Is THCA Legal in Michigan? What State Law Says in 2026

THCA in Michigan at a glance

Status	Legal with restrictions
Age limit	21+
Sale	Only CRA-licensed marijuana retailers may sell THCA-rich flower; unlicensed sale is illegal.
Possession	Adults 21+ may possess marijuana, including THCA-rich flower, within MRTMA limits.
Product rules	Industrial hemp must have 0.3% or less THC, with THCA counted as THC; hemp consumables must also meet any CRA total-THC limit.
Licensing	CRA adult-use or medical marijuana licences; hemp processing requires a CRA processor-handler licence.
Key law	MCL 333.27953(aa) (THC includes THCA), (f), (h); CRA THCA advisory
Last major change	11 October 2021

What Michigan law says about THCA

Michigan counts THCA as THC. Section 3(aa) of the Michigan Regulation and Taxation of Marihuana Act (MCL 333.27953) defines “THC” to include tetrahydrocannabinolic acid, and industrial hemp is cannabis with a THC concentration of 0.3% or less on a dry-weight basis. Above that limit, the plant or product is marijuana.¹

The Cannabis Regulatory Agency (CRA) has confirmed in an advisory that THCA is part of the legal definition of THC, that cannabis over 0.3% THC including THCA is regulated marijuana, and that processing or selling hemp requires a CRA licence.² High-THCA flower sold as hemp in smoke shops therefore does not qualify as industrial hemp under state law, and selling it without a marijuana licence is illegal, even though adults may lawfully possess marijuana within MRTMA limits.

Inside the licensed market, THCA-rich flower is sold as ordinary marijuana to adults 21 and over and to registered patients, subject to CRA testing and labelling.¹ Pending Senate bills (SB 599-602 and SB 608) would restructure hemp licensing and grower oversight; the Senate-passed version of SB 599 keeps the MRTMA definition of industrial hemp.³⁴

Local rules

Municipalities may opt out of or limit licensed marijuana businesses under the MRTMA.

Pending changes to watch

SB 599-602 and SB 608 (hemp licensing and grower oversight) passed the Senate and await House committee action.

How the federal hemp change affects Michigan

Separate from Michigan 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, which counts THCA as well as delta-9 THC, and finished products are capped at 0.4 mg of total THC per container. High-THCA flower sold as hemp today will not meet that definition, so from that date it is treated as marijuana under federal law, whatever state law says.

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, and THCA vs delta-9 THC explains why heat turns THCA into delta-9.

Timeline of recent changes

• 16 December 2025: Senate passed SB 599-602, keeping the MRTMA industrial hemp definition that counts THCA.
• 11 October 2021: MRTMA amendments took effect defining THC to include THCA and artificially derived THC.

THCA in neighbouring states

Rules change at the state line. Here is how THCA is treated in the states bordering Michigan, as of September 2026:

• Ohio: Dispensary only, 21+
• Indiana: Banned (smokable hemp law)
• Wisconsin: Unclear (post-decarb hemp test)

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.

Delta-8 in Michigan

Delta-8 is treated differently: in Michigan it is Licensed marijuana stores only, 21+ as of September 2026. Read our guide to Delta-8 law in Michigan, or compare the two compounds in THCA vs Delta-8.

Frequently asked questions

Is THCA flower legal in Michigan?

Yes, as marijuana. Adults 21 and over can buy THCA-rich flower from licensed adult-use retailers. Because Michigan’s THC definition includes THCA, flower testing above 0.3% THC counted that way is marijuana, and selling it without a CRA licence is illegal.

Does Michigan use total THC for hemp?

Effectively, yes. The MRTMA defines THC to include THCA, so the 0.3% limit for industrial hemp covers THCA as well as delta-9 THC. The Cannabis Regulatory Agency has confirmed this reading in a published advisory on THCA.

Can adults possess THCA flower in Michigan?

Adults 21 and over may possess marijuana within MRTMA limits, and THCA-rich flower counts as marijuana. The legal problem is on the supply side: businesses without a CRA licence may not sell it, and such products have not gone through state testing.

Sources

1. Michigan Legislature. MCL 333.27953, Michigan Regulation and Taxation of Marihuana Act, section 3 (definitions), as amended by 2021 PA 56 (effective 11 October 2021). legislature.mi.gov
2. Michigan Cannabis Regulatory Agency. CRA Answers Recent Questions Regarding THCA (advisory bulletin). michigan.gov/cra
3. Michigan Senate Fiscal Agency. Hemp Processing Licensure, S.B. 599 (S-3) – 602: Analysis as Passed by the Senate (28 January 2026). legislature.mi.gov
4. Michigan Legislature. Senate Bill 608 of 2025 (industrial hemp programme administration), passed Senate 4 June 2026; referred to House Committee on Regulatory Reform. legislature.mi.gov

Editorial note: This page is general legal information, not legal advice, and reflects our reading of Michigan 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 THCA table →