The only states now that let felons vote while they are incarcerated are Maine and Vermont but California felon voting may come

According to Ballot Access News:

California Assemblymember Shirley Weber introduced AB 2466 earlier this year. It would let felons vote while they are incarcerated, if they are serving their time in county jails instead of state or federal prisons. The bill passed the Assembly on May 31 and passed the Senate Elections Committee on June 22.

The California legislature is is recess but will convene in a few weeks. The only states now that let felons vote while they are incarcerated are Maine and Vermont. Most countries allow felons to vote while they are serving a sentence.

Also, from the ACLU of Northern California:

The right to vote is a fundamental right and all eligible individuals must be allowed to exercise their right. The California Constitution disenfranchises individuals on the basis of criminal conviction only if they are “imprisoned in state prison or…on parole as a result of the conviction of a felony.” League of Women Voters of California v. McPherson, 145 Cal. App. 4th 1469 at 1486 (2006).

After the passage of the Criminal Justice Realignment Act of 2011 (Realignment) the California Secretary of State’s office issued a memo stating that individuals convicted pursuant to Realignment are disenfranchised. However, the ACLU of Northern California’s legal analysis of the California Constitution, longstanding tenets of elections law, and Realignment suggests that individuals sentenced under Realignment retain the right to vote.

Despite the current uncertainty regarding voting with a felony conviction, the First District Court of Appeals decision in McPherson remains the law and clearly establishes that individuals convicted of a misdemeanor and individuals sentenced to felony probation retain the right to vote, even if confined in local jail.

The 2011 Realignment, commonly referred to as the Criminal Justice Realignment Act, includes AB 109, enacted April 4, 2011 (Stats. 2011, ch. 15.), and subsequent cleanup legislation, including AB 117, enacted June 30, 2011 (Stats. 2011, ch. 39.), and ABX1 17, enacted September 20, 2011 (Stats. 2011-2012 1st Ex. Sess., ch. 12.).