My broccoli croaked;
it survived the first few bitterly cold nights, but the cumulative effect must have been too much.

You might try watering it thoroughly & covering it with several layers (ie, leaves or hay or sheets, then upturned buckets).

My broccoli bit the dust as well.

same question but I am a little late. It is supposed to get down to 20 tonight and I still have around a dozen or so broccoli plants that the main crowns will be ready in about a week or two. Should I harvest tonight or will they be ok?

a little late, but I've noticed that the sole cauliflower that I didn't cover for the freeze survived it fine. The temperatures got down to 23 degrees Friday night/Saturday morning.

Can frost cloth double for row covers for keeping out insects? According to this source they can, but heavier weights let in less light. Do you know what weight you are using, and also where it might available locally?

Thank you!

Here is a link that might be useful: Frost and Insect Covers ..