USDA-Certified Firewood: Heat-Treated, Pest-Free, Cross-State Safe

USDA-certified firewood is hardwood that has been heat-treated to the United States Department of Agriculture APHIS phytosanitary standard: core temperature of 160 degrees F (71 degrees C) held for at least 75 minutes. The process kills invasive pests, mold, fungus, and pathogens that could otherwise spread across state lines.

Every piece of Firewood Flex hardwood meets or exceeds this spec. we kiln dry at 160 degrees F for 90 minutes minimum, then we test moisture on every batch to confirm sub-15% before packaging.

Why USDA certification matters

The USDA APHIS rule exists because non-certified firewood is the leading vector for invasive pests in North America. Three of the most destructive pests in the last 30 years moved on untreated wood:

• Emerald ash borer, killing tens of millions of ash trees since 2002
• Asian longhorned beetle, threatening maple, willow, birch, and elm
• Spotted lanternfly, now in 14 northeastern states

Many states and most federally-managed campgrounds, parks, and forests now require USDA-certified firewood or ban out-of-state firewood entirely. Cross-state transport of untreated firewood is illegal in NY, NJ, PA, MA, CT, and most of the Northeast.

What the certification actually proves

USDA APHIS heat treatment is the only firewood treatment that:

1. Kills all life stages of insects (eggs, larvae, adults) inside the wood
2. Kills fungal spores and mycelium
3. Reduces moisture to under 20% (we hold sub-15%)
4. Is accepted across state lines without restriction
5. Is accepted at all US national and state campgrounds

Each Firewood Flex shipment includes a phytosanitary certificate signed by our USDA-accredited inspector. Keep it with your receipt if you are camping out of state.

USDA-certified vs "seasoned" cordwood

Seasoned firewood is air-dried over 6 to 12 months. It typically tests 20 to 25 percent moisture and is not certified. Seasoning does not reliably kill invasive pests, fungal pathogens, or insect eggs. That is why "seasoned" firewood cannot be legally moved across state lines in the Northeast.

Kiln-dried, USDA-certified hardwood lights with one match, burns 30% hotter than seasoned cordwood, produces a fraction of the creosote, and stores indefinitely without re-soaking. Read our full kiln-dried vs seasoned firewood comparison.

Shop USDA-certified firewood

USDA-certified, kiln-dried under 15% moisture, four delivery formats:

• 1.75 cu ft Mega Bag: free flat-rate to 11 Northeast states (CT, DC, DE, MA, MD, NH, NJ, NY, PA, RI, VT). Nationwide delivery available at extra fee shown at checkout.
• 1.33 cu ft Box: free flat-rate to 11 Northeast states. Nationwide delivery available at extra fee shown at checkout.
• 15 Mega Bag bulk pallet (~1/4 cord) and 30 Mega Bag pallet (~1/2 cord): pallet delivery to our Local Delivery Zone (all of CT, NJ, DE; NY metro through ZIP 125; eastern PA). Locations beyond are quoted individually, email us.
• Palletized 1/4 cord and 1/2 cord: Local Delivery Zone only, lift-gate curbside drop.

Camping out of state? Bring the phytosanitary certificate. Heading to a national park? USDA-certified is the only firewood accepted at most sites.

FAQ

Is USDA-certified firewood the same as kiln-dried?
Not always. All USDA-certified wood is heat-treated to 160 degrees F core, but not all kiln-dried wood is held long enough or hot enough to qualify. We hold ours 90 minutes minimum (USDA requires 75).

Can I bring USDA-certified firewood across state lines?
Yes. USDA APHIS certification specifically authorizes interstate transport. Keep the phytosanitary certificate (included with every shipment) accessible.

Do I need USDA-certified firewood for my backyard fire pit?
Legally no, but it is the smarter buy. It lights faster, burns hotter, produces less smoke, and stores indefinitely. See our fire pit firewood guide.

How long does USDA certification last?
Indefinitely, as long as the wood is stored dry. Heat treatment is permanent.

Sources and references

This page draws on the following authorities:

• USDA APHIS Plant Pest and Disease Programs, the federal authority on phytosanitary firewood certification
• US EPA Burn Wise Program, residential wood-heater efficiency and emissions data
• USDA Forest Products Laboratory, wood density and heat-output tables
• Utah State University Cooperative Extension Forestry, heating-with-wood publications

About the Firewood Flex Team

This guide is written by the Firewood Flex operations team, the same crew that runs our distribution facility in Levittown, Pennsylvania. We log moisture content on every batch, hold heat-treatment cycles to USDA APHIS 7 CFR 301 spec, and ship to all 11 Northeast US states. Founded 2025. USPTO Serial 99591611.