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Montana THC Ban (2026): 7 of 8 Banned, Full List

Partial ban

As of November 12, 2026, Montana bans 7 of 8 tracked THC compounds at retail. Banned: Delta-8 THC, THCa, THCP, HHC (capsule / tablet), Delta-10 THC, THC-O Acetate and HHC-P. Restricted or gray: Delta-9 THC (vape / inhalable).

Each row below links to the determination with the controlling law verbatim.

Latest update September 23, 2026: Delta-9 THC in Montana: Status changed from illegal to restricted. Change history

When does the Montana THC ban take effect?

No THC ban effective date is pending in Montana as of November 13, 2026. Most of the federal hemp redefinition takes effect December 11, 2026. A narrower piece, covering cannabinoids the plant cannot naturally produce, started November 12, 2026.

Watchenforcement date in 28 days (H.R. 6500 (Pub. L. 119-103) / Pub. L. 119-37 Sec. 781); recent bill or agency activity

in 28 days December 11, 2026
Delta-8 THC: Federal hemp redefinition, Dec 11 piece: total THC 0.3% and 0.4 mg total THC per container
Federal · Enforcement date · H.R. 6500 (Pub. L. 119-103) / Pub. L. 119-37 Sec. 781
Pub. L. 119-103 (continuing resolution, Sept 2, 2026) delayed the rest of the Pub. L. 119-37 sec. 781 hemp definition to Dec 11, 2026 (CRS IF13136, Sept 28, 2026): hemp is measured by total tetrahydrocannabinols including THCA (0.3% dry weight), and any final product over 0.4 mg combined total THC and cannabinoids with similar effects per container leaves hemp. A product that leaves hemp is marijuana, Schedule I, in every state.
October 21, 2026
Delta-9 THC: HR 4963: Marijuana 1-to-3 Act of 2025
Federal · Bill activity
Introduced in House (2025-08-12)
took effect November 12, 2026
THC-O Acetate: Federal hemp redefinition, Nov 12 slice: THC-O acetate, which the plant cannot produce, leaves hemp
Federal · Enforcement date · H.R. 5371 (Pub. L. 119-37, Sec. 781)
Pub. L. 119-103 sec. 2019 (Sept 2, 2026): until Dec 11, 2026 the Pub. L. 119-37 sec. 781 amendments apply only to products with cannabinoids not capable of being naturally produced by a Cannabis sativa plant (7 U.S.C. 1639o(1)(C)(ii)(I) and (iv)(I)). THC-O acetate is made only by acetylating THC outside the plant, so products containing it leave the federal hemp definition on Nov 12, 2026 and fall in the Schedule I tetrahydrocannabinols listing.
took effect November 12, 2026
HHC-P: Federal hemp redefinition, Nov 12 slice: cannabinoids the plant cannot produce, including HHC-P, leave hemp
Federal · Enforcement date · H.R. 5371 (Pub. L. 119-37, Sec. 781)
Pub. L. 119-103 sec. 2019 (Sept 2, 2026): until Dec 11, 2026 the Pub. L. 119-37 sec. 781 amendments apply only to products with cannabinoids not capable of being naturally produced by a Cannabis sativa plant (7 U.S.C. 1639o(1)(C)(ii)(I) and (iv)(I)). HHC-P is not reported as produced by the plant, so on that reading products containing it leave the federal hemp definition on Nov 12, 2026. FDA's list of plant-producible cannabinoids, due Feb 10, 2026, is still unpublished.

Every tracked THC compound in Montana

Compound	Status	Headline	Effective
Delta-8 THC	Illegal	Delta-8 illegal: synthetic-cannabinoid ban (MCA 16-12-117, HB 948, Ch. 746, L. 2023)	2023-05-22
Delta-9 THC (vape / inhalable)	Restricted	Hemp Delta-9 vape - restricted
THCa	Illegal	Illegal outside the licensed marijuana program: total delta-9 basis puts THCa flower over 0.3% (MCA 80-18-101)	2023-05-22
THCP	Illegal	THCP illegal: synthetic-cannabinoid ban (MCA 16-12-117, HB 948, Ch. 746, L. 2023)	2023-05-22
THCV	Not yet verified
HHC (capsule / tablet)	Illegal	Federally scheduled (schedule_i eff. 2026-05-04) · state law: illegal	2023-05-22
Delta-10 THC	Illegal	Delta-10 THC illegal: synthetic cannabinoid ban, any cannabinoid produced artificially (MCA 16-12-117(1), 16-12-102(39))	2023-05-22
THC-O Acetate	Illegal	Federally scheduled (schedule_i eff. 2026-11-12) · state law: illegal	2023-05-22
HHC-P	Illegal	HHC-P illegal: synthetic cannabinoid ban (MCA 16-12-117(1); 16-12-102(39))	2023-05-22

Recent changes in Montana

2026-09-23Delta-9 THC (hemp-derived): Status changed from illegal to restricted.
2026-09-23Delta-9 THC (hemp-derived): Status changed from illegal to restricted.
2026-09-23Delta-9 THC (hemp-derived): Status changed from illegal to restricted.
2026-09-23Delta-9 THC (hemp-derived): Status changed from illegal to restricted.
2026-09-23THCa: Status changed from illegal to restricted.
2026-09-23Delta-9 THC (hemp-derived): Status changed from illegal to restricted.
2026-09-23Delta-9 THC (hemp-derived): Status changed from illegal to restricted.
2026-09-23Delta-9 THC (hemp-derived): Status changed from illegal to restricted.
2026-09-23THCa: Status changed from restricted to illegal.
2026-09-23Delta-9 THC (hemp-derived): Status changed from restricted to illegal.

Nearby

Idaho THC ban partial ban
North Dakota THC ban banned
South Dakota THC ban partial ban
Wyoming THC ban partial ban

THC ban in every state · All compounds in Montana · Federal hemp ban: what changes Nov 12 and Dec 11

Cite this page

Compound Analytics. “Montana THC Ban (2026): 7 of 8 Banned, Full List.” Compound Laws, https://compoundlaws.com/bans/thc/montana/. Accessed November 13, 2026.

Compound Laws, published by Compound Analytics, reports the record: statutes verbatim, official citations, enforcement facts and verification dates. Nothing here is legal advice and nothing here describes how to get around a law. A jurisdiction with no verified row is reported as not yet verified, never as legal. Found an error? Corrections policy.

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