one other thought crossed my mind ... with the cool temps.. germination may be delayed ...

e.g if the seed should germ in 14 days.. in 72 degree soil ... well ... it isnt going to happen until then ...

ken

We have pepper seed in planters set over the heating vent germinate sooner than do those set in a somewhat cooler part of the room.

✔

I'm in your zone and state (middle TN here). I have annuals that despise being cold already planted out, including marigold (zinnias, sunflower, and even a tomato, all plants, not just seeds), and they're doing fine. We got cold, but not cold enough to stop them. You'll be fine. Heck, the California desert plants are even surviving.

As others have commented, I wouldn't worry. If you just planted seeds, they will not have germinated yet and so should be unaffected.

Marigolds and snapdragons especially are cold/frost tolerant anyway.

As long as they are under the ground they won't freeze with a light frost. Snaps especially will be fine because that's just the weather they prefer. I've had them winter over and had dropped seeds sprout and grow in that kind of weather. Marigolds are not quite as hardy but they should be fine too

I bet they sprout this week with the amount of rain we've had and then we will have a lot of sun.

Yes they have started sprouting! ☺️ Of course only 30% of the seeds I planted have sprouted but maybe in a few days more will sprout. I am happy with that amount. In the future I will either plant later, sow in waves, or sow indoors first. Isn't gardening fun?

It is fun. I came here first thing to see how it was going for you. You got the timing right this time. What I've learned is, there are plants that actually do better with earlier sowing (petunias, calendula, matthiola... I could go on), and some that would rather wait, but even then, do fine even with low 40/upper 30 degree weather. Happy growing!