What is the minimum sentence for reckless endangerment?

It depends on the state. In Pennsylvania, this crime is a 2nd degree misdemeanor. The longest allowable minimum sentence for a 2nd degree misdemeanor is 1 year and the maximum is 2 years in prison. And because there is no minimum mandatory sentence for this crime, there might be no jail at all. There are many factors to consider before one can determine how much jail time for a conviction of this offense, like the nature of the crime, impact on victim, prior record of offender, etc.

18 Pa C.S.A.:§2705. Recklessly endangering another person. A person commits a misdemeanor of the second degree if he recklessly engages in conduct which places or may place another person in danger of death or serious bodily injury.