Will marigold seeds harvested after a couple of cold snaps (one night, 24 F, a couple about 29 F) be viable for planting next year? And, should they be stored in the pod, or pulled out and they stored?
The best time to harvest any seed is when it has dried out on the plant, and then it can be stored in a paper container (bag or envelope) either in or out of the pod. If the seeds have been left out in cold wet weather, they might well have become wet and rotten. If this is the case you might as well forget it this time and collect seed next year instead.