Tick-borne illness is on the rise across the United States, and searches for "natural tick repellent" and "cedarwood oil for ticks" have climbed as families look for alternatives to DEET and synthetic pesticides.
Here's what the research actually says about cedarwood oil for ticks — including the one detail that separates a cedar that really works from one that mostly just smells nice.
What is cedarwood oil?
Cedarwood oil is the aromatic oil naturally produced inside cedar trees. It's the reason your grandmother kept a cedar chest for her wool sweaters — the wood slowly releases its oils into the air, creating an invisible barrier insects don't like to cross. Those same oils are what repel ticks, fleas, mosquitoes, and ants.
Not all cedar oil is the same — and this is the part that matters
This is where most cedar articles go wrong. "Cedar" covers several completely different woods, and their oils are not chemically the same:
- Eastern Red Cedar (actually a juniper) and Western Red Cedar get their punch from thujone — a neurotoxin that's also behind red cedar's sharp, stinging smell — plus plicatic acid, a known respiratory irritant. Effective on bugs, but harsh, and the reason behind most "is cedar safe around pets?" warnings.
- Incense Cedar (Calocedrus decurrens) — the cedar we mill our granules from — gets its power from carvacrol and thymoquinone instead. These are the same class of natural compounds found in oregano and thyme, and they're among the best-studied plant compounds for repelling ticks, fleas, and mosquitoes. Incense cedar carries no thujone and no plicatic acid — so it's gentler around pets and family, and it smells clean instead of sharp.
In other words: incense cedar swapped the harsh compounds for the effective ones. You get the bug-repelling power without the neurotoxin or the respiratory irritant. That's not a small distinction — it's the whole reason our granules work the way they do.
What does the research show?
- Published entomology research has documented incense cedar (Calocedrus decurrens) heartwood oil — rich in carvacrol and thymoquinone — as a repellent against blacklegged ticks (Ixodes scapularis), with repellent activity in some tests comparable to conventional options.
- Journal of Medical Entomology studies have shown cedarwood oil effective against fleas, fire ants, and mosquito larvae in laboratory and field tests.
- The EPA classifies cedarwood oil as a minimum-risk pesticide under FIFRA 25(b) — exempt from federal pesticide registration because it's considered low-risk to people, pets, and pollinators.
That last point matters. Most natural products in this category are completely unregulated. Cedarwood oil is one of a small handful the EPA has explicitly recognized as low-risk.
Why ticks avoid it
Ticks don't see the way we do. They find hosts using a sensory organ on their front legs called Haller's organ, which detects carbon dioxide, body heat, and chemical signals from skin and fur. Cedarwood oil's volatile compounds interfere with that organ. To a tick, a cedar-treated area isn't just unpleasant — it's unreadable. It can't sense hosts through it, so it avoids the area entirely.
Cedarwood oil vs. DEET
DEET works, but it has tradeoffs: it's a synthetic chemical that can damage plastics and fabrics, it isn't recommended for infants under 2 months, it can irritate skin at high concentrations, and it has to go directly on skin or clothing.
Cedarwood oil takes the opposite approach. You apply it to the environment — your yard, garden, patio, perimeter — and it works by keeping ticks from entering in the first place. No reapplying to skin every few hours, no worry about kids touching it, no damage to what it lands on.
How we use it
Our Incense Cedar Granules aren't sprayed or coated with anything — they are the cedarwood oil source. We mill them from incense cedar (Calocedrus decurrens) harvested sustainably in the mountains of the western United States. The granules slowly release their naturally occurring oils for weeks — unlike cedar-oil sprays, which evaporate within hours. The granules keep working long after you sprinkle them.
How to use cedar granules around your home
- Yard perimeter: a 2–3 foot band where the lawn meets brush, woods, or tall grass — where ticks enter from.
- Pet areas: around doghouses, kennels, dog runs, and under decks.
- Patios and play areas: around the edges of patios, sandboxes, and play sets.
- Garden beds: top-dress around plants to deter ants and flea beetles.
- After heavy rain: add a fresh top layer to renew the surface barrier.
The bottom line
Cedarwood oil isn't a miracle — but it's one of the few natural tick deterrents backed by real research, recognized by the EPA as minimum-risk, and proven over decades of use. The key is the species: incense cedar gives you the repellent power of carvacrol and thymoquinone without the harsh thujone and plicatic acid of red cedar.
If you want a chemical-free way to make your yard less hospitable to ticks, fleas, and mosquitoes — without DEET, without synthetic pesticides, and without worrying about kids and pets — incense cedar granules are the most practical option available. Shop Cedar Granules →
Sources: Published entomology research on incense cedar heartwood oil and tick repellency; Journal of Medical Entomology studies on cedarwood oil against fleas and mosquitoes; EPA FIFRA 25(b) Minimum Risk Pesticide list.