This is a timeline of women's suffrage in Colorado. Women's suffrage efforts started in the late 1860s. During the state constitutional convention for Colorado, women received a small win when they were granted the right to vote in school board elections. In 1877, the first women's suffrage referendum was defeated. In 1893, another referendum was successful. After winning the right to vote, Colorado women continued to fight for a federal women's suffrage amendment. While most women were able to vote, it wasn't until 1970 that Native Americans living on reservations were enfranchised.