herbicide with fertilizer when soil temperatures consistently reach 50–55°F, typically in early spring. Be sure to water your lawn after application to activate the herbicide and help the fertilizer penetrate the soil.

By using a pre-emergent herbicide with spring fertilizer, you can reduce weed competition, giving your grass the best chance to grow lush and green all season long.

Related: The Best Crabgrass Weed Killers That Won’t Kill Your Turfgrass 

Take the First Step to a Greener Lawn

Fertilization isn’t the only lawn care maintenance you should be doing in the spring. Soil testing, adding pre-emergents, core aeration, and topdressing are just a few things on your lawn to-do list. If you want a more seasonal breakdown, take a look at our step-by-step guide. 

To get the most from your lawn fertilizer in the spring, we thoroughly recommend core aeration. Pulling out plugs of soil from your lawn will improve the circulation of nutrients, air, and water. Importantly, looser soil improves porosity, which will maximize your spring lawn fertilizer applications by improving nutrient uptake.

Muddy or waterlogged lawn post-winter? Check out our blog post on why this happens and how to improve your lawn’s drainage in the future.