This list was compiled from many online and print resources; I've listed a few references for those who want more information.

1776: New Jersey gives the vote to women owning more than $250. Later the state reconsidered and women were no longer allowed to vote. (more)

1837: Kentucky gives some women suffrage in school elections. (source)

1861: Kansas enters the Union; the new state gives its women the right to vote in local school elections.

1869: Wyoming territory constitution grants women the right to vote and to hold public office.  (more more)

1870: Utah territory gives full suffrage to women. (more)

1893: The male electorate in Colorado votes "yes" on woman suffrage. (more more)

1894: Some cities in Kentucky and Ohio give women the vote in school board elections. (more)

1895: Utah amends its constitution to grant women suffrage.  (more)

1896: Idaho adopts a constitutional amendment granting suffrage to women.  (more more)

1902: Kentucky repeals limited school board election voting rights for women. (more)

1910: Washington state votes for woman suffrage.  (more more)

1911: California gives women the vote.  (more more)

1912: Male electorates in Michigan, Kansas, Oregon and Arizona approve state constitutional amendments for woman suffrage. Wisconsin defeats a proposed suffrage amendment.  (more more)

1912: Kentucky restores limited voting rights for women in school board elections. (more)

1920: On August 26, a constitutional amendment is adopted when Tennessee ratifies it, granting full woman suffrage in all states of the United States.  (more more)

1971: The United States lowers the voting age for both men and women to eighteen.