You put fertilizer on the lawn and it burned the half the lawn will you need to reseed or sod in spring?

If the lawn is burnt to the point where the grass is very dry and brittle, then yes. Those areas will need to be raked up and either reseeded or sod will need to be put down. If the grass still has some green to it and gives you resistance when you pull on it, then the root system is still alive and generally water will bring it back. I work for the Scotts helpline and we get this question every now and then.