Is Delta-8 Legal in Montana? What State Law Says in 2026

Delta-8 in Montana at a glance

Status	Banned
Age limit	Not applicable (banned)
Sale	Sale, manufacture, processing and storage of synthetic cannabinoid products, including converted delta-8, is prohibited for everyone.
Possession	State law bans storing synthetic cannabinoid products and gives consumers no protection for possessing them; adult-use protections cover only marijuana.
Product rules	Synthetic cannabinoids banned outright. Hemp products are capped at 0.5 mg total delta-9 THC per serving and 2 mg per package, and hemp products with total delta-9 THC may not be sold to consumers unless FDA-authorised.
Licensing	No licence route; licensed marijuana dispensaries are also barred from selling synthetic cannabinoid products.
Key law	MCA 16-12-117 (HB 948, 2023; HB 49, 2025); MCA 16-12-102(39)-(40); MCA 50-31-239 (SB 375, 2025); ARM 42.39.701 to 42.39.702 (effective 21 Mar 2026)
Last major change	21 March 2026

What Montana law says about delta-8 THC

Montana banned converted cannabinoids in 2023. HB 948, signed on 22 May 2023, created MCA 16-12-117, which says a person may not manufacture, process, store or offer for sale a synthetic cannabinoid or synthetic cannabinoid product.¹ Montana law defines a synthetic cannabinoid as any cannabinoid produced artificially, whether by chemical synthesis or biosynthesis.² The Department of Revenue lists delta-8 THC, delta-10 THC, HHC and THC-O among the prohibited synthetic cannabinoids.⁶

HB 49 (2025) updated the ban, gave the Department of Revenue rulemaking power and added a cap of 0.5 mg total delta-9 THC per serving and 2 mg per package for hemp products sold by anyone.¹ The department’s rules, ARM 42.39.701 and 42.39.702, took effect on 21 March 2026. They treat cannabinoids made through chemical reactions or catalysts as synthetic and require clear and convincing evidence of natural origin where a product is suspected of containing synthetic THC.⁴

Separately, SB 375, effective 5 May 2025, bars the sale to consumers of any hemp product containing total delta-9 THC unless it is authorised as a food or drug by the FDA.³⁵ Taken together, there is no lawful retail route for delta-8 products in Montana.

Pending changes to watch

No bills pending: the Montana Legislature next meets in regular session in January 2027.

How the federal hemp change affects Montana

Separate from Montana law, the federal definition of hemp is changing. Under the federal hemp redefinition passed in the FY2026 appropriations law, from 11 December 2026 hemp is measured by total THC, finished products are capped at 0.4 mg of total THC per container, and cannabinoids synthesised or manufactured outside the plant are excluded. Most delta-8 on the market is made by converting CBD, so most delta-8 products will fall outside the federal hemp definition from that date, whatever state law says.

A separate provision covering cannabinoids that the plant cannot produce naturally applies from 12 November 2026. Bills to delay or repeal the change are in congressional committees, but none had advanced as of September 2026. Our explainer on the federal hemp THC limit covers the detail.

Timeline of recent changes

• 21 March 2026: Department of Revenue rules ARM 42.39.701 and 42.39.702 defining and prohibiting synthetic cannabinoids take effect.
• 5 May 2025: SB 375 bans sale to consumers of hemp products containing total delta-9 THC unless FDA-authorised.
• 7 April 2025: HB 49 revises the synthetic cannabinoid ban and caps hemp products at 0.5 mg THC per serving and 2 mg per package.
• 22 May 2023: HB 948 bans manufacture and sale of synthetic cannabinoid products, including converted delta-8.

Delta-8 in neighbouring states

Rules change at the state line. Here is how delta-8 THC is treated in the states bordering Montana, as of September 2026:

• Idaho: Illegal (Schedule I THC)
• Wyoming: Banned since 1 July 2024
• South Dakota: Converted delta-8 banned
• North Dakota: Banned

Carrying products across state lines can break the law of the state you enter, and federal law also applies. Check the destination state’s rules first.

THCA in Montana

THCA is treated differently: in Montana it is Only as marijuana at dispensaries, 21+ as of September 2026. Read our guide to THCA law in Montana, or compare the two compounds in THCA vs Delta-8.

Frequently asked questions

Is delta-8 legal in Montana?

No. Montana bans the manufacture, processing, storage and sale of synthetic cannabinoid products under MCA 16-12-117, and the Department of Revenue lists delta-8 THC among them. Because most delta-8 is made by chemically converting CBD, it has no lawful sales route in the state.

Can Montana dispensaries sell delta-8?

No. HB 49 (2025) expressly keeps synthetic cannabinoid products out of licensed adult-use dispensaries, and Department of Revenue rules effective 21 March 2026 let regulators demand evidence that a cannabinoid is naturally derived. Dispensaries sell marijuana products with naturally occurring cannabinoids only.

When did Montana ban delta-8?

The ban started with HB 948, signed on 22 May 2023. It was tightened in 2025 by HB 49, which also capped hemp products at 0.5 mg THC per serving, and by SB 375, which bars selling hemp products containing total delta-9 THC to consumers.

Sources

1. Montana Legislature. MCA 16-12-117, Synthetic cannabinoid products prohibited; restriction on sale of marijuana products (Montana Code Annotated 2025; enacted by HB 948, Ch. 746, L. 2023; amended by HB 49, Ch. 100, L. 2025). leg.mt.gov
2. Montana Legislature. MCA 16-12-102, Definitions (Montana Code Annotated 2025). leg.mt.gov
3. Montana Legislature. MCA 50-31-239, Sale of hemp product containing THC to consumers prohibited (SB 375, Ch. 394, L. 2025, effective on approval 5 May 2025). leg.mt.gov
4. Montana Department of Revenue. MAR Notice No. 2025-227.2, adoption of ARM 42.39.701 and 42.39.702 (synthetic cannabinoids) (Montana Administrative Register, 20 March 2026; effective 21 March 2026). revenuefiles.mt.gov
5. Montana Department of Revenue. 2025 Legislative Updates: New Cannabis Laws in Montana. revenue.mt.gov
6. Montana Department of Revenue, Cannabis Control Division. Synthetic Cannabinoids. revenue.mt.gov

Editorial note: This page is general legal information, not legal advice, and reflects our reading of Montana and federal law as of 24 September 2026. Hemp and cannabis laws change quickly and are enforced differently by different agencies and localities. If you sell, ship or carry these products, check the current rules with the relevant state agency or a licensed attorney.

See the full state-by-state Delta-8 table →