- Michigan grow guide · Updated November 12, 2026
Marijuana Seeds in Michigan
Adults 21 and over in Michigan can grow up to 12 cannabis plants at home, and no more than 12 per residence however many adults live there. Plants must be in an enclosed, locked area that can’t be seen from a public place, and no permit is needed. Up north, frost can come as late as mid June and as early as September, so autoflowers and fast-flowering strains are the safer choice.
- Legal age
- 21+
- Plants per adult
- 12
- Plants per home
- 12
- Permit needed
- No
- Keep at home
- 10 oz plus your harvest
- Plant out
- Late April to mid June
- USDA zones
- 4a–6b
Michigan home-grow rules
What adults 21 and over may grow and keep under the Michigan Regulation and Taxation of Marihuana Act (MCL 333.27955). These limits haven’t changed in 2025 or 2026.
| Who can grow | Adults 21 and over, within their residence. |
|---|---|
| Plants per adult | Up to 12. |
| Plants per home | No more than 12 on the premises at once, however many adults live there. |
| Where plants must be kept | In an enclosed area with locks or other working security devices, and not visible from a public place without binoculars, aircraft or other optical aids. The same rules apply indoors and outdoors. |
| Permit or registration | None. |
| What you can keep | Up to 2.5 ounces in public, no more than 15 grams of it concentrate. At home, up to 10 ounces plus everything your plants produce; anything over 2.5 ounces must be locked up. |
| Extraction | No butane extraction, or extraction with any substance with a flashpoint below 100°F, at home. |
| Gifting | You may give up to 2.5 ounces to an adult 21+, with no payment and no public advertising. Selling homegrown cannabis isn’t protected. |
| Landlords and property owners | May ban or regulate growing on property they own or manage. |
| Local rules | Towns may ban or cap marijuana businesses. The Act’s list of local powers doesn’t mention home growing. |
| Medical patients | Registered patients may keep 12 plants in an enclosed, locked facility, and caregivers may grow 12 per patient for up to 5 patients. |
| Regulator | Cannabis Regulatory Agency |
Growing cannabis outdoors in Michigan
Michigan’s season runs from about May to mid October in the southern Lower Peninsula but can be under four months in the Upper Peninsula, so where you live decides what you plant.
Plant out
After your zone’s last frost: late April in the warmest southern pockets, early to mid May across most of the southern Lower Peninsula, late May in zones 5a–5b, and late May to mid June in the UP.
Flowering
Photoperiod plants flower as days shorten. Michigan State University’s UP hemp trials expected flowering from about late August, when days fall to about 14 hours.
Harvest
Most photoperiod plants finish from late September into October. Plan around your first frost: early to late September in the UP and far north, October in the south.
What to watch for in Michigan
- A short northern season. In zones 4a–5a frost can last into June and return in September.
- Late-flowering strains may not finish. MSU’s hemp trials found the latest-flowering cultivars poorly suited to Michigan.
- Bud rot (gray mold) in damp autumn weather, and slow drying after harvest.
- Heavier downpours. 2-inch rain events have become more frequent in Michigan since the early 2000s.
- Spring freeze swings. A warm April can be followed by a hard freeze, so don’t plant out early.
How Michigan’s regions differ
The southern Lower Peninsula (zones 6a–6b) has the longest season, roughly May to mid October, and the Lake Michigan shore runs milder than inland areas. The northern Lower Peninsula and the UP (zones 4a–5b) can see frost into late May or June and again from September, and the UP averages about 10°F cooler than the far south.
Strains that suit Michigan
Chosen by how long each strain takes, using Beaver Seeds’ researched strain data: autoflowers for short northern seasons and quick-flowering feminized strains for the south.
- Northern Lights Auto: seed to harvest in about 9–12 weeks without waiting for shorter days. A late-May start can finish in August, ahead of northern frost.
- Gelato Auto: seed to harvest in about 9–11 weeks, small enough to fit between late spring frost and early fall up north.
- Chocolate Chunk: flowers in about 7–8 weeks, so southern growers can harvest before October rain sets in.
- Gorilla Glue: flowers in about 8–9 weeks, a fit for the southern Lower Peninsula’s October first-frost window.
Buying marijuana seeds in Michigan
How Beaver Seeds orders reach Michigan, and what state law says about buying seeds there.
Shipped from our US warehouse
US orders ship by USPS in plain, unbranded packaging. Priority Mail usually arrives in 3–7 days and Ground Advantage in 3–14 days. Shipping is free over $200.
Buy 1, get 1 free
Buy a 10 or 25 seed pack and get a second pack of the same size free, in any strain. 5-seed packs come with 1 extra seed.
80% germination guarantee
Every pack is covered. If your seeds don’t sprout as they should, contact our support team with your order number and we’ll help.
Michigan’s rules let licensed marijuana retailers sell adults up to 3 immature plants (clones) per transaction. The Cannabis Regulatory Agency hasn’t published a rule that clearly allows or bans retail seed sales, or one on buying seeds from out of state.
Michigan grow FAQ
Short answers to the questions Michigan growers ask most.
Is it legal to grow marijuana at home in Michigan?
Yes. Since December 6, 2018, adults 21 and over may grow up to 12 plants in their residence, in an enclosed, locked area that can’t be seen from a public place. No permit is needed.
How many plants can I grow in Michigan?
Up to 12, and no more than 12 per residence however many adults live there. Medical patients and caregivers have separate limits under the Michigan Medical Marihuana Act.
Can I grow cannabis outside in Michigan?
Yes. The same rules apply outdoors: an enclosed area with locks or other security devices, not visible from a public place without binoculars, aircraft or other optical aids.
How much homegrown cannabis can I keep in Michigan?
Up to 10 ounces at home plus everything your plants produce, with anything over 2.5 ounces locked up. In public the limit is 2.5 ounces, no more than 15 grams of it concentrate.
When should I plant cannabis outdoors in Michigan?
After your last frost: early to mid May in most of the southern Lower Peninsula, late May in zones 5a–5b and late May to mid June in the UP. A warm April can still be followed by a freeze.
Sources
- Controlled Substances Benchbook § 8.14, scope of the MRTMA (Michigan Supreme Court, Michigan Judicial Institute)
- Ballot Proposal 18-1: an overview (Michigan Senate Fiscal Agency)
- Michigan Regulation and Taxation of Marihuana Act (Cannabis Regulatory Agency)
- Mich. Admin. Code R 420.506, purchasing limits (Michigan Administrative Code)
- MCL 333.26426, medical marihuana (Michigan Legislature)
- Lower Peninsula garden planning calendar (Michigan State University Extension)
- Upper Peninsula gardening calendar (Michigan State University Extension)
- Industrial Hemp Production in Michigan (E3402) (Michigan State University Extension)
- Michigan State Climate Summary 2025 (NOAA NCEI / NC Institute for Climate Studies)
- 2023 Plant Hardiness Zone Map: Michigan (USDA Agricultural Research Service)
Checked November 12, 2026. This page is a plain-language summary of Michigan law, not legal advice. Laws change, so check the official sources before you grow.