 So they are closed now tonight, but they will be open again tomorrow from 10 a.m. until 5 p.m. or until they run out. And then if you have plans to light up the sky tonight, you should know where it's legal to do so. Firework sales are legal in North Dakota through July 5th, but that doesn't mean you can use them everywhere in the state. Possessing and using fireworks is illegal within the city limits of Fargo. If you get caught, it's a $100 fine.