Iowa Morels tend to pop up a week or two after the first frost. Some say the best time to start looking is tax day, which is April 15. I would say the apr 20-Jun-05 is the best time to look. In the Quad Cities though it's hard to say, that's more eastern Iowa, and I'm in Central Iowa right near the state capital. I find them here April 20-May-31st. Always check the soil temps, and the forecast. Usually after five days of 65-70 degree weather with no frost is the best time to go, and with the Mississippi river right there shouldn't be to hard. Good luck and welcome to Iowa.