 Police will uphold fireworks laws in Lawrence County. Police officers want the public to be responsible and enjoy the 4th of July holiday. On July 4th, the state-allowed firework hours start at 9 a.m. and go until midnight. Fireworks can be set off any other day of the year from 9 a.m. until 11 p.m. Fireworks are legal for purchase only by those over the age of 18.