Minnesota Senate Bill Would Cap Cannabis Flower at 15% THC -- Here's What That Means

A Minnesota state senator has introduced legislation that would fundamentally reshape the state's adult-use cannabis market before it has fully launched - and the industry is pushing back hard.

Senate File 3591, introduced on February 17, 2026 by Senator Matt Klein (DFL, District 53), would cap THC content in cannabis flower at 15% and concentrates at 30%. If passed, the bill would force dispensaries to pull most of their current inventory from shelves and reshape what licensed Minnesota cultivators can legally produce for the adult-use market.

Here is a full breakdown of what the bill contains, what it would mean for consumers and businesses, and where it stands now.

TL;DR - Key Takeaways

SF 3591 would cap flower at 15% THC and concentrates at 30% THC - the lowest flower cap of any U.S. cannabis state
Most current dispensary flower (20–30% THC) would be pulled from shelves if this passes
Infused pre-rolls - one of the most popular product categories - would be banned entirely
Industry argues this will push consumers to the illegal market and tribal dispensaries not subject to the cap
Status: Referred to Senate Commerce Committee (chaired by Klein); no hearing scheduled as of early 2026

What Senate File 3591 Would Do

The legislation targets multiple product categories with different limits and requirements:

Flower and pre-rolls: Cannabis flower sold in the adult-use market would be capped at 15% total THC. Products infused with additional THC or other psychoactive cannabinoids - including infused pre-rolls, which have become one of the most popular product categories in newly opened markets - would be banned from sale entirely.

Concentrates: Cannabis concentrates, including wax, shatter, live resin, and similar extracts, would be capped at 30% total THC. This is a dramatic reduction from what currently sells in licensed markets, where concentrates routinely test between 60% and 90% THC.

Topicals and transdermal products: Hemp and cannabis topicals would be limited to 500 milligrams of total THC per package.

Candy and child-appealing products: The bill reinforces existing prohibitions on products that resemble lollipops, ice cream, pastries, candy, gummy bears, or items primarily associated with children. This portion largely codifies rules already in place under Minnesota's current cannabis regulations.

Warning signs at retail locations: Dispensaries and other THC retailers would be required to post multiple new warning notices, including statements about:

Cannabis smoke and heart and lung disease
Mental health risks and psychotic symptoms for consumers under 25
The delayed effects of edibles

Expanded package labeling: Products would require additional warning language covering brain development, addiction risk, psychosis, pregnancy, and driving under the influence of cannabis.

Who Introduced the Bill and Why

Senator Matt Klein represents District 53, covering South St. Paul and Inver Grove Heights in Dakota County. He is a DFL member and chairs the Senate Commerce and Consumer Protection Committee - the same committee where SF 3591 has been referred for its first hearing.

Klein has also announced a run for Congress, which has drawn attention to the political dimensions of the proposal. Critics have suggested the bill is designed to build a moderate policy profile ahead of a federal campaign rather than address a documented problem in the Minnesota market.

The legislation follows a pattern seen in other states where health-focused lawmakers have sought to limit high-potency products, citing research on cannabis and adolescent brain development, psychosis risk in predisposed individuals, and the normalization of very high THC content.

What Average THC Levels Look Like Today

To understand the real-world impact of these caps, it helps to know where the market actually sits.

Product Type	Typical THC Range	SF 3591 Cap	Impact
Premium flower	25–30%	15%	Most premium pulled from shelves
Mid-range flower	15–22%	15%	Top of current mid-range barely legal
Budget flower	10–17%	15%	Some products survive
Live resin concentrates	65–85%	30%	Entire category effectively banned
Wax/shatter	60–90%	30%	Entire category effectively banned
Infused pre-rolls	30–60%+	Banned outright	Complete elimination

⚠️ Market impact: Under a 15% cap, the majority of cannabis flower currently available at licensed Minnesota dispensaries would need to be removed or reformulated. A 30% concentrate cap would eliminate the entire legal concentrate market.

Industry Opposition: The Black Market Problem

The Minnesota cannabis industry has responded with strong opposition, and the core argument centers on market economics and the illegal market.

Industry leaders argue that if licensed dispensaries cannot sell high-potency products, consumers who want them will simply buy from unlicensed sellers. This is not a hypothetical. In states with THC caps or strict potency regulations, illegal market operators have consistently exploited the gap, selling unregulated, untested, and untaxed products that undercut legal retailers on both potency and price.

For a market as new as Minnesota's - with only 135 licensed businesses as of early 2026 and a testing backlog already squeezing supply - additional restrictions that limit product appeal could significantly slow legal market growth while doing little to restrict actual consumer access to high-potency cannabis.

There is also a competitiveness argument. Minnesota's tribal nations operate cannabis businesses under separate regulatory frameworks. If tribal dispensaries are not bound by the same THC caps, legal market consumers may simply drive to a tribal store instead. The result would be reduced revenue for state-licensed businesses and less tax revenue for Minnesota without actually reducing potency availability.

💡 Key concern: If SF 3591 passes but tribal dispensaries are exempt, it doesn't reduce high-potency product access - it just redirects purchasing away from taxed, state-licensed stores and toward tax-free tribal locations.

How Minnesota Compares to Other States

State	Flower THC Cap	Concentrate Cap
Minnesota (proposed SF 3591)	15%	30%
Vermont	30%	No cap
Colorado	None	None
California	None	None
Washington	None	None
Illinois	None	None

No major legal cannabis state currently caps flower THC at 15%. Vermont's 30% cap - the most restrictive among significant legal markets - has drawn ongoing criticism for driving consumers to neighboring states or the illegal market. Minnesota's proposed 15% cap would be the lowest in the country.

What Happens Next

SF 3591 has been referred to the Senate Commerce and Consumer Protection Committee. That committee is chaired by Senator Klein himself, which means he controls whether and when the bill receives a hearing.

For a bill to become law in Minnesota, it must:

Pass committee
Clear the full Senate
Pass through the House with an identical version (or through a conference process)
Be signed by the governor

Governor Tim Walz has been a supporter of cannabis legalization and has not indicated support for significant potency restrictions.

The timeline is uncertain. The 2026 legislative session has a range of cannabis-related bills in motion, including ongoing discussions about social equity licensing and technical fixes to the original 2023 legalization law. Industry advocates are expected to mobilize against the bill if it advances out of committee.

What Consumers Should Know

For consumers currently shopping at Minnesota dispensaries or tribal cannabis retailers, nothing changes today. SF 3591 is a proposal at the earliest stage of the legislative process.

If you want to make your voice heard:

Contact your state senator directly (find them at mn.gov/leg)
Submit written testimony to the Senate Commerce and Consumer Protection Committee
Attend OCM community listening events to share feedback on cannabis policy

For dispensaries and cultivators concerned about the bill, connecting with the Minnesota Cannabis Association or other industry groups is a direct path to organized advocacy.

Frequently Asked Questions

Q: What is Minnesota Senate File 3591?

SF 3591 is a bill introduced on February 17, 2026 by Senator Matt Klein (DFL) that would cap THC in adult-use cannabis flower at 15%, concentrates at 30%, and topicals at 500mg per package, while adding new retail warning signs and expanded product labeling requirements.

Q: What THC percentage does most Minnesota cannabis flower contain today?

Most premium cannabis flower currently available at Minnesota dispensaries tests between 20% and 30% THC. A 15% cap would require most current inventory to be reformulated or removed from licensed dispensary shelves.

Q: Would tribal dispensaries in Minnesota be affected by the THC cap?

Tribal cannabis businesses operate under tribal sovereignty and separate regulatory frameworks. It is unclear whether SF 3591 as written would apply equally to tribal retailers. If it does not, consumers could bypass the cap by purchasing from tribal dispensaries - undermining the bill's stated goals.

Q: What has the cannabis industry said about SF 3591?

Industry leaders have strongly opposed the bill, arguing that low THC caps will push consumers to the illegal market, undermine newly licensed Minnesota dispensaries, and have little effect on actual consumption since high-potency products will remain available from unlicensed sellers.

Q: Where is SF 3591 in the legislative process?

The bill has been referred to the Senate Commerce and Consumer Protection Committee, chaired by Senator Klein. It has not yet had a committee hearing. For it to become law, it must pass committee, clear the full Senate, pass the House, and be signed by the governor.

Q: Has any other state capped THC at 15% for cannabis flower?

No major legal cannabis state currently caps flower THC at 15%. Vermont caps flower at 30% - the most restrictive among significant legal markets - and that limit has drawn ongoing criticism for driving consumers to unregulated sources. Minnesota's proposed 15% cap would be the lowest in the country.

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