Hello there! We are nearby! My kids are still young (eldest 3 1/2), but we have already looked and asked around at our local options. I did have a hard time finding large groups the further up the hill I looked. However, I recently found a large group called "Folsom Homeschoolers" that is all inclusive http://www.meetup.com/Folsom-Homeschoolers/ . We plan on joining in the fall or sooner as all my DD's friends will be starting at their preschools.
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On my hunt I did find this nice list as well:
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http://localhs.com/?page=1&ord=added&state=CA&county=Sacramento
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As for Horizon, I have only heard good things about them from the few families I have spoken to. It sounds like a public-school-at-home type of option with more freedom than the district associated umbrellas. The families I talked to had pulled their middle school children from the local school and it sounded like it was a very easy transition for them.Â