It would be best to use the flour within one year, if frozen. It won't necessarily spoil if held longer, but it can pick up flavors from the freezer or may even turn rancid, depending upon the type of flour.
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Self-rising flour is nothing more than all purpose flour combined with salt and baking powder and will keep quite a long time. However, since baking powder loses effectiveness over time, self-rising flour is only useful if the baking powder is still active.
Packages of self-rising flour should have 'best if used by' dates printed on the label. The flour may still perform as expected after that date, but the longer you go past it the more you risk baked goods not rising properly.
About 10 to 15 months if kept in an air tight container in a cool, dry, dark place with temperature under 75 degrees.
Keep self raising flower in a cool and dry space. Keep it in a plastic bag or sealed container to prevent potential infestations.