Quick answer (updated October 26, 2026): A new federal law changes the definition of hemp so that THCA counts toward the THC limit, and finished hemp products may contain no more than 0.4 mg of total THC per container. The change was originally set for November 12, 2026, but a September 2026 funding bill pushed it to December 11, 2026. Fully synthetic cannabinoids stay on the original November 12 timeline. After the change, high-THCA flower, most hemp THC gummies and drinks, and many full-spectrum CBD products no longer qualify as federal hemp.
This guide explains what the law says, which products it affects, what is still legal, and what could still change before December 11. We'll keep this page updated as Congress and the courts act.
Key dates at a glance
- November 12, 2025: H.R. 5371, the funding bill that ended the federal shutdown, is signed. Its Section 781 rewrites the federal hemp definition, effective after 365 days.
- September 2, 2026: H.R. 6500 (Continuing Appropriations and Extensions Act, 2027) is signed, delaying most of the change.
- November 12, 2026: Fully synthetic cannabinoids (ones a cannabis plant cannot produce) become illegal on the original timeline.
- December 11, 2026: The new total-THC definition and the 0.4 mg per-container cap take effect.
What the 2018 Farm Bill Allowed (and Why THCA Took Off)
Since 2018, federal law has defined hemp as cannabis with no more than 0.3% delta-9 THC by dry weight. THCA is not delta-9 THC. It is the raw, acidic precursor that turns into THC when heated (we explain the chemistry in our THCA guide). That gap let high-THCA flower, hemp-derived delta-9 edibles, and converted cannabinoids like delta-8 sell nationwide as "hemp."
The 2025 law closes that gap. It is the biggest change to federal hemp policy since hemp was legalized.
What the New Federal Hemp Definition Says
Under Section 781 of H.R. 5371, hemp is measured by total THC instead of delta-9 THC alone. In practice:
- THCA now counts. Labs typically calculate total THC as delta-9 THC + (THCA × 0.877). A flower testing at 20% THCA has roughly 17.5% total THC, far above the 0.3% hemp line. (See Is THCA the same as THC? for why the 0.877 factor exists.)
- A per-container cap applies to finished products. Consumer hemp products can contain no more than 0.4 mg of total THC per container. For comparison, a typical hemp delta-9 gummy has 5 to 10 mg in a single piece.
- Synthesized cannabinoids are excluded. Cannabinoids not naturally produced by the plant, and naturally occurring ones that were chemically synthesized or manufactured outside the plant, are not hemp.
Products above these limits fall outside the hemp definition. Legal analysts at Foley Hoag note that this reclassifies them as marijuana, a Schedule I controlled substance under federal law.
Which Products Are Affected on December 11?
| Product | Today (Farm Bill rules) | After Dec 11, 2026 (federal) |
|---|---|---|
| High-THCA flower and pre-rolls | Federal hemp if delta-9 ≤ 0.3% | ❌ Not hemp (total THC far over 0.3%) |
| THCA concentrates (diamonds, rosin, isolate) | Sold as hemp | ❌ Not hemp |
| Hemp delta-9 gummies and drinks (5-10 mg) | Legal if ≤ 0.3% delta-9 by weight | ❌ Over the 0.4 mg per-container cap |
| Delta-8, THCP and other converted cannabinoids | Gray area | ❌ Synthesized cannabinoids excluded |
| Full-spectrum CBD with trace THC | Legal | ⚠️ Only if the whole container stays under 0.4 mg total THC |
| Broad-spectrum and isolate CBD (no THC) | Legal | ✅ Not affected by the THC cap |
This table describes federal law only. Your state may already be stricter (see below), and the details of testing and enforcement will matter. It is not legal advice.
Why the Date Moved From November 12 to December 11
The original law gave the industry 365 days, which would have ended on November 12, 2026. In August 2026 the Senate passed a short-term government funding bill that included a 30-day delay for naturally derived hemp products. According to Foley Hoag, an amendment by Sen. Ted Budd to strip the delay was tabled 61-32, and the bill passed 90-6. The House followed, and President Trump signed H.R. 6500 on September 2, 2026.
The delay has a carve-out: fully synthetic cannabinoids that a cannabis plant cannot produce still become illegal on November 12.
Could the Ban Be Delayed Again or Replaced?
Possibly, but don't count on it. Several proposals are in play in Congress, as summarized by Foley Hoag in September 2026:
- Rep. Andy Barr (R-KY): a full regulatory framework covering manufacturing, labeling, sales, taxes, and a 21+ purchase age, instead of a ban. A Senate companion is expected from Sens. Tim Sheehy (R-MT) and Amy Klobuchar (D-MN).
- Reps. Beth Van Duyne (R-TX) and Greg Landsman (D-OH): a bill to keep hemp THC drinks legal and tax them like alcohol.
- Rep. James Comer (R-KY): a further delay, plus packaging, testing, and age rules.
On the other side, the White House's legislative affairs director reportedly committed to no further extension past December 11. Until Congress passes something new, plan around December 11.
State Laws Don't Wait for Washington
Federal timing does not override stricter state rules. Several states have already moved:
- Texas: The state health department's total-THC rule took effect March 31, 2026. On July 31, 2026, Texas reinstated Schedule I definitions covering delta-8, delta-10, THCP, and other converted THC. THCA flower is being fought in state and federal court. Full details: Is THCA legal in Texas?
- Tennessee: THCA restrictions took effect in January 2026. See our Tennessee guide.
- Ohio, New Jersey, Illinois, Alabama, Louisiana, California and others have passed their own limits, with different dates and thresholds.
For other states we cover, see our guides for Florida and Georgia. Always check your state's current rules before buying.
What This Means If You Use THCA or Hemp THC
- Know what's in your products. Read the certificate of analysis (COA) and look at total THC, not only delta-9. Our guide to reading lab reports walks through it.
- Don't assume "hemp" on a label still means legal. After December 11 the federal definition is different, even if old packaging says "Farm Bill compliant."
- Drug tests are unchanged. Workplace tests look for THC metabolites no matter what the law calls the product. See Does THCA show up on a drug test?
- Get legal advice for business decisions. If you sell or ship hemp products, talk to a cannabis attorney about your specific products and states.
Frequently Asked Questions
When does the federal hemp ban take effect?
The new total-THC definition and the 0.4 mg per-container cap take effect on December 11, 2026, after H.R. 6500 delayed the original November 12 date. Fully synthetic cannabinoids remain on the November 12, 2026 timeline.
Is THCA flower illegal after December 11, 2026?
Under the new federal definition, THCA counts toward total THC, so typical THCA flower (15-30% THCA) is far above the 0.3% hemp limit and no longer qualifies as hemp. Products outside the hemp definition are treated as marijuana under federal law.
Is CBD still legal after the hemp ban?
CBD products with no THC (broad-spectrum or isolate) are not affected by the THC cap. Full-spectrum CBD products are legal federally only if the entire container stays at or under 0.4 mg of total THC.
What does 0.4 mg per container mean?
It's the total THC allowed in the whole package, not per serving. A 30-count bottle of gummies would need to contain 0.4 mg total THC or less across all 30 pieces.
Could Congress change the law before December 11?
Yes, it could. Bills from Reps. Barr, Comer, Van Duyne and Landsman would regulate or delay the ban, but none had passed as of late October 2026. We'll update this page if that changes.
Sources
- U.S. Congress: H.R. 5371 and H.R. 6500
- Foley Hoag, "A Temporary Reprieve for Hemp-THC Products… But What Now?" (Sept. 15, 2026)
- Vicente LLP, Federal Hemp Update: Definition Change Delayed to December 11
- Texas Tribune, Texas THC ban coverage (July 30, 2026)
This article is for general information and is not legal advice. Hemp law is changing quickly; check the current federal and state rules, or consult an attorney, before buying, selling, or shipping hemp products.
