I picked HC when night temp was around 32-33 F. I kept them in a bucket in my garage. One of the nights, temp outside went down to 24 F (maybe a few degrees higher in my garage).
I have had such damage on several apples that I cut up. I don’t know if my HC were frozen on the tree or in my garage. It looks like HC does not tolerate low temp very well.
I’ve noticed that my apples that sustained extensive damage (from frozen) were those that had existing injury esp. cracking from the rain.
I think some of those cracked apples were frozen on the tree and some were frozen while in my garage.
My Korean Giant pears have had no cold-related damage. I still have a whole tree full of KG and Gold Rush. I have not picked Calville Blanc, Pink Lady, Fuji and Rubinette, either.
The general recommendation is to store apples at temperatures in low 30’s with 90% humidity, but there are a number of apple varieties that get damaged at these temps. Honeycrisp and Cortland are two that have warnings. Look up “Soggy Breakdown” or “Low Temperature Breakdown” in apples.
They have learned to SLOWLY lower the temperatures of Honeycrisp in Washington State…before putting them in cold storage. So, this apple is “exceptional” in more ways than one!!!
(Good Fruit Grower and other sources.)
While many apples are OK into the mid 20’s F
not HC. It’s not very safe at under 40.
I pack and bring a lunch to work almost every day and will often include a Honeycrisp apple if I have them. I’ve learned not to let them rest up against the ice pack as that part ends up discolored and the texture is off.