USDA Updates Hemp Testing Protocol Guidance for 2026 Crop Year

The U.S. Department of Agriculture’s Agricultural Marketing Service (AMS) issued updated hemp testing-protocol guidance in February 2026, reaffirming that pre-harvest testing must use total-THC methodology and clarifying lab-registration requirements for the 2026 crop year.

Washington, D.C. — February 12, 2026. USDA’s Agricultural Marketing Service published updated technical guidance for the 2026 hemp crop year, reaffirming several testing requirements that have been in force under the federal hemp program since the 2021 Final Rule and clarifying others that have been the subject of grower complaints.

The updated guidance covers four areas. First, AMS reiterated that pre-harvest testing under the federal program uses total THC — delta-9 plus 0.877 multiplied by tetrahydrocannabinolic acid. Second, AMS clarified the timing window for sample collection (within 30 days of anticipated harvest, with limited extensions available through state plans). Third, the guidance affirmed that testing must be conducted by labs registered with the Drug Enforcement Administration. Fourth, AMS published an updated list of acceptable testing methodologies and decarboxylation protocols.

The guidance does not change the underlying federal hemp definition, which remains the 2018 Farm Bill standard of 0.3% or less delta-9 THC. Instead, USDA’s pre-harvest test confirms whether a crop will qualify as hemp at the field stage. Crops that fail must be destroyed or remediated under federal protocol.

A note in the AMS update addresses one persistent point of confusion: the federal pre-harvest total-THC test is a separate requirement from any state-level point-of-sale total-THC rule for finished consumer products. States like Georgia and Tennessee impose total-THC limits on retail flower; that is a state law, not a USDA rule.

The 2026 guidance was published in the Federal Register and is available through the AMS hemp program portal. According to Hemp Industry Daily, industry response has been mixed: large licensed growers welcomed the lab-registration clarifications, while smaller producers continued to argue that the 0.3% pre-harvest threshold remains too tight for variability in the field.

What it means for consumers

This update affects hemp farmers and licensed processors directly, not retail consumers. But it matters indirectly: every brand selling THCA flower is sourcing from farms operating under USDA or USDA-equivalent state hemp plans. When a brand publishes a Certificate of Analysis (COA) showing delta-9 ≤0.3%, that result reflects post-harvest finished-product testing. The USDA pre-harvest standard is what allowed the crop to be grown in the first place.

If a brand can’t produce both a USDA-compliant farm bill and a recent post-harvest COA, that’s a red flag.

Sources

• USDA AMS — Hemp Production Program
• Federal Register — Hemp Production Final Rule
• Hemp Industry Daily

Related

• How to Read a THCA Certificate of Analysis
• Total-THC vs Delta-9: How States Test
• What Is THCA Flower?