A "wobbler" isn't a misdemeanor, nor is it a felony. It's both. It's a crime that prosecutors can charge, and judges can sentence, as either a misdemeanor or felony.
You won't see the word "wobbler" in the law. Rather, the law will indicate that two sentencing options exists—one that's a felony and one that's a misdemeanor. Not all states have wobbler offenses. A few of those that do include Arizona, California, and Massachusetts.
Consider, for example, California's statute regarding assault with a deadly weapon. That statute provides that an assault with such a weapon (other than a gun) can be punished by either prison time of two, three, or four years, or up to 364 days in jail. Prison time denotes a felony, while jail time indicates a misdemeanor. If the judge sentences the defendant to prison time, a felony conviction results. If the judge chooses jail time or a lesser punishment, it's a misdemeanor conviction. (Cal. Penal Code §§ 18.5, 245 (2024).)
Prosecutors generally have the choice of whether to charge a wobbler as a felony or a misdemeanor. But even when prosecutors choose one over the other, judges typically have the final say. For example, if prosecutors charge a wobbler as a felony, the judge can reduce it to a misdemeanor at sentencing.
The facts of the crime and the circumstances surrounding the offender often dictate whether prosecutors and judges go with the misdemeanor or felony label. Stabbing someone with a knife, for example, is a kind of deadly-weapon assault likely to incur a felony charge or conviction. On the other hand, swinging a wine bottle in the general direction of someone might result in a misdemeanor, particularly if the judge determines that prison time wouldn't have a rehabilitative effect.
Some states even allow judges to wait to decide whether certain crimes are misdemeanors or felonies until the defendant has completed probation.
The difference between having a felony and a misdemeanor conviction is significant—both in the short term and long term. A felony sentence can mean potential time in a state prison versus a county jail where misdemeanor sentences are served. Felonies can also result in steeper fines and longer probation terms than misdemeanors. A felony conviction often results in loss of civil rights (such as the right to vote or possess a firearm). And, if you face later criminal charges, having a prior felony on record can result in a longer sentence.
It's important to speak with a criminal defense attorney any time you face criminal charges. When faced with a wobbler, you'll want an attorney's help to make the best case for misdemeanor charges.