Summer Lawn Fertilization: Best Practices for a Thriving Yard

• Summer lawn fertilization is best for warm-season grasses.
• Cool-season grass is best fertilized in spring and fall.
• Choose a fertilizer that matches your grass type and lawn conditions.
• Avoid summer lawn fertilization in extreme heat or on drought-stressed grass.
• TruGreen tailors lawn fertilization to your grass, soil and local conditions.

A lush, green lawn in summer? Yes, please! Whether you're hosting backyard BBQs or just enjoying the view from your window, a healthy lawn is one of the easiest ways to boost curb appeal and enjoy your outdoor space. But when the heat hits, your grass needs a little help to stay strong.

That’s where smart summer fertilizing comes in. The right nutrients can help your lawn handle hot temps, dry spells and heavy foot traffic — without turning crispy or patchy.  

In this guide, we’ll walk you through simple, expert tips to keep your lawn thriving all summer long. You’ll also learn how TruGreen’s pros can take the guesswork (and hassle) out of fertilizing, so you can enjoy a beautiful yard without breaking a sweat. 

Short answer: yes — but timing and technique matter.

Spring showers present the perfect opportunity to fertilize your lawn in preparation for summer. As your lawn comes out of dormancy, it will need proper nutrition to support its spring green-up. Multiple, well-spaced fertilizations will not only help your lawn achieve a lush green color but also improve its overall health, getting it ready for the stresses of summer. Plus, the springtime rainfall helps enhance the effectiveness of your fertilization treatments.

For warm-season grasses like Bermuda or Zoysia, summer is peak growth time, making early-season fertilization — mid-May to early June — ideal. Fertilizing in July and August can also be beneficial. Slow-release fertilization can be an excellent choice of fertilizer in summer months as well, when conditions are right. These grasses thrive in the heat and a well-timed fertilizer boost will enhance their color and thickness. Just remember that the summer months require regular watering to keep your grass hydrated and healthy. So yes, fertilizing in summer can be beneficial, as long as timing and technique are right.

When it comes to cool-season grasses such as Tall Fescue or Kentucky Bluegrass, spring and autumn fertilization is best. These grasses tend to slow down in the heat of summer, so fertilizing during fall allows them to recover from the summer and build up reserves for the winter.  

No matter your grass type, fertilizing properly helps your lawn stay lush, resilient and better equipped to handle drought, pests and backyard traffic.

Pro tip: Don’t fertilize in the heat of the day. Midday sun + fresh fertilizer = unhappy grass. Instead, aim for early morning or evening when it’s cooler. This gives your lawn the best chance to soak up nutrients without risking burn. 

Picking the perfect fertilizer isn’t about grabbing the flashiest bag — it’s about finding what works best for your lawn and your lifestyle.

Types of Fertilizers:

• Complete Fertilizers are your all-in-one solution, containing the three key nutrients your lawn needs — nitrogen (N), phosphorus (P) and potassium (K) — plus other essential micronutrients. These fertilizers are great for providing balanced nutrition to help your lawn grow strong.
• Balanced Fertilizers offer equal amounts of those three key nutrients (like 10-10-10 or 15-15-15), but they may not always be the best choice. Your lawn might need a more tailored mix depending on the type of grass you have. A soil test can help determine the best ratio and common mixes might include 4-1-2, 5-1-3 or 5-0-3, especially in areas where phosphorus use is restricted.
• Weed and Feed fertilizers combine nutrients with a weed killer to target common weeds like dandelions. However, they only work if the weeds are actively growing, so timing is important.
• Pre-Emergent Fertilizers are ideal for preventing weeds before they even start. These fertilizers contain the same key nutrients, but also include weed preventers that stop seeds like crabgrass from germinating. Just note, they won’t help with weeds that are already growing.

Slow-Release vs. Quick-Release Fertilizers

• Slow-Release: Provides steady nutrition over time, low-maintenance, less risk of overfeeding.
• Quick-Release: Delivers fast results, needs precise timing to avoid burning grass, works best in cooler weather.

Organic vs. Synthetic Fertilizers

• Organic: Eco-friendly, improves soil health, reduces runoff and is more sustainable.
• Synthetic: Works faster, requires precise application to avoid damage, ideal for quick results.

Liquid vs. Granular Fertilizers

• Liquid: Easy to apply, absorbs quickly, good for small areas or fast fixes. Care must be used to prevent fertilizer burn in the heat of the summer.
• Granular: More control, longer-lasting effects, ideal for larger lawns, especially slow-release options. 

Summer fertilization is key to a lush, green lawn, but it’s important to avoid common mistakes that can cause more harm than good. Here are some key pitfalls to watch out for:

• Using Too Much Nitrogen: Overapplying nitrogen can burn and stress your grass. Always check the label and apply lightly to avoid damage.
• Fertilizing in Peak Heat: Fertilizing during the hottest part of the day can lead to nutrient evaporation and lawn scorch. Aim for early morning or late evening applications instead.
• Skipping Post-Fertilizer Watering: Watering after fertilizing helps nutrients reach the roots. Without watering, they can burn the grass instead of nourishing it.
• Using the Wrong Fertilizer Type: Choose a fertilizer blend that’s suited to your grass type (warm-season or cool-season) for optimal results.
• Fertilizing Stressed or Dry Grass: Never fertilize a stressed or dried-out lawn. If your grass is looking wilted or brown, water it first to avoid further damage.