Answer: Absolutely! I have heard they are one of the best beans for freezing. I haven't done it myself before, because I never grown enough beans where I couldn't eat them all fresh (hopefully this year will change that!). I would recommend blanching them before freezing. Just bring a pot of water to a boil, drop the beans in and cook for 2-3 minutes. Then quickly put the beans into a bowl of ice water to shock them and stop the cooking. This will preserve a bright green color. Then for freezing, I recommend placing each bean individually, without touching another on a cookie sheet or sheet pan lined with parchment paper. Then place into the freezer making sure the cookie sheet is flat. Once the beans freeze, then place them into a zip top bag. I like doing this because it's less likely your beans are going to all stick together, so it's easier to pull some of the beans out of the bag if you aren't going to use them all at once.
For more on blue lake bush beans, click here to read all my posts on them.