You might try washing and drying those underripe ones and putting in a plastic bag, not sealed in the fridge. They should hold til you get back.
I actually just got in from covering everything up.
The low tonight is supposed to be 39, which is colder than last night, and it supposed to be clear, so the chance of frost is higher.
So I dragged out the floating row covers and a bunch of old bedsheets and stuff, and some cardboard, and just laid it all over the plants.
Aside from the squash, I have peppers and green beans to protect. I got all those covered. I have too many tomatoes to cover, so picked anything with any color to it and brought those inside. The tomato plants will just have to take their chances. Besides, I’ve already canned about 35 quarts of sauce.