Also, could Stein actually win Humboldt or Mendocino counties? It probably won't happen but she will likely hit double digits there.
I doubt she will win any counties, but stranger things have happened this year. I do agree that she will hit double digits in those counties. Nader and Camejo topped out at about 16% in the early 2000's. Stein got 4.34% in 2012 in Humboldt with Rosanne Barr and Cindy Sheehan taking 0.64%. Mendocino went 2.84% Stein and 0.94% Barr in 2012. I could see Stein breaking 15% in both; 20% would be a stretch.
In the 2002 gubernatorial race, Peter Camejo got 5.26% statewide and 12.05% in Hunboldt. I looked it up a few weeks ago and Camejo actually won three precincts in Humboldt County. Camejo got 16.54% in Mendocino, but I couldn't find results by precinct that far back when I checked.