Too early they will sprout and then freeze unless you can cover the pot or bring it inside when it gets below freezing.
Marigolds planted in ground will come up when the temperature is right .
Nasturtiums can be started inside in a cup then planted out after frost freeze is past
If you have plenty seeds you can try some in the pot around April 15 and see what happens , replant if they get froze off.
Good luck and Great gardening
