Permethrin

Active ingredient: bifenthrin

⚠️ Don't buy duplicates. All brands listed contain the same active ingredient. Buying two different brands is buying the same pesticide twice.
βš–οΈ Educational use only. Always read and follow the full product label β€” the label is the law under FIFRA. Full disclaimer β†’ | βš—οΈ Mixing Calculator β†’

βš—οΈ Clothing Treatment β€” Best Application

Permethrin-treated clothing kills ticks and mosquitoes on contact β€” they don't need to bite through the fabric. A tick landing on a treated pant leg is dead within seconds. This is fundamentally different from repellents which just discourage landing. The effect persists through 6+ wash cycles because permethrin binds to fabric fibers.

This single habit β€” treating your outdoor clothing once per season β€” is the highest-impact personal tick prevention measure available. More effective than DEET alone. The CDC recommends it for outdoor workers, hikers, and anyone in tick-endemic areas.

Pants, socks, shoes, shirts, hats, and gear (backpacks, tents, sleeping bags). Focus especially on socks and lower pant legs where ticks typically first contact clothing. Treat the exterior surface β€” not the skin-contact side.

Step 1: Buy clothing spray β€” Sawyer Permethrin or similar 0.5% spray formulation
Step 2: Treat outdoors β€” Spray clothing while hanging on a line or laying flat. Wet thoroughly. Keep pets away.
Step 3: Dry completely β€” Allow 2–4 hours to dry before wearing. Odorless when dry.
Step 4: Lasts 6+ washes β€” Re-treat after 6 wash cycles or at the start of each season.

🌿 Yard & Perimeter Treatment

For yard tick control, apply permethrin to the lawn-woodland edge (the 9-foot transition zone between maintained grass and wooded areas) in late April and late August. Also treat along fence lines, under decks, and in tall grass areas. Do not apply to flowering plants.

🏷️ Products

Permethrin products β€” consumer and professional

ProductConcentrationUse
Sawyer Permethrin Spray0.5%Clothing and gear treatment β€” #1 choice
Martin's Permethrin 10%10% concentrateDilute for yard spray β€” economical
Bonide Mosquito Beater0.1% RTUReady-to-use yard spray
Permanone (aerosol)0.5%Military/outdoor clothing treatment standard
Gordon's Permethrin 10%10% concentrateLivestock, dogs, yard β€” versatile concentrate

⚠️ Safety

Permethrin is acutely toxic to cats when wet. Cats lack the liver enzyme (glucuronyl transferase) that metabolizes pyrethroids. Exposure to wet permethrin β€” even from treated clothing that isn't fully dry β€” can cause tremors, seizures, and death in cats. Always: treat clothing outdoors, dry completely before bringing inside, and keep cats away from any treated surfaces until fully dry. Dried permethrin on clothing is safe around cats.

Like all pyrethroids, permethrin is highly toxic to fish and aquatic invertebrates. Never apply within 50 feet of water. Do not apply before rain. The aquatic toxicity risk is the primary environmental concern with permethrin yard applications.

Permethrin poses very low toxicity risk to dogs and humans when dry. The EPA classifies it as likely not carcinogenic to humans. The clothing treatment use is considered one of the safest pesticide applications available β€” the amount absorbed through treated fabric is far below any health threshold.

Example
0.5 oz
per gallon
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πŸ› Pests This Treats β€” Learn More

Click any pest to view its full identification guide, biology, and treatment options.

πŸ› Ants β†’ πŸ› Mosquito β†’ πŸ› Scales β†’ πŸ› Ticks β†’

🌿 Environmental & Ecological Impact

🐝 Bees / PollinatorsHIGH
🐟 Fish / Aquatic LifeVERY HIGH
🐦 BirdsLOW
πŸ• Mammals / PetsLOW
🦐 Aquatic InvertebratesVERY HIGH
πŸ’‘ Highly toxic to cats when wet. Extremely toxic to fish and aquatic life.

πŸ”„ Alternatives & Related Products

Same chemical class or different approaches to the same pests.

πŸ”„
Bifenthrin
Same class: Synthetic Pyrethroid
πŸ”„
Cypermethrin
Same class: Synthetic Pyrethroid
πŸ”„
Deltamethrin
Same class: Synthetic Pyrethroid
↔️
Pyrethrin
Different approach: Botanical Pyrethrin
↔️
Boric Acid
Different approach: Inorganic

❓ Frequently Asked Questions

Q: Is permethrin safe for pets?
Safe for dogs once dry, but acutely toxic to cats when wet. Never allow cats to contact wet permethrin.
Q: Can I use permethrin indoors?
Check the specific product label β€” formulations vary. Baits and dusts often have indoor labeling; concentrates and granulars are typically outdoor.
Q: How long does permethrin last after application?
Residual varies by formulation, surface type, weather, and UV exposure. Indoor applications last longer than outdoor. Check the product label for re-application intervals.
Q: What should I do if exposed?
Remove contaminated clothing, wash skin with soap and water. For eye contact, rinse 15–20 minutes. For ingestion or severe symptoms, call Poison Control (1-800-222-1222). Have the product label available.

πŸ“‹ Safety Data Sheet (SDS)

πŸ“‹

Permethrin β€” Safety Data Sheet

View the official SDS document for this product directly on the CDMS label database.

Permethrin Safety Data Sheet page 1
πŸ“„ Permethrin β€” Safety Data Sheet Β· View the complete SDS document above or download below
πŸ“š Sources: EPA Pesticide Labels Β· NPIC Pesticide Info
Published: Jan 1, 2025 Β· Updated: Apr 10, 2026
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Reviewed by Derek GiordanoContent reviewed by a licensed pest management professional and cross-referenced against EPA, university extension, and manufacturer technical data. Last reviewed: April 2026.