My slicing cucumbers are taking forever too, I think that is normal. I have six pickling cucumbers, but they are in an earthbox and that thing is insane! Do you notice any female flowers on your plants? I have six squash plants (3 varieties) and I have tons of flowers, but they are all male. Sometimes the plants go through cycles of males before the females come out. I have to hand pollinate mine because they are under row covers. Hopefully yours are just slow to get a move on like mine, good luck!

I'm not a big fan of square foot gardening.

Can you post a picture of the cukes and squash?

Use potassium on cucumbers. They need it to start producing.

That's an important point about male and female flowers. Squash and cukes will start out producing only the former, because they are easier for the plant to make, and they'll attract pollinators to the bed. Once that attraction is done, the plants start spitting out females as well. If you have both, but no fruit, you might try some hand pollination. You may not have insect pollinators around. Hand pollination is a little laborious with the small cuke flowers, but should be really easy to do with the squash.

Now, some cuke hybrids are gynoecious, in that males don't happen on the plant. Seed packages of such cukes usually have dye-marked monoecious seeds that offer those males. I think those gynoecious hybrids are supposed to be able to fruit by themselves (producing seedless fruit), but I'm not aware that it really works that well.

I'd be careful about fertilizing. There is no "magic sauce" for fruiting, unless the soil is recognizably deficient in something. If this is your first year gardening, you'd do well to get a soil test, or see what your neighbors got when they did it. If you had a potassium deficiency, you'd probably see leaf-cupping on older leaves and leaf scorching. Such deficiency is more common in acid soils. Too much potassium will encourage foliage development, like for nitrogen excess.

Some fruit bearing depends on temperature, and there's nothing we can do about that. Be patient. Like a previous poster said, the first squash flowers are usually male. Female flowers will show up later. My cucumber is producing like crazy, but the early season flowers just fell off.