This recent archaeological find would probably NOT be accepted by most scientist in the field. Given the time frame, Neanderthals could have made it to California. But don't bet on it.
https://www.theatlantic.com/science/archive/2017/04/new-study-puts-humans-in-america-100000-years-earlier-than-expected/524301/?utm_source=yahoo&yptr=yahoo https://www.theatlantic.com/science/archive/2017/04/new-study-puts-humans-in-america-100000-years-earlier-than-expected/524301/?utm_source=yahoo&yptr=yahoo