When is the Best Time to Start Planting in the Spring in the Chicago Area?
When Should You Start Planting? According to the conservatory, it's important to know the last frost date for your area before planting summer perennials and annuals. For example, they noted Chicago’s last frost date is May 15. "Of course, you should still watch the weather forecast to be sure," the conservatory says. As for the day you choose to plant, they recommend planting new annuals and perennials when it is overcast and will be cloudy or rainy the following days. "This gives the plants time to acclimate to their new home," the conservatory said. What to Do for Existing Plants...
Source: nbcchicago.com