What I've been doing is a nice walk in the morning (kids stay clean and mud free) and then we do our outside play for the last 45-30 minutes of the day after picking up my son from the bus. The parents like outside pick-up too because it is faster and easier as they don't have to come in and wrestle their child into jackets, boots, etc. The kids still get some fresh air in the morning without the mess. Once things dry out, we will play outside morning and afternoon.