I believe there is no need to keep it in the fridge. I have been rendering and storing lard from our pigs for 3 years now. I render down the best quality fat, sieve it and pour it into warmed sterilised jars (washed in hot soapy water and dried in a low oven). The jars I have been using are old 'Bon Maman' type jam jars. Once the fat is in the jars I screw on the lids and then as the fat cools you hear the jars pop as the vacuum is created as with jam, jellies and chutney etc. I then store the jars in a cool larder (we have a workshop downstairs which is dark and cool). I have been using them through the year with no problems.