Will a misdemeanor conviction show up on a background check in NY?

In my experience yes, unless you ask for a deferred judgment at the time of your trial (in Iowa you have to ask at the time of your trial in order for them to be expunged or erased from your criminal history). In other states you can pay after your trial or sentencing to get your records expunged but it may be a certain amount of time I'm not sure.

I was informed only certain felonies and misdemeanors can be expunged. Most juvenile records are expunged or expungable. I was also informed that most agencies can not release any negative information that is 7 years or older. Some companies only go back 5 years. Some marijuana charges can not be exposed if more than 2 years old in certain states.

I say google a lot of information, ask your local legal aide ( you can look up the number) Workforce centers or job services usually have some information.