How to Prepare Soil for Sod — Complete Guide

Proper soil preparation is the most important step in a successful sod installation. Good preparation ensures the sod roots make firm contact with the soil, access water and nutrients, and establish quickly.

Step 1: Remove Existing Vegetation

Remove all existing grass, weeds, and vegetation from the area. For the most thorough removal, apply a non-selective herbicide 10-14 days before installation. After the vegetation dies, remove the dead material. Do not till dead grass into the soil — this creates an uneven surface as the organic matter decomposes.

Step 2: Rough Grade the Area

Establish the rough slope and contours of your lawn. The soil should slope away from the house at approximately 1 inch per 4 feet. Fill low spots and level high spots. This is the time to correct any drainage problems before the sod goes down.

Step 3: Add Topsoil if Needed

Apply 4 inches of quality screened topsoil if your existing soil is poor, rocky, or predominantly clay. Use the topsoil calculator to determine how much you need.

Step 4: Till or Loosen the Soil

Loosen the top 4-6 inches of soil. This improves drainage and makes it easier for sod roots to penetrate. If you added topsoil, work it into the top layer of existing soil to prevent a distinct layer that can impede root growth.

Step 5: Final Grade and Smooth

Rake the surface smooth, removing rocks, clods, and debris larger than a golf ball. The final surface should be approximately 1 inch below sidewalks and driveways to allow for the thickness of the sod.

Step 6: Apply Starter Fertilizer

Apply a starter fertilizer high in phosphorus according to package directions. Lightly rake it into the top inch of soil. This gives the sod roots the nutrients they need during the critical establishment period.

Step 7: Lightly Water

Moisten the soil surface before laying sod. The soil should be damp but not muddy. This provides immediate moisture to the sod roots.