2017 appears to be a warmer year than normal. I have always heard that the best time to apply a crabgrass preventer is when the lilacs are blooming. I don't have a ground thermometer so I can only go with our daily temperatures. I live in Scandia which is in the northern most part of Washington County. When do you recommend I apply the crabgrass preventer? Thank you!
Washington County Minnesota crabgrass preemergent
The University of Michigan has a great site that can help you. It shows you are just entering the time to use a pre-emergent crabgrass preventer. See: http://www.gddtracker.net/?model=7&offset=0&zip=55073