Best time of day to plant transplants?

Question

I have milkweed and sunflowers to plant in my yard; I grew them from seed. I live in the Sacramento region of California. Thank you.

Answer 1

Morning would be a good time before the day warms up. Be sure to harden off your plants before setting them out. Here are the instructions:
https://www.gardeningknowhow.com/garden-how-to/propagation/seeds/how-to-harden-off-your-seedlings.htm