This site tracks real-time Hydrogen Fuel availability in California. With over 10,000 fuel cell cars on the road and 48 operational stations, fuel availability can be an issue. Some stations need two or more deliveries per day. Add in supplier disruptions and fueling is becomng more and more of a challenge.
Use this site to see not only stations that have fuel, but whether they are likely to still have fuel when you get there.
This site is optimized for mobile devices. You can click (touch) just about anywhere in a table to get additional information.