If you’re completely jazzed about Shamrock Shakes, but not sure if your local McDonald’s is whipping up your favorite green treat? You need to download McDonald’s Shamrock Shake Finder App ASAP.

You can’t let  Shamrock Shake season pass without at least one (or two or three) of these. However, they’re only available until St. Patrick’s Day, which is Saturday March 17.

The Shamrock Shake Finder App is available for both iOS and Android Phones.