not sure on how long they last in a fridge..but they will keep for awhile..what ive done is keep them in a 10 gal lidded tub in my closet so they can breed..i feed a few to my frogs and leave some to multiply..when i get to low ill buy another 18 or so and reload the tub untill ofspring catches up i add alitttle corn mill and oatmill every so often and might go as far as to giveing them coffee grounds as a treat. check out youtube bigtexworms vids ..Liz will teach ya how to set up a bin or ill help ya ..ok gotta hop to work ..have a nice day