Is Delta-10 THC Legal in Montana?

Last reviewed: May 20, 2026

No. Delta-10 THC is classified as a synthetic marijuana product under Montana law and is banned in all retail channels. The state ban took effect May 22, 2023. Smoke shops, gas stations, CBD stores, and licensed adult-use dispensaries cannot lawfully sell delta-10 in Montana.

Montana cannabis and hemp at a glance

Montana voters legalized adult-use cannabis through Initiative 190 in November 2020. Retail sales started January 1, 2022, under the Department of Revenue Cannabis Control Division (CCD) under MCA Title 16, Chapter 12. The Department of Agriculture licenses industrial hemp cultivation under MCA Title 80, Chapter 18.

Delta-10 THC is an isomer of delta-9 produced almost exclusively through acid-catalyzed conversion or hydrogenation of hemp-derived CBD. That synthetic production method is what brings delta-10 inside Montana's synthetic-cannabinoid ban. For the parallel framework on delta-8, see our Montana delta-8 page.

What Montana law says about delta-10 THC

HB 948, signed May 22, 2023, and codified at MCA 16-12-117, bars the manufacture, sale, and distribution of synthetic marijuana products in Montana. The statute defines a synthetic cannabinoid to include any cannabinoid produced artificially by chemical synthesis or biosynthesis. The CCD's post-enactment guidance lists delta-10 THC explicitly, alongside delta-8 THC, THC-O acetates, HHC, HHC-O, HHCP, and THCP.

The 2025 Legislature added two further restrictions:

• HB 49 (2025): signed April 7, 2025, caps hemp products at 0.5 mg total THC per serving and 2 mg total THC per package, applying regardless of cannabinoid variant.
• SB 375 (2025): signed and effective May 5, 2025, prohibits the sale of any hemp product containing total delta-9 THC to consumers unless FDA-authorized.

Delta-10 is unlawful in Montana on three independent grounds: it is a synthetic cannabinoid under HB 948, it exceeds the HB 49 mg cap in any normal commercial dose, and the conversion process commonly leaves residual delta-9 that runs afoul of SB 375.

How enforcement has played out

The CCD published guidance after HB 948 took effect confirming delta-10 is captured by the synthetic cannabinoid ban. Inspections of non-licensed retailers carrying delta-10 vape carts, edibles, and gummies have continued since 2023. SB 27 (2025), effective July 1, 2025, broadened CCD authority from "inspect" to "investigate" non-licensed retailers suspected of selling unlawful cannabinoid products.

What this means for retailers selling delta-10 THC in Montana

• Do not stock delta-10 products in any Montana retail channel. There is no licensed lane, including the adult-use dispensary system, because synthetic cannabinoids are excluded from the cannabis product definitions.
• Audit certificates of analysis on hemp and CBD SKUs for delta-10 content from isomerization or conversion. Even trace amounts in a finished hemp product run into the HB 49 mg cap.
• If you are a smoke shop or convenience store that previously carried delta-10, document the date you pulled the line and dispose of remaining inventory through a lawful channel.
• Train staff to refuse delta-10 vendor pitches that frame the product as Farm Bill compliant hemp.
• Plan now for the federal H.R. 5371 §781 hemp redefinition taking effect November 12, 2026, which removes any residual federal Farm Bill cover for synthetic delta-10 nationwide.

What this means for consumers buying delta-10 THC in Montana

Delta-10 is not lawfully sold to consumers in Montana. Out-of-state shipments are subject to interception. Delta-10 produces effects similar to delta-9 THC, and its metabolites overlap with delta-9 metabolites on standard urine, saliva, and hair drug tests.

Pending federal change

The biggest near-term shift for delta-10 is federal. H.R. 5371 §781, signed November 12, 2025, explicitly excludes synthetic and chemically converted cannabinoids from the federal hemp definition. The provision takes effect November 12, 2026. Because delta-10 is produced almost exclusively by chemical conversion, it sits squarely inside the excluded category. The federal change aligns federal law with Montana's existing ban.

Frequently asked questions

Is delta-10 THC legal in Montana in 2026?
No. HB 948 (2023), codified at MCA 16-12-117, bars synthetic marijuana products including delta-10 THC.

What is delta-10 THC?
Delta-10 is an isomer of delta-9 THC. It is produced through chemical conversion from hemp-derived CBD or delta-9, typically using acid catalysts or hydrogenation.

Can I buy delta-10 at a Montana dispensary?
No. The HB 948 synthetic cannabinoid ban excludes delta-10 from the licensed adult-use category as well.

Does delta-10 show up on a drug test?
Yes. Delta-10 metabolites overlap with delta-9 THC metabolites on most standard tests and can trigger a positive.

Can I order delta-10 online to Montana?
No. Consumer sales are prohibited and out-of-state shipments are subject to interception.

How does delta-10 compare to delta-8 in Montana?
Both are produced through chemical conversion from hemp-derived CBD and both are barred under HB 948. See our Montana delta-8 page.

What changes November 12, 2026?
The federal hemp redefinition in H.R. 5371 §781 excludes synthetic and chemically converted cannabinoids from the federal hemp definition, aligning federal law with Montana's existing ban.

This page is provided for informational purposes by ComplyAssistAI LLC and is not legal advice. Hemp and cannabis law in Montana changes frequently. For business compliance questions, consult a Montana-licensed cannabis attorney. Find one in our Cannabis Lawyer Directory.