Is THCA legal in Michigan?
Michigan wrote THCA into its definition of THC in 2021. Since then, high-THCA flower is marihuana there, sold by licensees and nobody else.
The short answer: Only through a state-licensed business. Since 2021, Michigan law has defined THC to include tetrahydrocannabinolic acid “regardless of whether it is artificially or naturally derived,” which makes high-THCA flower marihuana that only Cannabis Regulatory Agency licensees may sell, to adults 21 and over. Status as of Oct. 3, 2026.
Michigan facts
| Question | Status as of Oct. 3, 2026 |
|---|---|
| Hemp-retail lane for THCA flower | Closed. THCA counts as THC under state law |
| Licensed cannabis lane | Open. CRA-licensed retailers |
| Age | 21+ for adult use |
| Key law and date | 2021 PA 56 (HB 4517), approved July 13, 2021; definitions in MCL 333.27953 |
The definition that does the work
Michigan’s marihuana statutes now define THC broadly. Under MCL 333.27953, as amended by 2021 PA 56, THC includes “tetrahydrocannabinolic acid” and “tetrahydrocannabinol, regardless of whether it is artificially or naturally derived,” along with its isomers. Industrial hemp is cannabis with a THC concentration of 0.3 percent or less, and with THCA folded into THC, high-THCA flower cannot meet that line.
The legislature also told the regulator to set total-THC limits for hemp products intended for consumption. The result is that the hemp argument used in other states, low delta-9 on a certificate, has no purchase in Michigan.
The regulator’s position
In October 2021, the Cannabis Regulatory Agency issued a bulletin stating that it is unlawful to manufacture, possess, transfer, sell or give away these products without a CRA license. The agency has since pursued unlicensed sellers of hemp-derived THC products. National guides that list Michigan as “open retail” are describing what some shops do, not what the statute permits.
A large licensed market
Michigan is one of the biggest adult-use markets in the country, so buyers are not short of options. THCA-rich flower in a licensed store is grown, tested and tracked as marihuana, with state labels and packaging. That is the product the law recognizes.
Five years behind Michigan
Michigan’s 2021 definition already reached artificially derived THC and counted THCA; federal law catches up on Nov. 12, 2026 for cannabinoids the plant cannot naturally produce and on Dec. 11 for THCA and converted plant cannabinoids (federal dates; H.R. 6500, Sec. 2019). The two definitions will largely agree, five years apart, and licensed retail continues under state law.
Michigan retail
- Buy from a CRA-licensed retailer; adult-use customers must be 21.
- Licensed products carry state testing and tracking; hemp-shop flower does not.
Sources
- Michigan Legislature, MCL 333.27953
- Michigan Legislature, HB 4517 of 2021 (PA 56)
- CRB Monitor, Michigan continues crackdown on imported hemp derivatives, August 2024
Last reviewed Oct. 3, 2026, by the state desk.
Michigan THCA questions
Can a Michigan smoke shop sell THCA flower?
No. As of Oct. 3, 2026, Michigan law defines THC to include tetrahydrocannabinolic acid, regardless of source, and the Cannabis Regulatory Agency says manufacturing, selling or transferring such products without a CRA license is unlawful.
Where can adults buy THCA-rich flower in Michigan?
At CRA-licensed retailers, which sell it as marihuana to adults 21 and over and track it in the state's seed-to-sale system.
When did Michigan change its THC definition?
2021 PA 56 (HB 4517), approved July 13, 2021. The amended definition is in MCL 333.27953.
Disclosure: THCA Group sells flower. State Pages are reported and edited apart from the market; this page is not an offer to sell or ship into Michigan, and no Order Request is confirmed before an Operator has spoken with the buyer.
Not legal advice: read the statute, and ask a lawyer licensed in Michigan. Every state · Shop