Terro T600 1 Lb Ant Killer Dust

The T600’s waterproof formula and 8-month effectiveness duration make it a practical choice for Montana contractors dealing with pest control around foundations and outbuildings. At 1 lb (16 oz) in an easy-to-use shaker can, this dust handles everything from crack and crevice treatments to fire ant mound applications. With ratings ranging from 4.0 to 4.8 stars across major retailers, it delivers consistent results that contractors trust.

This dust shines for perimeter treatments around agricultural buildings, equipment sheds, and anywhere persistent pest control matters more than frequent reapplication. The diazinon and amorphous diatomaceous earth active ingredients provide both chemical and mechanical pest control — a combination that works whether dealing with carpenter ants, fire ants, spiders, or a dozen other crawling pests.

Long-Term Protection That Survives Montana Weather

The standout feature isn’t just the 8-month effectiveness duration — it’s that this protection actually lasts through Montana’s variable conditions. The waterproof formula doesn’t wash away in rain, which matters when spring snowmelt and summer thunderstorms would normally require reapplication of standard dusts.

The fast-acting residual control can last up to 8 months, turning a monthly chore into a twice-yearly task. For contractors maintaining multiple properties or dealing with remote agricultural sites, that time savings adds up. The long-lasting control makes it ideal for areas where repeated access is difficult or expensive.

Specification	Value
Model Number	T600
Weight	1 lb (16 oz)
Form	Powder / Dust
Active Ingredients	Diazinon, Amorphous diatomaceous earth
Durability	Waterproof / Water-resistant
Effectiveness Duration	Up to 8 months

Versatile Application for Real Jobsite Conditions

The shaker can dispenser design beats squeeze bottles or pump sprayers when working in tight spaces. Perimeter barriers around foundations and crack/crevice treatments represent the bread-and-butter applications, but this dust handles more specialized situations too.

Fire ant mounds get direct treatment — the dust penetrates to kill the entire colony. Indoor applications work in kitchens, under appliances, and around pet food areas (avoiding direct food contact). Outdoor landscaping applications include patios, decks, and plant bases — anywhere crawling pests create problems.

The application process stays simple: shake dust from the can into cracks or along perimeters, apply directly to ant mounds, use a light even dusting and brush away excess. No mixing, no measuring, no equipment cleanup.

Target pests include ants (fire, carpenter, and others), bees, hornets, wasps, cockroaches, spiders, ticks, centipedes, silverfish, crickets, firebrats, and box-elder bugs. That broad spectrum coverage means contractors don’t need different products for different pest problems.

Larger Options for Bigger Jobs

Standard T600 comes in several configurations: the standard 1 lb can, a T901-6 6 lb volume for extensive outdoor use, and a T600VB2 2-pack of 1 lb cans for larger jobs. The 6-pound option makes sense for agricultural operations or contractors treating multiple properties.

Return policies vary by retailer — Home Depot and Target offer 90-day returns, while others follow standard retailer policies. No specific EPA, UL, or organic certifications are listed in available documentation.

The Bottom Line

Worth it for contractors who value time over constant reapplication. The 8-month waterproof protection transforms pest control from a recurring headache into scheduled maintenance. At 4.0-4.8 star ratings across Home Depot, Target, Walmart, and Scheels, field performance backs up the manufacturer claims.

Some users report the white-on-orange label can be hard to read, and the powder may spill if the container tips over. Minor annoyances that don’t outweigh the core benefits. For Montana’s short construction season and variable weather, a dust that actually lasts through rain and delivers multi-month protection earns its place in the truck.

Frequently Asked Questions

How long does Terro T600 really last outdoors? The manufacturer claims up to 8 months effectiveness, and the waterproof formula maintains this protection even through rain. Real-world performance depends on application thickness and pest pressure, but the waterproof formulation delivers notably longer protection than standard dusts.

What pests does T600 actually kill? The dust kills ants (including fire ants and carpenter ants), bees, hornets, wasps, cockroaches, spiders, ticks, centipedes, silverfish, crickets, firebrats, and box-elder bugs. The diazinon and diatomaceous earth combination provides both chemical and mechanical killing action.

Can this be used inside homes? Yes, it’s suitable for both indoor and outdoor use. Indoor applications include kitchens, under appliances, and around pet food areas, though you should avoid direct contact with food or food preparation surfaces. Keep out of reach of children and pets, and store in a cool, dry place.

What’s the difference between the 1 lb and 6 lb versions? The T901-6 Ant Killer Plus offers 6 lb volume for extensive outdoor use, while the standard T600 provides 1 lb for typical residential applications. A T600VB2 2-pack of 1 lb cans is also available for larger jobs. Same formulation, different volumes for different job sizes.