There are many things to consider to assure you're getting the best plant for your location. Here is a checklist of things to consider. Make sure we are past the last frost date for your area. That varies greatly across our region. There are warm and cold pockets that will determine when you should plant.
Urban areas are always warmer than the countryside.
Lakeside is cooler in the spring, but may also be frost-free sooner. As a general rule, mid May is our typical last frost. That is when soil temperatures allow for root development and maximum plant growth. When you are at the garden center look for well watered plants. Touch the soil with your finger to see if it is moist.