Do marijuana rules differ by state?

Yes. Cannabis legality for travelers Crosstatelaws maps all 50 states for travelers who are physically in that state — not for what a state requires of its own plates or licenses.

Does marijuana apply if my vehicle is registered in another state?

Operate-here rules (speed, helmets, possession, inspections you must stop for) follow the state you are in. Registration-state rules such as a front license plate do not. Read the layer notes on the map.

Where can I see a marijuana map?

Open the Crosstatelaws interactive map with this layer soloed: https://crosstatelaws.com/?solo=marijuana

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Marijuana laws by state

People search “Marijuana by state”, “Marijuana laws by state”, and “Cannabis map” when a road trip, boat, bike, or load is about to cross a line. This page is the 50-state index for marijuana. Colors and quotes are written for someone in that state today, not for what that state demands of its own registered vehicles.

Open the Cannabis difference map

How states differ

Cannabis legality for travelers.

Adult-use legal (state law; federal risk remains)
Medical only — visitor recreational illegal
Recreational illegal

Searches this page is meant to answer

If you typed any of these — or a close variant with a state name — this is the Crosstatelaws topic that should show up:

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All 50 states

One-line traveler summary for each state. Open the map for the quoted rule and footnotes.

Alabama (AL): Alabama: medical only — no published visitor recreational ounce; Darren Wesley ‘Ato’ Hall Compassion Act card required. Visitor recreational possession is a crime.
Alaska (AK): Alaska: adult-use legal — 1 oz (28 g) on person (AS 17.38.020). 21+. Federal law still bans cannabis on federal property and across state lines (21 U.S.C. § 841 / 844).
Arizona (AZ): Arizona: adult-use legal — 1 oz (28 g) flower; 5 g concentrate (A.R.S. § 36-2852). 21+. Federal law still bans cannabis on federal property and across state lines (21 U.S.C. § 841 / 844).
Arkansas (AR): Arkansas: medical only — qualifying patient card; no visitor rec ounce. Visitor recreational possession is a crime.
California (CA): California: adult-use legal — 28.5 g (1 oz) flower; 8 g concentrate (H&S § 11362.1). 21+. Federal law still bans cannabis on federal property and across state lines (21 U.S.C. § 841 / 844).
Colorado (CO): Colorado: adult-use legal — 1 oz (28 g) in public (Colo. Const. art. XVIII, § 16). 21+. Federal law still bans cannabis on federal property and across state lines (21 U.S.C. § 841 / 844).
Connecticut (CT): Connecticut: adult-use legal — 1.5 oz on person; 5 oz locked at home (P.A. 21-1). 21+. Federal law still bans cannabis on federal property and across state lines (21 U.S.C. § 841 / 844).
Delaware (DE): Delaware: adult-use legal — 1 oz flower (16 Del. C. § 4764A). 21+. Federal law still bans cannabis on federal property and across state lines (21 U.S.C. § 841 / 844).
Florida (FL): Florida: medical only — MMTC / qualified-patient card; no rec ounce. Visitor recreational possession is a crime.
Georgia (GA): Georgia: recreational marijuana illegal — low-THC oil registry only (≤5% THC); no rec flower ounce.
Hawaii (HI): Hawaii: medical only — 329 card; no visitor rec ounce. Visitor recreational possession is a crime.
Idaho (ID): Idaho: recreational marijuana illegal — no published rec or medical flower program; any amount is a crime.
Illinois (IL): Illinois: adult-use legal — 30 g flower / 5 g concentrate / 500 mg THC in products (410 ILCS 705/10-10). 21+. Federal law still bans cannabis on federal property and across state lines (21 U.S.C. § 841 / 844).
Indiana (IN): Indiana: recreational marijuana illegal — no published rec ounce; CBD/low-THC is not flower.
Iowa (IA): Iowa: medical only — medical cannabis / low-THC program; no rec ounce. Visitor recreational possession is a crime.
Kansas (KS): Kansas: recreational marijuana illegal — no published rec or medical flower ounce.
Kentucky (KY): Kentucky: medical only — medical cannabis program; no rec ounce. Visitor recreational possession is a crime.
Louisiana (LA): Louisiana: medical only — medical marijuana program; no rec ounce. Visitor recreational possession is a crime.
Maine (ME): Maine: adult-use legal — 2.5 oz (28-B M.R.S. § 1501). 21+. Federal law still bans cannabis on federal property and across state lines (21 U.S.C. § 841 / 844).
Maryland (MD): Maryland: adult-use legal — 1.5 oz flower (Md. Code, Crim. Law § 5-601 / Alcoholic Bev. § 36-1102). 21+. Federal law still bans cannabis on federal property and across state lines (21 U.S.C. § 841 / 844).
Massachusetts (MA): Massachusetts: adult-use legal — 1 oz (28 g) in public (ch. 94G, § 7). 21+. Federal law still bans cannabis on federal property and across state lines (21 U.S.C. § 841 / 844).
Michigan (MI): Michigan: adult-use legal — 2.5 oz (MCL 333.27955). 21+. Federal law still bans cannabis on federal property and across state lines (21 U.S.C. § 841 / 844).
Minnesota (MN): Minnesota: adult-use legal — 2 oz flower in public (Minn. Stat. § 342.09). 21+. Federal law still bans cannabis on federal property and across state lines (21 U.S.C. § 841 / 844).
Mississippi (MS): Mississippi: medical only — medical cannabis; no rec ounce. Visitor recreational possession is a crime.
Missouri (MO): Missouri: adult-use legal — 3 oz (Mo. Rev. Stat. § 195.805 / Art. XIV). 21+. Federal law still bans cannabis on federal property and across state lines (21 U.S.C. § 841 / 844).
Montana (MT): Montana: adult-use legal — 1 oz (Mont. Code § 16-12-106). 21+. Federal law still bans cannabis on federal property and across state lines (21 U.S.C. § 841 / 844).
Nebraska (NE): Nebraska: recreational marijuana illegal — no published rec flower ounce; medical program implementation is not a visitor rec pass.
Nevada (NV): Nevada: adult-use legal — 1 oz (28 g) / 3.5 g concentrate (NRS 678D.200). 21+. Federal law still bans cannabis on federal property and across state lines (21 U.S.C. § 841 / 844).
New Hampshire (NH): New Hampshire: medical only — medical cannabis (therapeutic); no rec ounce. Visitor recreational possession is a crime.
New Jersey (NJ): New Jersey: adult-use legal — 6 oz (N.J.S.A. 24:6I-31 / CREAMMA). 21+. Federal law still bans cannabis on federal property and across state lines (21 U.S.C. § 841 / 844).
New Mexico (NM): New Mexico: adult-use legal — 2 oz (N.M. Stat. § 26-2C-25). 21+. Federal law still bans cannabis on federal property and across state lines (21 U.S.C. § 841 / 844).
New York (NY): New York: adult-use legal — 3 oz flower (Penal Law § 222.05 / MRTA). 21+. Federal law still bans cannabis on federal property and across state lines (21 U.S.C. § 841 / 844).
North Carolina (NC): North Carolina: recreational marijuana illegal — no published rec flower ounce; hemp ≠ marijuana.
North Dakota (ND): North Dakota: medical only — medical marijuana; no rec ounce. Visitor recreational possession is a crime.
Ohio (OH): Ohio: adult-use legal — 2.5 oz (Ohio Rev. Code § 3780.36). 21+. Federal law still bans cannabis on federal property and across state lines (21 U.S.C. § 841 / 844).
Oklahoma (OK): Oklahoma: medical only — medical marijuana (OMMA card); no rec ounce. Visitor recreational possession is a crime.
Oregon (OR): Oregon: adult-use legal — 1 oz in public; 8 oz at home (ORS 475C.337). 21+. Federal law still bans cannabis on federal property and across state lines (21 U.S.C. § 841 / 844).
Pennsylvania (PA): Pennsylvania: medical only — medical marijuana card; no rec ounce. Visitor recreational possession is a crime.
Rhode Island (RI): Rhode Island: adult-use legal — 1 oz (R.I. Gen. Laws § 21-28.11-4). 21+. Federal law still bans cannabis on federal property and across state lines (21 U.S.C. § 841 / 844).
South Carolina (SC): South Carolina: recreational marijuana illegal — no published rec flower ounce.
South Dakota (SD): South Dakota: medical only — medical cannabis; no rec ounce. Visitor recreational possession is a crime.
Tennessee (TN): Tennessee: recreational marijuana illegal — no published rec flower ounce.
Texas (TX): Texas: recreational marijuana illegal — Compassionate Use low-THC only; no rec flower ounce.
Utah (UT): Utah: medical only — medical cannabis card; no rec ounce. Visitor recreational possession is a crime.
Vermont (VT): Vermont: adult-use legal — 1 oz (18 V.S.A. § 4230a). 21+. Federal law still bans cannabis on federal property and across state lines (21 U.S.C. § 841 / 844).
Virginia (VA): Virginia: adult-use legal — 1 oz (Va. Code § 4.1-1100). 21+. Federal law still bans cannabis on federal property and across state lines (21 U.S.C. § 841 / 844).
Washington (WA): Washington: adult-use legal — 1 oz flower (RCW 69.50.4013 / 69.50.360). 21+. Federal law still bans cannabis on federal property and across state lines (21 U.S.C. § 841 / 844).
West Virginia (WV): West Virginia: medical only — medical cannabis; no rec ounce. Visitor recreational possession is a crime.
Wisconsin (WI): Wisconsin: recreational marijuana illegal — no published rec flower ounce; CBD is not flower.
Wyoming (WY): Wyoming: recreational marijuana illegal — no published rec flower ounce.

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Not legal advice. Confirm statutes before you travel. Disclaimer.