Main thing is making sure the soil they are planted in drains well. Wet feet will rot them.
You also might want to give some protection to young plants trying to get a healthy root system developed. Bright light, but not direct sun. Water in small amounts in the evening, that way the water will be gone by the next day when the heat arrives.
Never water the leaves directly during hot weather, it can fry them.
These are the things I do, but it might be different in your Denver conditions.
