Indiana is permissive: consumer fireworks are legal. You may use them on your own property, property you have permission to use, or a special discharge location. Local units may set hours but cannot ban protected June 29-July 9, July 4, and New Year windows.
Indiana state law (IC 22-11-14) governs consumer fireworks statewide; Lake County and its cities cannot prohibit them outright. Under IC 22-11-14-6, using them anywhere other than your own property, another's property with permission, or a designated special discharge location is a Class C infraction. Statewide default hours are 9 a.m. to 11 p.m., extended to midnight on holidays and December 31. A county or municipality may adopt an ordinance narrowing hours, but IC 22-11-14-10.5 protects certain dates: June 29-July 9 (5 p.m. to two hours after sunset), July 4 (10 a.m. to midnight), and December 31-January 1. Check your specific city (Gary, Hammond, Crown Point) for local hour limits.
Using fireworks at an unauthorized site, or after 11 p.m. (midnight on holidays/Dec 31) or before 9 a.m., is a Class C infraction; a repeat within five years is a Class C misdemeanor.
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