Krakatoa,
You will need to verify the circumstances for each field you will need to play at. Do NOT take anyone's word for it. Always verify with the host team or responsible organization. You may even want to call the city/town offices (if the field maintenance is a city task) just to make sure.
Here in NH, most every field in HS and Legion ball is real grass. Manchester however has two Legion posts and a couple of HS teams that play at Gil Stadium. The state Legion tournament is also played there. That stadium had an artificial surface laid down a couple of years ago primarily for football. The first year communication was not good, so during the HS season, they allowed players to use metal spikes. The company that laid down the field had to make some repairs, and then informed the city that the warranty would voided if one more player went on the field with metal cleats.
We had to find turf cleats for our son with less than two weeks notice. Not fun for what was then a size 15 foot!
Just double check, or even better, get him the shoes that have the removable cleats. Then you can just change them over when you need to.
