Marijuana legalization in the United States did not begin with a single law or movement. Decades before states began legalizing medical marijuana, lawmakers and voters were already reconsidering criminal penalties for possession. Medical access later became one of the major drivers of the modern legalization movement, followed by adult-use legalization and the development of state-regulated marijuana markets.
In 1996, California became the first state in the nation to legalize medical marijuana. Three decades later, 41 states have comprehensive medical marijuana laws, while 24 states have legalized marijuana possession for adults.
Federal policy has also begun to change. In April 2026, the Department of Justice placed FDA-approved marijuana products and marijuana products subject to qualifying state medical marijuana licenses into Schedule III. A separate Drug Enforcement Administration (DEA) proceeding considering broader rescheduling ran from June 29 through July 15, 2026. The federal government subsequently urged that marijuana be moved from Schedule I to Schedule III, but a final decision on broader rescheduling remains pending.
For a current state-by-state breakdown rather than the historical timeline below, visit The Marijuana Herald’s Marijuana Laws by State guide.
Last updated: September 15, 2026
Table of Contents
What Do Decriminalization, Medical Legalization and Adult-Use Legalization Mean?
These terms describe different types of marijuana reform and are not interchangeable.
Decriminalization generally means eliminating or reducing criminal penalties for possession of small amounts of marijuana. It does not necessarily make marijuana legal, authorize cultivation or establish legal stores.
Medical marijuana legalization allows qualifying patients to possess or obtain marijuana for medical purposes. Programs vary significantly, with some allowing home cultivation and dispensary sales and others imposing much narrower restrictions.
Adult-use legalization allows adults, generally those 21 and older, to legally possess marijuana without being medical patients. A state can legalize possession without immediately authorizing retail sales.
Licensed sales are a separate step. States must establish regulatory systems governing cultivation, manufacturing, testing, distribution and retail businesses before legal commercial sales can begin. This distinction explains why marijuana possession can be legal in a jurisdiction even when there are no licensed recreational stores.
Before 1996: The Early Reform Movement
The modern marijuana reform movement predates medical legalization.
In 1973, Oregon became the first state to decriminalize possession of small amounts of marijuana, replacing criminal penalties for possession of up to an ounce with a fine. Other states followed during the 1970s.
Decriminalization was substantially different from the legalization systems that would later emerge. Marijuana cultivation and commercial sales remained illegal, but the reforms represented an early rejection of treating low-level possession as a serious criminal offense.
Oregon’s action also means the history of marijuana reform cannot be described solely as beginning with the patient-rights movement. Instead, decriminalization and criminal justice reform preceded medical legalization, while patient access became a major force behind the modern legalization movement beginning in the 1990s.
An Oregon government review of the state’s marijuana history is available here.
1996-2009: The Rise of Medical Marijuana
1996
The modern medical marijuana legalization era began in California, where voters approved Proposition 215, known as the Compassionate Use Act. The measure made California the first state to legalize medical marijuana, allowing patients and caregivers to possess and cultivate marijuana with a physician’s recommendation.
The law was significant not only because it directly challenged federal marijuana prohibition, but because it reframed marijuana as a medical and patient-access issue rather than simply a criminal justice issue. It was driven in large part by advocates responding to the AIDS crisis, cancer patients, chronic pain patients and others who argued that marijuana could provide relief when conventional treatments failed.
Arizona voters also approved a drug policy reform initiative in 1996 that included medical marijuana language, but its marijuana provision was effectively blocked because it required a doctor to “prescribe” marijuana, something doctors could not do under federal law. California, as a result, became the first functional medical marijuana state.
1998
The first wave of states followed California two years later. Voters in Alaska, Oregon and Washington approved medical marijuana initiatives, making the West Coast and parts of the Pacific Northwest central to the early medical marijuana movement.
Nevada voters also approved medical marijuana in 1998, though because of the state’s constitutional process, voters had to approve it again in 2000 before the law could take effect.
Washington, D.C., voters also approved Initiative 59 in 1998 to legalize medical marijuana, but Congress blocked the law from being implemented for more than a decade. That delay became an early example of the tension that would define marijuana policy for years: voters and state or local governments moving toward reform while the federal government maintained prohibition.
1999
Maine became the next state to legalize medical marijuana, with voters approving Question 2. The law allowed qualifying patients to possess and use marijuana for medical purposes, continuing the early pattern of reform advancing primarily through ballot initiatives rather than state legislatures.
By the end of the 1990s, medical marijuana had moved from a single-state experiment in California to a regional and national reform issue. Still, the movement remained limited. There were no adult-use legalization laws, no state-regulated recreational markets, and most medical laws were relatively basic compared to today’s programs.
2000
In 2000, Colorado and Hawaii legalized medical marijuana, while Nevada voters gave medical marijuana the second approval needed under the state constitution.
Hawaii’s law was especially notable because it became the first medical marijuana law enacted through a state legislature rather than directly by voters. Until then, the movement had relied almost entirely on ballot initiatives, largely because lawmakers were reluctant to take up marijuana reform on their own.
Colorado’s approval of medical marijuana also proved historically important. Just 12 years later, Colorado would join Washington in becoming one of the first two states to legalize marijuana for adult use.
2003
California lawmakers approved Senate Bill 420, which built on Proposition 215 by establishing a voluntary medical marijuana identification card system and creating more structure around the state’s medical marijuana law.
Maryland also took an early step in 2003 by approving a medical marijuana-related law, though it was far more limited than the comprehensive state programs that would come later. The law did not create the type of regulated medical marijuana system now common across the country, but it reflected growing political pressure to soften penalties and recognize medical use.
2004
Montana and Vermont legalized medical marijuana in 2004. Montana did so through a voter-approved initiative, while Vermont enacted its law through the legislature.
Vermont’s move was significant because it showed that legislative support for medical marijuana was beginning to grow outside the ballot initiative process. It also foreshadowed Vermont’s later role in adult-use reform. In 2018, Vermont would become the first state to legalize adult possession through the legislature.
2006
Rhode Island legalized medical marijuana in 2006, adding another Northeastern state to the growing list of medical marijuana jurisdictions.
By this point, medical marijuana had become a durable policy trend. It was still controversial, and federal law still treated marijuana as a Schedule I substance, but the idea that states could create patient-access programs was no longer isolated to California or the West Coast.
2007
New Mexico legalized medical marijuana in 2007. The state’s law was one of the more structured medical marijuana programs of its time and helped establish the model of state-licensed producers serving registered patients.
New Mexico’s program also became part of a broader shift. Medical marijuana laws were no longer just about legal protections for possession and cultivation. States were increasingly moving toward regulated supply systems, licensing, patient registries and formal oversight.
2008
Michigan voters approved medical marijuana in 2008, making it the first Midwestern state to adopt a broad medical marijuana law.
Michigan’s approval showed that medical marijuana had moved well beyond the West Coast and Northeast. It also helped set the stage for future adult-use campaigns in the Midwest, with Michigan eventually legalizing recreational marijuana a decade later.
2009
Maine voters approved Question 5 in 2009, expanding the state’s medical marijuana program and allowing nonprofit dispensaries.
That same year, the federal government under President Barack Obama issued guidance suggesting that federal prosecutors should not prioritize cases against individuals complying with state medical marijuana laws. Although the guidance did not change federal law, it gave state-legal medical marijuana programs more room to operate and helped accelerate the development of regulated dispensary systems.
2010-2014: Adult-Use Legalization Begins
2010
Arizona and New Jersey legalized medical marijuana in 2010. Arizona voters approved Proposition 203, while New Jersey enacted its medical marijuana law through the legislature.
Washington, D.C., also moved forward with medical marijuana implementation after years of congressional interference. D.C. voters had approved medical marijuana in 1998, but Congress prevented the law from taking effect until restrictions were lifted and the District enacted implementing legislation.
By 2010, medical marijuana had become a mainstream state policy, even as many programs remained restrictive. The next major question was no longer just whether marijuana should be available to patients, but whether adults should be allowed to use it regardless of medical status.
2011
Delaware legalized medical marijuana in 2011, continuing the expansion of patient-access laws in the Northeast.
Maryland also continued moving toward a more formal medical marijuana structure, building on earlier reforms. While many early laws were narrow or limited in implementation, the broader national trend was clear: State governments were becoming increasingly willing to create legal exceptions to marijuana prohibition.
2012
2012 was one of the most important years in the history of marijuana legalization.
Colorado and Washington voters approved adult-use legalization, becoming the first two states in the country to legalize marijuana for recreational use. The measures allowed adults 21 and older to possess marijuana and directed the states to establish regulated systems for production and sales.
Massachusetts also legalized medical marijuana through a ballot initiative, while Connecticut legalized medical marijuana through the legislature.
The victories in Colorado and Washington fundamentally changed the debate. Before 2012, marijuana reform was primarily framed around medical access, decriminalization and reducing penalties. After 2012, adult-use legalization became a realistic state policy option.
2013
Illinois and New Hampshire approved medical marijuana laws in 2013.
Maryland also enacted legislation establishing the Natalie M. LaPrade Medical Marijuana Commission and creating a system centered on medical marijuana programs operated by academic medical centers. The framework proved too restrictive to provide meaningful patient access because academic medical centers did not participate.
At the federal level, the Obama administration issued the Cole Memo, which outlined enforcement priorities for federal prosecutors in states that legalized marijuana. The memo did not legalize marijuana federally, but it signaled that federal prosecutors would generally focus on priorities such as distribution to minors, diversion across state lines, violence, impaired driving and other federal concerns rather than broadly targeting well-regulated state systems.
The memo gave Colorado and Washington room to move forward with regulated adult-use markets and helped reassure other states considering legalization.
2014
Alaska and Oregon voters approved adult-use legalization in 2014, joining Colorado and Washington. Washington, D.C., voters also approved Initiative 71, legalizing possession, home cultivation and gifting of marijuana by adults, though Congress blocked the District from establishing a regulated commercial market.
Minnesota and New York also legalized medical marijuana in 2014, though both programs were initially restrictive.
Maryland substantially expanded its medical marijuana framework that year after the academic medical center model established in 2013 failed to produce patient access. The new law created a broader system involving qualifying patients, registered physicians, licensed growers and medical marijuana treatment centers, allowing access outside academic medical institutions.
Additional background on Maryland’s developing medical marijuana system is available in this Maryland legislative analysis.
The 2014 election showed that adult-use legalization was not a one-time event limited to Colorado and Washington. It also highlighted the unusual status of D.C., where voters supported legalization but federal oversight prevented the city from regulating sales like a state.
2015-2019: Legalization Expands Nationwide
2015
Several states adopted limited or medical marijuana laws in 2015, including Georgia, Louisiana and Texas. Many of these early Southern laws were restrictive, often focused on low-THC marijuana oil or limited qualifying conditions, but they still marked an important shift in regions that had historically resisted marijuana reform.
Washington, D.C.’s adult-use legalization law also took effect in 2015, allowing adults to possess and grow limited amounts of marijuana. However, because Congress continued to block commercial regulations, D.C. developed a unique system where possession and gifting were legal but licensed recreational sales were not.
2016
2016 was another landmark year.
California, Maine, Massachusetts and Nevada all approved adult-use legalization, dramatically expanding the legal marijuana map. California’s approval of Proposition 64 was especially significant because of the state’s size, population and cultural influence.
Arkansas, Florida, North Dakota, Ohio and Pennsylvania also legalized medical marijuana in 2016, making it one of the biggest years ever for state medical marijuana expansion.
By the end of 2016, legalization had moved from pioneering states to some of the country’s largest and most politically diverse markets. California’s move also meant that the first medical marijuana state had now embraced adult-use legalization.
2017
West Virginia legalized medical marijuana in 2017, further expanding access in Appalachia.
States continued developing and expanding regulated marijuana programs during the year, even as the Trump administration signaled that federal marijuana enforcement policy could change.
2018
2018 brought several major developments.
On January 4, Attorney General Jeff Sessions rescinded the Obama-era marijuana enforcement guidance, including the Cole Memo. The move gave individual U.S. attorneys greater discretion over federal marijuana enforcement and created uncertainty for state-legal businesses, although it did not stop states from continuing to legalize and regulate marijuana.
The Justice Department’s announcement is available here.
Michigan voters approved adult-use legalization, making it the first Midwestern state to legalize recreational marijuana. Missouri, Oklahoma and Utah legalized medical marijuana, with Oklahoma quickly developing one of the country’s most expansive medical marijuana markets.
Vermont also became the first state to legalize adult-use marijuana through the legislature rather than by ballot initiative. Its 2018 law legalized possession and home cultivation, though it did not initially establish commercial sales.
At the federal level, Congress enacted the 2018 Farm Bill. The law removed qualifying hemp from the federal Controlled Substances Act and defined hemp as cannabis and cannabis derivatives containing no more than 0.3% delta-9 THC on a dry-weight basis.
The change did not legalize marijuana and did not automatically authorize every finished product made from hemp-derived cannabinoids. Other federal laws and regulatory requirements continued to apply. However, the law created a national legal framework for hemp and contributed to the rapid expansion of products containing CBD and other hemp-derived cannabinoids.
2019
Illinois legalized adult-use marijuana in 2019, becoming the first state to legalize and regulate recreational sales through the legislature.
That was a major turning point. Until then, adult-use legalization had largely advanced through voter initiatives. Illinois showed that lawmakers could pass legalization directly, including provisions addressing expungement, licensing and social equity.
The Illinois model influenced future legislative legalization efforts in states including New York, New Mexico, Connecticut, Virginia, Rhode Island, Delaware and Minnesota.
2020-2023: Legislatures Join the Movement
2020
Arizona, Montana and New Jersey voters approved adult-use legalization in 2020.
South Dakota voters also approved adult-use legalization, but the measure was later struck down by the state Supreme Court. South Dakota’s separate medical marijuana initiative survived.
Mississippi voters approved a medical marijuana initiative in 2020, though the state Supreme Court later invalidated the measure because of problems with the state’s ballot initiative process. Lawmakers eventually replaced it with a legislatively approved medical marijuana law in 2022.
Vermont also approved legislation in 2020 to create a regulated adult-use sales system, building on its 2018 possession and home cultivation law.
The 2020 election was notable because legalization won in conservative and swing states as well as traditionally Democratic states, reinforcing the increasingly bipartisan nature of public support for marijuana reform.
2021
New York, New Mexico, Virginia and Connecticut legalized adult-use marijuana in 2021, all through the legislative process.
New York’s legalization law was especially significant because it included automatic expungement, home cultivation, a social and economic equity program, and provisions directing marijuana tax revenue toward communities disproportionately affected by prohibition.
Virginia became the first Southern state to legalize adult possession of marijuana, though lawmakers initially failed to establish a regulated retail market. Connecticut and New Mexico also moved forward with regulated adult-use systems, continuing the trend of legislatures taking the lead.
Alabama also legalized medical marijuana in 2021, giving the Deep South another medical marijuana state.
2022
Rhode Island legalized adult-use marijuana through the legislature in 2022. Maryland and Missouri voters approved adult-use legalization through ballot measures.
Mississippi lawmakers also enacted a medical marijuana law in 2022 after the voter-approved 2020 initiative was invalidated by the state Supreme Court.
By this point, the legalization movement had entered a new stage. The debate was no longer just about whether to legalize, but how to regulate. States were wrestling with tax rates, local control, social equity, expungement, impaired driving, hemp-derived THC products and the relationship between medical and recreational markets.
2023
Delaware, Minnesota and Ohio legalized adult-use marijuana in 2023.
Delaware lawmakers approved legalization and regulation bills that became law without the governor’s signature. Minnesota legalized through the legislature, while Ohio voters approved Issue 2 at the ballot box.
Kentucky also legalized medical marijuana in 2023, marking another major medical marijuana victory in a conservative state.
Ohio’s approval was especially notable because it showed that adult-use legalization could win in a state that had rejected legalization less than a decade earlier. It also brought the number of adult-use legalization states to 24.
2024-2026: The Modern Legalization Landscape
2024
Nebraska voters approved a pair of medical marijuana initiatives in 2024, one legalizing medical marijuana and the other establishing a regulatory framework for the industry.
The year also showed the limits of the legalization movement. Adult-use measures failed in several states, and Florida’s adult-use legalization initiative received majority support but fell short of the 60% threshold required for passage.
Even so, Nebraska’s vote demonstrated that medical marijuana continued to advance in states without existing comprehensive programs.
2025
By 2025, the map of marijuana legalization had largely taken its modern shape, with comprehensive medical marijuana laws in a large majority of states and adult-use legalization covering nearly half the country.
Texas expanded and revised its medical marijuana system through legislation, while other states continued adjusting existing programs, tightening hemp rules, expanding qualifying conditions, launching new licensing rounds and debating how to regulate intoxicating hemp products.
Although no new adult-use state joined the list in 2025, the year reflected a broader trend: Legalization was increasingly becoming less about passing first-time laws and more about managing mature markets.
2026
In 2026, the federal government took some of its most significant marijuana-related actions in decades.
On April 23, the Department of Justice and DEA announced an order placing FDA-approved marijuana products and marijuana products subject to qualifying state-issued medical marijuana licenses into Schedule III of the Controlled Substances Act. Marijuana outside those categories remained in Schedule I while the federal government continued a separate proceeding over broader rescheduling.
The DEA administrative hearing on moving marijuana more broadly from Schedule I to Schedule III began June 29 and concluded July 15 after 11 days of proceedings.
Following the hearing, the federal government filed its post-hearing brief on August 17 and formally urged Chief Administrative Law Judge Derek Julius to recommend Schedule III, arguing that marijuana no longer meets the statutory requirements for Schedule I.
The case remains pending. Julius is expected to issue a recommended decision, which will not itself constitute the final scheduling action. The administrative record will ultimately go to DEA Administrator Terry Cole for the agency’s final determination.
DEA’s hearing materials, including the corrected transcript order, are available here.
Georgia also enacted SB 220 in 2026, replacing its previous low-THC program and moving the state into a more formal medical marijuana framework.
Virginia, meanwhile, finally approved legislation creating a regulated recreational marijuana marketplace, five years after legalizing possession. Under the new law, retail marijuana sales are scheduled to begin July 1, 2027, with license applications opening February 1, 2027.
As of September 2026, 41 states have comprehensive medical marijuana laws, while several additional states maintain more limited low-THC or CBD programs. Twenty-four states have legalized marijuana possession for adults, while Washington, D.C., also allows adult possession and home cultivation. Three U.S. territories also allow or regulate adult-use marijuana.
The history of marijuana legalization in the United States has therefore unfolded in stages rather than through a single national change: decriminalization beginning in the 1970s, medical legalization beginning in the 1990s, adult-use legalization beginning in 2012, the spread of regulated commercial markets, and more recent changes to federal marijuana policy.
A breakdown of local and statewide marijuana reform measures and key political races voters will decide during the 2026 election can be found by clicking here.
