Tomatoes may survive 28F but it will certainly hurt them and stunt their growth. When it gets real cold I use inefficient lights and blankets over my cold frames to keep delicates alive and the temps above freezing. It's a bit of a pain but it makes a difference. I started my tomatoes valentines day and moved them out near the end of may last year. The start was a little early for my location, they got leggy long before I could move them.
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