In Michigan, the amount you can store at once depends on the type of fireworks and whether you mean consumer fireworks or display-grade fireworks. Michigan law and state guidance make consumer fireworks legal to possess, but the storage limit is not stated as a simple one-size-fits-all number in the sources I found; the rules focus more on product type, explosive content, and local restrictions than on a single count limit.

What matters most

  • Consumer fireworks are legal in Michigan, including items like firecrackers, Roman candles, bottle rockets, and similar retail fireworks.
  • Michigan state guidance also distinguishes fireworks by classification and explosive content, noting that some items “may not have more than 500g of explosive mixture”.
  • Local governments can add their own restrictions on ignition, discharge, and use, so a city or township may be stricter than state law.

Practical answer

If you are asking “how many boxes can I keep in my garage or shed,” there is no simple statewide number in the sources I found. The safer reading is that legality depends on the fireworks type, how they are packaged, and whether local fire or building rules add storage limits.

What to check

  • The label on each item, especially whether it is consumer fireworks or something more heavily regulated.
  • Your city, village, or township rules, since local ordinances may be stricter.
  • Any fire code, insurance, or storage-safety limits that apply to your property.

Best next step

If you want the exact limit for your situation, the key detail is whether you mean:

  • personal storage at home, or
  • business/retail storage.

Those are treated very differently under Michigan fireworks rules.

TL;DR: Michigan does not appear to use a simple statewide “you may store X fireworks” rule in the sources I found; instead, limits depend on the fireworks type and local rules.