Agave Plants In Minnesota

Now that we are in the month of May, I am hoping to get these two Agave plants into my garden. I bought them at then end of March, but our cooler temps and rainy days just haven't allowed for me to replant them. Where I live in Minnesota, it is Zone 4 for gardening. These are rated to last through the harsh winter, but I'll need to cover them with a frost cloth. 

I purchased four cactus plants altogether from Cold Hardy Cactus. They arrived safely in the mail in small planters pots. I replanted them into these clay pots after realizing getting them outdoors was going to be a while.