Only time will tell. Sweet peas are fairly tolerant to mild frost. I’m guessing it will depend on the health of the seedling as to whether it can bounce back. If the roots are still OK, then the plant might be able to re-grow. If the transplants are of enough size, you might pinch off any blackened leaves/stems. Otherwise, you might just give them extra protection and care, providing as ideal growing conditions as you can, then see if they perk up again. It may take a little time, though, for them to fully recover. Good luck!
Only time will tell. Sweet peas are fairly tolerant to mild frost. I’m guessing it will depend on the health of the seedling as to whether it can bounce back. If the roots are still OK, then the plant might be able to re-grow. If the transplants are of enough size, you might pinch off any blackened leaves/stems. Otherwise, you might just give them extra protection and care, providing as ideal growing conditions as you can, then see if they perk up again. It may take a little time, though, for them to fully recover. Good luck!