Sometimes when it's too cold to go outside, you have to bring the elements in! My two year old is obsessed with trucks and has been for a long time. We used a square sensory bin to make a snow site and added in various sized construction vehicles.
To engage my younger toddler, 1 year old, I added in stacking cups in various sizes to fill and dump to create snow castles and boxes.
One thing that's great to focus on for this activity is filling and dumping. And if you have a toddler, you know that they love dumping. The cups provide a productive way to fill that's fun for all ages.
Quarantine was rough for us and a major factor was the fact that there was a newborn at home. With any newborn, there's a feeling of being stuck and not being able to go wherever you want. You're very much strapped down to a feeding and sleeping schedule, rinse and repeat. Despite the collic and endless wakings at night, I really found my footing in this mom of two being stuck at home life by getting outside.
March in New England is still cold. It snows sometimes, is generally wet, and really not a great experience if you didn't have to go out. But once I made it a part of my daily routine to get outside in same way, shape, or form, my mood change and my mindset lifted.