My favorite place to visit is Uesugi Farms (on Yelp). They have lots of pumpkins to choose from and many activities to choose from. This is where we went the last two years.
But this is not the only place. Here are a few other places for pumpkins:
- Webb Ranch Farm in Portola Valley.
- Spina Farms Pumpkin Patch in San Jose.
- Art and Pumpkin Festival in Half Moon Bay.
- G&M Farms in Livermore.
- Joan's Farm in Livermore.
Here's a map of those places:
You can see a really comprehensive list here.