Hello!

My tomatoes plants have frostbite from the 34-degree weather this morning and the leaves are wilting. What is the chance that my tomato plants live? How can I make a higher chance of them growing longer and living longer?

younggardengrower
Sadly, tomatoes are hot-weather crops and won't survive outdoors in your current weather unless you have a heated greenhouse. They need at least 8 hours of sun a day and temperatures between 55° and 85°F. You can start new plants indoors in a couple of months (maybe earlier in your hardiness zone). Come visit our Tomato Gardening thread for further 'mater discussions!
https://garden.org/thread/go/1...

I have known them to come back from near-freezing and near-dehydration, once the conditions improve substantially. But they do need that heat and light to be of any use.

They will probably live unless they were very thirsty at the time. I've had them survive below 32 degrees easily.

Tomatoes are generally grown as annuals, unless you have a way to keep them warm through the winter--even in the low desert. Yours might survive, but you might think about planting a new one when the weather's a little warmer.
The Phoenix area basically has two short growing seasons--Spring and Fall. It's too cold in Winter and too hot in Summer. So, your Cooperative Extension recommends putting out tomato transplants in early March for an early summer crop.
There are a number of other vegetables that do very well through the Winter, even if there is cold and frost. Kale, lettuce and cabbage come to mind, I'm sure there are others. They'll fade away when it gets hot, but do just fine through the winter.
Here's a link to some information you might find helpful:
https://extension.arizona.edu/...