How cold is too cold?

How cold is too cold?

So I know people wait until after the last frost date to move their vegetable seedlings outside. The last frost date in my area is scheduled for May 24 - 28 depending on what resource you check. It has been a warm spring, but we still have cool nights (anywhere from 34 - 40 degrees). The days are warmer and I'm anxious to get my strong looking seedlings out of the house. What temperature do you think vegetable plants can make it in? If these were your vegetable plants, what night low temperature would you wait to be above? I have beans, squash, peppers, cucumbers, and tomatoes.
Tomato Hornworm & Mystery Plant

Tomato Hornworm & Mystery Plant

Flower ID?

Flower ID?

A matter of curtains.

A matter of curtains.

Wild plant ID?

Wild plant ID?

The branch is thinned out slowly.

The branch is thinned out slowly.

Give us tree!

Give us tree!