Last Updated: March 2026
H.R. 5371 is the most consequential piece of federal hemp legislation since the 2018 Farm Bill — and most cannabis consumers haven't heard of it. If you buy THCa flower, delta-8, or other hemp-derived cannabinoids, this law directly affects your access to these products. Here's what it does, when it takes effect, and what might stop it.
What Is H.R. 5371?
H.R. 5371 is a federal law that amends the definition of "hemp" as established by the 2018 Farm Bill. The key change: it redefines the THC measurement standard used to distinguish legal hemp from illegal marijuana.
Under the 2018 Farm Bill (current law): Hemp is cannabis containing less than 0.3% delta-9 THC by dry weight. The test measures only delta-9 THC — the compound in its activated form after decarboxylation.
Under H.R. 5371 (effective November 12, 2026): Hemp is cannabis containing less than 0.3% total THC by dry weight. "Total THC" includes THCA multiplied by a conversion factor of 0.877, plus delta-9 THC. This is the standard USDA uses for hemp cultivation testing (known as "post-decarboxylation" testing).
Why Does This Matter for THCa Flower?
The impact on THCa flower is enormous. Under the current 2018 Farm Bill standard, a hemp plant can contain high percentages of THCa — because THCa itself is not counted toward the 0.3% limit, only delta-9 THC is. This loophole is what makes high-potency THCa flower (18-38% THCa) legally classifiable as "hemp."
Under H.R. 5371's total THC standard, a strain with 20% THCa would calculate to approximately 17.5% total THC — massively over the 0.3% limit. Every currently available high-potency THCa flower product would be reclassified as marijuana rather than hemp under this calculation.
The practical result: if H.R. 5371 takes effect on November 12, 2026 without successful counterlegislation, federally legal THCa flower as currently sold and shipped will no longer be legal at the federal level. Online retailers like Rare Harvest would be prohibited from shipping it via USPS. State hemp markets would need to drastically restructure.
What H.R. 5371 Also Affects
THCa flower is not the only product impacted. H.R. 5371 would also affect:
Delta-8 THC: Products made from hemp-derived delta-8 THC have existed in a legal gray area. The new law clarifies restrictions here as well, limiting delta-8 products in ways that could remove them from the hemp market.
Delta-10 THC and other minor cannabinoids: Products derived through chemical conversion from hemp CBD are subject to new restrictions under H.R. 5371.
High-CBD hemp products: Most high-CBD hemp cultivars contain relatively low THCa and would still be compliant. Pure CBD products, hemp extracts, and low-THCa varieties are not significantly impacted.
The Legislative Counteroffensive
H.R. 5371 has faced significant pushback from the hemp industry, farmers, and bipartisan members of Congress. Two major counterlegislation efforts are active:
The HEMP Act (H.R. 1287)
The Hemp Economic Mobilization Plan would codify the pre-decarboxylation testing standard — the current delta-9-only threshold — as the permanent federal standard. If passed, this would effectively nullify H.R. 5371's total THC provision and preserve the existing hemp marketplace.
Support comes primarily from hemp industry stakeholders, agricultural states with significant hemp farming, and lawmakers who see hemp as a valuable crop. The National Hemp Association and American Hemp Council have actively lobbied for H.R. 1287.
The Mace/Massie Bill (H.R. 6209)
Introduced by Representatives Mace (R-SC) and Massie (R-KY), this bill takes a different approach — arguing from constitutional and states' rights grounds that federal law should not preempt states' rights to regulate hemp products within their borders. It would also restore the pre-decarboxylation testing standard.
This bill has attracted attention from libertarian-leaning lawmakers and cannabis reform advocates who see it as a broader states' rights issue beyond just hemp.
What Happens If Neither Bill Passes?
If H.R. 1287 and H.R. 6209 both fail to pass before November 12, 2026, H.R. 5371 takes effect as written. The immediate consequences:
- Federal agencies (DEA, USDA) gain authority to enforce the total THC standard
- USPS, UPS, FedEx, and other carriers would face liability for shipping non-compliant hemp products
- Online hemp retailers would need to cease shipping high-THCa products interstate
- State hemp markets would face significant legal uncertainty
- Consumers in non-legal states who relied on hemp-derived THCa flower would lose access
States with recreational marijuana legalization would be largely unaffected — their legal markets operate under state law. But in the 20+ states without recreational legalization, consumers would lose access to one of their primary legal cannabis options.
The Industry Response
The hemp industry is not sitting quietly. Industry groups have mounted a multi-front response:
Legal challenges are anticipated — multiple organizations have signaled intent to sue over H.R. 5371's constitutionality. Agricultural lobbying in key farm states (Kentucky, Tennessee, Colorado, North Carolina) has been intense. Several state attorneys general have indicated they may challenge federal enforcement in their states.
The economic stakes are significant: the hemp industry generates billions in annual revenue and employs tens of thousands of farmers, processors, and retailers. The transition pressure on Congress is substantial.
Rare Harvest's Position and Commitment
Rare Harvest operates in full compliance with current federal law under the 2018 Farm Bill. All products are tested to meet the current delta-9 THC threshold and shipped with full COA documentation.
We are monitoring H.R. 5371 and all related legislation closely. Our commitment is to keep customers informed and to operate legally at every stage. If the legal framework changes, we will communicate clearly about what that means for our products and shipping capabilities.
For now — through at least November 12, 2026 — all current products remain fully legal to purchase and ship. Browse our current THCa flower collection here.
Frequently Asked Questions
What does H.R. 5371 do to hemp?
H.R. 5371 changes the definition of "hemp" from cannabis containing less than 0.3% delta-9 THC to cannabis containing less than 0.3% total THC (including THCa converted by a factor of 0.877). This effectively reclassifies most high-THCa flower as marijuana under federal law, effective November 12, 2026.
When does H.R. 5371 take effect?
November 12, 2026. Until that date, the 2018 Farm Bill's current framework remains in effect and THCa flower that tests below 0.3% delta-9 THC remains federally legal.
Will there be a THCa ban in 2026?
If H.R. 5371 takes effect as written and counterlegislation fails, high-potency THCa flower would effectively be federally banned starting November 12, 2026. However, the HEMP Act (H.R. 1287) and Mace/Massie Bill (H.R. 6209) could prevent this if either passes. Legal challenges are also anticipated.
Can I still buy THCa flower right now?
Yes. As of March 2026, THCa flower is fully legal under the 2018 Farm Bill and available for purchase and shipping to most US states. The November 2026 deadline gives consumers ample time to enjoy current products. Shop Rare Harvest's flower collection here.
What is the HEMP Act?
H.R. 1287, the Hemp Economic Mobilization Plan, is legislation that would codify the pre-decarboxylation (delta-9 only) testing standard as permanent federal law, effectively countering H.R. 5371's total THC provision and preserving the current hemp marketplace.
Stay informed on this evolving situation: see our complete THCa legal status guide and 2026 Farm Bill update.