I don't go out if it is colder than -5 or if there is a windchill. This week will likely be an inside play week as the temps are supposed to be colder than -5 with a windchill in the middle teens and low twenties. My dcks are between 21mths and 4.5 years. I am not a winter person and the daycare parents know this. I have an inflatable bouncy slide that I set up in the playroom and the kids love it! I also have indoor riding toys that I bring out.