Montana's limited adult-use authorization
The 2025 Montana Code Annotated (MCA) §16-12-106 lists certain acts that are lawful for a person age 21 or older or a registered cardholder, subject to limitations in §16-12-108. Read the current 2025 code for the full conditions; the status label "adult use" is not a blanket exception to all restrictions.
Quantities and product categories
Section 16-12-106 lists possession, purchase, use, and transport of up to 1 ounce of usable marijuana; no more than 8 grams may be concentrated, and solid edible marijuana products are limited to 800 milligrams THC. The statute includes further conduct, plant, and location limits, so do not rely on one amount alone.
Vehicle and border boundaries
Montana DOR's official Know Before You Go guidance, available as an indexed result in this check, lists vehicle storage locations such as trunk/luggage space, locked storage, or a closed container outside normal passenger areas. The page did not load directly in this pass. The indexed agency guidance says this does not authorize crossing state lines. See U.S. federal/state law basics.
Quick FAQ
What does Montana law allow an adult to possess?
The 2025 MCA §16-12-106 lists lawful personal-use acts for people 21+ or registered cardholders, including up to 1 ounce usable marijuana, with no more than 8 grams concentrated or 800 milligrams THC in solid edible products, subject to §16-12-108.
Does an amount below the limit mean every use or location is allowed?
No. The statute is subject to §16-12-108 and other laws; this summary does not authorize use at work, on federal land, or in restricted locations.
How should cannabis be stored when traveling by car in Montana?
Montana DOR's indexed guidance lists a trunk, locked storage compartment, or closed container outside normal passenger areas; direct page access timed out in this check. Its guidance concerns in-state vehicle transport, not interstate permission.
Sources
- Montana Code Annotated 2025 §16-12-106 -- directly read 2026-09-25.
- Montana DOR: Know Before You Go -- official indexed text checked 2026-09-25; direct fetch timed out in this pass.
Sources checked 2026-09-25.