Hi Mark, welcome to permies! I stratified butternut seeds in the fridge and they sprouted. My hunch is that refrigerator is cold enough since in many places with snow cover, the ground doesn't actually freeze. Especially at the depth squirrels plant the seeds. I'm also guessing it's dependent upon the species. What are you planning to grow?
"Hundreds of years from now it will not matter what my bank account was, the sort of house I lived in or the type of car I drove... But the world may be different because I did something so bafflingly crazy that it becomes a tourist destination"
I'm so happy! And I wish to make this tiny ad happy too: