Keep the carrots well watered. They prefer cooler temperatures for sprouting. They are usually planted "as soon as the ground can be worked." So they may or may not sprout for you planted in 90 deg heat.
We have cooled down now! We were gifted with 1.6" of rain Monday night and more rain Tuesday night! Perfect to get those seeds started in the right direction! We've cooled down to more seasonal weather, 38 degrees last night and in the 60's during the day.