My 5th grade son wanted to hatch chicks for a science project. He needed a Hypothesis so we came up with; "Refrigeration of fertile chicken eggs will decrease but not eliminate the viability of fertile eggs". We then got 2 dozen eggs from the 4H, 1 dozen from Trader Joe's, and 1 dozen from Whole Foods. When I was at Trader Joe's I got what was on the shelf. Couldn't find the fertile eggs at Whole Foods so I asked for help. Ended up asking the guy to check the back for the freshest he had. The date on the eggs from WF was 6 days fresher than TJ's. We were told by the 4H that we would get a 50 to 60% hatch rate. From TJ's we only hatched 1 of the 12. From Whole Foods we got 8! out of 12. From the 2 doz 4H eggs we only got 10 (3 more developed but failed to hatch). We also had 1 more from WH and another from 4H that I did eggtopsy's on and determined the chicks were so large in the shell they couldn't turn to completely zipper the egg. If I had assisted just a little I think they would have survived. It was my first time hatching and I learned a lot. If I were you I would definitely not give up on Whole Foods; just ask them when they'll get a shipment in and get the freshest eggs you can. Let them warm up for 12 hours or so before putting them in your bator and keep a close eye on the humidity as well as the temp. We found the temp to stay very constant but the humidity to be much more variable. I also learned that eggs layed in the spring and fall are more likely to be fertile than the summer or winter. Good Luck.