Scone mix is simply homemade Bisquick by any other name, and it consists of flour, sugar, salt, leavening in the form of soda or baking powder with fat either in the form of oil, or in a hard fat like lard or shortening or butter.
The freezing keeps the fats fresh.
The only problem you could run into is that if you use a fat with some water content, your baking powder could be dampened and lose some of it's fizz power as it sits.
If you use a low or no water fat, you should be fine for quite a long time in the freezer.
And it is a GREAT way to keep it all fresh and bug free too.
Go ahead, just make sure it's air tight, and stuff like that I usually recommend a double bag, put the mix in a good ziplock, and use a grocery bag on top to corral the mixes together but also to keep freezer odour out.
With biscuit or scone mix, its very mild flavour anyway and tends to pick up odours easily.
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