Best Lawn Fertilizer Spreader Settings Guide

Getting your spreader settings right is the difference between a lush, even lawn and streaky, burned-out patches. Most fertilizer bags list settings for Scotts spreaders, but if you own a different brand — or you’re applying a product that doesn’t list your spreader — you’re left guessing.

This guide provides spreader settings for the most popular fertilizer and spreader combinations, plus a calibration method for any product on any spreader.

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Understanding Spreader Types

Broadcast (Rotary) Spreaders

Broadcast spreaders fling material in a wide arc using a spinning disc. They cover ground faster and are the preferred choice for most homeowners.

Best for: Yards over 2,000 sq ft, granular fertilizer, pre-emergent herbicides

Top pick: Scotts Elite Spreader — dual-rotor for even edge control

Drop Spreaders

Drop spreaders release product directly below the hopper through adjustable openings. They’re more precise but slower.

Best for: Small yards, precise application near beds and walkways, seed

Top pick: Scotts Classic Drop Spreader

For a full comparison of spreader models, check our best lawn spreaders guide.

Scotts Spreader Settings

Scotts is the most common spreader brand, and most products list Scotts settings on the bag. Here’s a reference chart for popular products:

Scotts Elite / Scotts Turf Builder EdgeGuard (Broadcast)

Product	Setting
Scotts Turf Builder Lawn Food	3.5
Scotts Turf Builder Weed & Feed	3.5
Scotts Halts Crabgrass Preventer	3.5
Scotts Step 1 (Crabgrass Preventer + Fertilizer)	3.5
Scotts Step 2 (Weed Control + Fertilizer)	3.5
Scotts GrubEx	3.5
Milorganite (6-4-0)	14
Jonathan Green Winter Survival	12
Pennington Ultragreen Lawn Fertilizer	6
Vigoro All Season Fertilizer	6
Grass seed (tall fescue)	5.5
Grass seed (Kentucky bluegrass)	4

Scotts Classic Drop Spreader

Product	Setting
Scotts Turf Builder Lawn Food	8
Milorganite (6-4-0)	18
Grass seed (tall fescue)	8.5
Grass seed (Kentucky bluegrass)	6

Other Popular Spreader Settings

Agri-Fab Broadcast Spreader (45-0462, 45-0463)

Product	Setting
Scotts Turf Builder	4
Milorganite	15
GrubEx	5
Grass seed (tall fescue)	7

Earthway Broadcast Spreader (2150, 2600A)

Product	Setting
Scotts Turf Builder	15
Milorganite	22
Grass seed (tall fescue)	18

Lesco Broadcast Spreader

Product	Setting
Lesco fertilizer (standard)	C
Milorganite	F
GrubEx	D

How to Calibrate Any Spreader

When you can’t find the right setting, calibrate it yourself. It takes 10 minutes:

What You Need

Your spreader
The product you’re applying
A bathroom scale
A tape measure
A tarp or garbage bags

Step-by-Step Calibration

Read the bag rate. Find the recommended application rate (e.g., “4 lbs per 1,000 sq ft”)
Measure a test strip. Measure a 100 sq ft area on your lawn or driveway (e.g., 10 ft × 10 ft). For a broadcast spreader, measure the effective spread width and mark a test lane.
Weigh the product. For a 100 sq ft test area at 4 lbs/1,000 sq ft, you need 0.4 lbs of product. Weigh out slightly more than you need.
Start at a low setting. Set your spreader to a low-medium setting and make one pass over your test area at a normal walking pace.
Weigh what’s left. Subtract from your starting weight to find how much you applied.
Adjust and repeat. If you applied too little, increase the setting. Too much, decrease it. Repeat until you hit the target rate.

Pro Tips for Even Application

Walk at a consistent pace — about 3 mph (a comfortable walk)
Overlap passes by 10–20% on broadcast spreaders to avoid streaks
Apply half rate in two perpendicular passes for the most even coverage. Apply half your fertilizer walking north-south, then the other half walking east-west
Close the hopper when turning to avoid dumping excess at the end of each row
Don’t fill the hopper over rough terrain — bouncing causes uneven flow

Common Spreader Mistakes

Streaky application: Usually caused by insufficient overlap between passes. On broadcast spreaders, the outside edge of each pass should reach the wheel marks of the previous pass.

Burning at turn points: Close the hopper when you slow down or turn. Product dumps at double rate when you stop moving.

Uneven flow: Make sure the product is dry. Damp granules clump and don’t flow evenly through the spreader openings.

Wrong walking speed: Walking too fast under-applies; too slow over-applies. Maintain a consistent, comfortable pace.

Spreader Maintenance

A well-maintained spreader applies more evenly:

Clean after every use — fertilizer salts corrode metal parts
Lubricate moving parts with WD-40 or silicone spray
Store indoors — rain and moisture cause rust and clogging
Check the impeller on broadcast spreaders — bent fins throw product unevenly
Replace worn agitators — the agitator keeps product flowing and wears over time

When to Fertilize

Getting the settings right matters, but so does timing. Check our spring fertilizer guide for the best products and timing for your grass type, and our organic fertilizer guide if you prefer chemical-free options.

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