I was just wondering if the following seeds are viable if they have been exposed to frost for a day or two:

Nasturtium

Asclepias curassavica

Verbena bonariensis

We had our first frost last night and I didn't harvest these seeds yet since they aren't ripe.

I was hoping to trade some of these in a Round Robin at a later date, but won't do so if they aren't viable.

Thanks for any help you can give.