Best Grub Killer for Lawns: 2026 Product Comparison

By the Lawn Care Center editorial team — updated May 2026

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White grubs — the C-shaped larvae of Japanese beetles, masked chafers, and June beetles — are the most common culprit behind unexplained brown patches in otherwise healthy lawns. By the time skunks and raccoons start digging at night, the damage is already done at the root line, and the patches you see today usually get worse before they get better.

The right product depends on two things: whether the grubs are already feeding, and how big your treatment area is. This guide compares four widely available, consumer-grade grub-control products you can buy on Amazon, with the active ingredient, treatment window, and coverage for each. We do not run our own kill-rate testing — selections are based on each product's label specifications, the active-ingredient class, and how each product fits the typical homeowner's situation.

For timing — when to put any of these down for your climate — see our hub guide on when to apply grub killer.

Preventer vs. curative — pick this first

Every consumer grub-killer is either a preventer or a curative, and using the wrong one wastes your money.

• Preventers (chlorantraniliprole, imidacloprid) are applied before grubs hatch and start feeding — generally late spring through early summer in most US lawns. They sit in the top inch of soil for weeks and kill newly hatched grubs before they cause damage. They do not reliably kill the large, late-summer grubs you'd dig up in August.
• Curatives (trichlorfon, gamma-cyhalothrin) are designed to kill active grubs that are already feeding — usually late summer into fall when the damage shows. They act fast (some within 24–72 hours) but the residual is short.

If you see grubs in the soil right now and the damage is spreading, you need a curative. If you treated last year, lost grass, and want to stop a repeat, you need a preventer applied in spring or early summer.

The 4 best grub killers for lawns in 2026

The list below is ordered by how well each product fits the most common homeowner situation. Active ingredients reflect each product's label at time of writing — manufacturers do reformulate, so confirm the current label before you buy.

1. Scotts GrubEx1 Season Long Grub Killer — best preventer

• Active ingredient: chlorantraniliprole
• Treatment window: preventer (apply before grubs hatch)
• Coverage: 10,000 sq ft (14.35 lb bag); 5,000 sq ft (5 lb bag)
• Price band: $$

GrubEx is the default recommendation for a homeowner who wants one-and-done seasonal protection. Chlorantraniliprole is the lowest-toxicity active ingredient in the consumer grub-killer category, with a long residual that keeps working for months when applied early. The trade-off: it is not a fast knockdown. If you already see grubs feeding, this is the wrong product.

Pros:

• Lowest acute-toxicity profile of the four
• Long residual — typically a single application covers the season
• Two bag sizes for small vs. average lawns

Cons:

• Will not reliably kill large, late-summer grubs already in the soil
• Higher up-front cost per bag than budget options

Apply if: you want season-long prevention, you treated for grubs last year, or your neighborhood has chronic Japanese beetle pressure.

Buy Scotts GrubEx1 on Amazon →

2. BioAdvanced 24 Hour Grub Killer Plus — best curative

• Active ingredient: trichlorfon
• Treatment window: curative (kills active grubs)
• Coverage: 10,000 sq ft (10 lb bag)
• Price band: $$

Trichlorfon is the standard curative active ingredient for active grub infestations. It moves quickly into the root zone after watering and kills feeding grubs within a few days. Residual is short — this is a "you have grubs now, kill them now" product, not a seasonal preventer. Trichlorfon is more acutely toxic than chlorantraniliprole, so follow the label's pet and pollinator re-entry instructions carefully.

Pros:

• Fast knockdown of large, feeding grubs (24–72 hours after watering in)
• Strong fit for late-summer or fall rescue treatments
• Single-bag coverage matches most suburban lots

Cons:

• Short residual — not a season-long product
• Higher acute toxicity; stricter re-entry window for pets and kids

Apply if: you've dug a square foot of damaged turf and counted 8+ grubs (the standard action threshold), the damage is actively spreading, or August/September is here and you missed the preventer window.

Buy BioAdvanced 24 Hour Grub Killer Plus on Amazon →

3. BioAdvanced Complete Insect Killer for Lawns — best dual-purpose

• Active ingredient: imidacloprid + β-cyfluthrin (per current label)
• Treatment window: early-curative + surface-pest control
• Coverage: 10,000 sq ft (10 lb bag)
• Price band: $$

Complete Insect Killer occupies the middle ground. Imidacloprid provides systemic grub control for newly hatched larvae, while β-cyfluthrin handles surface pests like ants, chinch bugs, and sod webworms in the same pass. It is less of a preventer than GrubEx (shorter residual) and less of a curative than trichlorfon (slower against large grubs), but if you have mixed pest pressure, it saves a second product. Imidacloprid is under ongoing regulatory scrutiny in some states — check local restrictions before buying.

Pros:

• Covers grubs and surface insects in one application
• Useful when chinch bugs or sod webworms are also pressuring the lawn
• Reasonable residual against early-season pests

Cons:

• Not the best at either job — neither a true season-long preventer nor a fast curative
• Imidacloprid is restricted or scrutinized in some jurisdictions

Apply if: you want one product covering grubs plus surface insects, or you have early-season pest pressure across multiple insects.

Buy BioAdvanced Complete Insect Killer on Amazon →

4. Spectracide Triazicide Insect Killer for Lawns Granules — best budget broad-spectrum

• Active ingredient: gamma-cyhalothrin
• Treatment window: curative (broad-spectrum)
• Coverage: 10,000 sq ft (10 lb bag)
• Price band: $

Triazicide is the budget option. It is a contact insecticide — it knocks down grubs and surface pests it reaches, but it does not have the systemic activity of imidacloprid or the long residual of chlorantraniliprole. Most useful on a small lawn (<5,000 sq ft), a one-time knockdown when the budget is tight, or as a curative on a confirmed light grub population.

Pros:

• Lowest cost-per-bag of the four
• Broad-spectrum — handles surface pests alongside grubs
• Easy to find at any big-box retailer if Amazon shipping is slow

Cons:

• No systemic activity — kills only what the product physically reaches
• Short residual; may need a follow-up application

Apply if: budget is the constraint, your lawn is small, or you need a quick contact-kill on confirmed light grub pressure.

Buy Spectracide Triazicide on Amazon →

At-a-glance comparison

How to apply granular grub killer

Application is roughly the same across all four products — the timing is what varies. The short version:

1. Mow your lawn before application so granules can reach the soil surface.
2. Use a broadcast or drop spreader at the rate printed on the label. Do not eyeball it. Under-applying wastes the product; over-applying wastes money and can damage the turf.
3. Water it in deeply and immediately — at least 0.5 inch of irrigation right after application. The active ingredient needs to move from the granule into the top 2–4 inches of soil where grubs feed. This is non-negotiable for preventers (chlorantraniliprole, imidacloprid). If your irrigation schedule does not support a 0.5-inch event, see our spring lawn watering schedule — under-watering is the single most common reason a grub-killer application fails.
4. Keep pets and kids off the treated area until the lawn is fully dry and granules are no longer visible. Trichlorfon in particular has a longer re-entry interval — follow the label.

For the precise calendar window for your turf zone, see our hub article on when to apply grub killer.

Considering a natural alternative?

Chemical grub control is the fastest and most reliable route, but it isn't the only option. If you'd rather avoid synthetic insecticides:

• Beneficial nematodes for lawn grubs — a parasitic nematode species applied as a soil drench. Works best on moist, warm soil and pairs well with light irrigation.
• Milky spore vs. chemical grub killer — milky spore is a soil-borne bacterium specific to Japanese beetle larvae. It is slow to establish (1–3 seasons) but persistent once it does.

Both natural options work more slowly than chemical curatives and are best treated as a multi-year program rather than a one-season fix.

A note on our recommendations

We do not run independent kill-rate testing and we do not accept payment from any of the manufacturers above. Product selection on this page is based on each product's label specifications, the active-ingredient class, and how each product fits the common homeowner situations our readers describe. Active-ingredient formulations change over time — always confirm the current label before purchase. If you have a treatment outcome to share, drop us a note via the contact page.